From c163bbb5dab9921323e357cc40cd015aa0ad1c67 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 11 Oct 2017 18:10:59 -0400
Subject: [PATCH] [build] 2.8.0

---
 dist/vue-router.common.js | 203 +++++++++++++++++++++++++++++---------
 dist/vue-router.esm.js    | 203 +++++++++++++++++++++++++++++---------
 dist/vue-router.js        | 203 +++++++++++++++++++++++++++++---------
 dist/vue-router.min.js    |   4 +-
 4 files changed, 467 insertions(+), 146 deletions(-)

diff --git a/dist/vue-router.common.js b/dist/vue-router.common.js
index 22b042c79..42cf1366e 100644
--- a/dist/vue-router.common.js
+++ b/dist/vue-router.common.js
@@ -1,5 +1,5 @@
 /**
-  * vue-router v2.7.0
+  * vue-router v2.8.0
   * (c) 2017 Evan You
   * @license MIT
   */
@@ -89,7 +89,7 @@ var View = {
       }
     }
 
-    // also regiseter instance in prepatch hook
+    // also register instance in prepatch hook
     // in case the same component instance is reused across different routes
     ;(data.hook || (data.hook = {})).prepatch = function (_, vnode) {
       matched.instances[name] = vnode.componentInstance;
@@ -97,6 +97,14 @@ var View = {
 
     // resolve props
     data.props = resolveProps(route, matched.props && matched.props[name]);
+    data.attrs = {};
+
+    for (var key in data.props) {
+      if (!('props' in component) || !(key in component.props)) {
+        data.attrs[key] = data.props[key];
+        delete data.props[key];
+      }
+    }
 
     return h(component, data, children)
   }
@@ -154,8 +162,7 @@ function resolveQuery (
     parsedQuery = {};
   }
   for (var key in extraQuery) {
-    var val = extraQuery[key];
-    parsedQuery[key] = Array.isArray(val) ? val.slice() : val;
+    parsedQuery[key] = extraQuery[key];
   }
   return parsedQuery
 }
@@ -232,12 +239,18 @@ function createRoute (
   router
 ) {
   var stringifyQuery$$1 = router && router.options.stringifyQuery;
+
+  var query = location.query || {};
+  try {
+    query = clone(query);
+  } catch (e) {}
+
   var route = {
     name: location.name || (record && record.name),
     meta: (record && record.meta) || {},
     path: location.path || '/',
     hash: location.hash || '',
-    query: location.query || {},
+    query: query,
     params: location.params || {},
     fullPath: getFullPath(location, stringifyQuery$$1),
     matched: record ? formatMatch(record) : []
@@ -248,6 +261,20 @@ function createRoute (
   return Object.freeze(route)
 }
 
+function clone (value) {
+  if (Array.isArray(value)) {
+    return value.map(clone)
+  } else if (value && typeof value === 'object') {
+    var res = {};
+    for (var key in value) {
+      res[key] = clone(value[key]);
+    }
+    return res
+  } else {
+    return value
+  }
+}
+
 // the starting route that represents the initial state
 var START = createRoute(null, {
   path: '/'
@@ -301,6 +328,8 @@ function isObjectEqual (a, b) {
   if ( a === void 0 ) a = {};
   if ( b === void 0 ) b = {};
 
+  // handle null value #1566
+  if (!a || !b) { return a === b }
   var aKeys = Object.keys(a);
   var bKeys = Object.keys(b);
   if (aKeys.length !== bKeys.length) {
@@ -480,7 +509,7 @@ function findAnchor (children) {
 var _Vue;
 
 function install (Vue) {
-  if (install.installed) { return }
+  if (install.installed && _Vue === Vue) { return }
   install.installed = true;
 
   _Vue = Vue;
@@ -602,14 +631,14 @@ function cleanPath (path) {
   return path.replace(/\/\//g, '/')
 }
 
-var index$1 = Array.isArray || function (arr) {
+var isarray = Array.isArray || function (arr) {
   return Object.prototype.toString.call(arr) == '[object Array]';
 };
 
 /**
  * Expose `pathToRegexp`.
  */
-var index = pathToRegexp;
+var pathToRegexp_1 = pathToRegexp;
 var parse_1 = parse;
 var compile_1 = compile;
 var tokensToFunction_1 = tokensToFunction;
@@ -786,7 +815,7 @@ function tokensToFunction (tokens) {
         }
       }
 
-      if (index$1(value)) {
+      if (isarray(value)) {
         if (!token.repeat) {
           throw new TypeError('Expected "' + token.name + '" to not repeat, but received `' + JSON.stringify(value) + '`')
         }
@@ -937,7 +966,7 @@ function stringToRegexp (path, keys, options) {
  * @return {!RegExp}
  */
 function tokensToRegExp (tokens, keys, options) {
-  if (!index$1(keys)) {
+  if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
@@ -1013,7 +1042,7 @@ function tokensToRegExp (tokens, keys, options) {
  * @return {!RegExp}
  */
 function pathToRegexp (path, keys, options) {
-  if (!index$1(keys)) {
+  if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
@@ -1024,20 +1053,21 @@ function pathToRegexp (path, keys, options) {
     return regexpToRegexp(path, /** @type {!Array} */ (keys))
   }
 
-  if (index$1(path)) {
+  if (isarray(path)) {
     return arrayToRegexp(/** @type {!Array} */ (path), /** @type {!Array} */ (keys), options)
   }
 
   return stringToRegexp(/** @type {string} */ (path), /** @type {!Array} */ (keys), options)
 }
 
-index.parse = parse_1;
-index.compile = compile_1;
-index.tokensToFunction = tokensToFunction_1;
-index.tokensToRegExp = tokensToRegExp_1;
+pathToRegexp_1.parse = parse_1;
+pathToRegexp_1.compile = compile_1;
+pathToRegexp_1.tokensToFunction = tokensToFunction_1;
+pathToRegexp_1.tokensToRegExp = tokensToRegExp_1;
 
 /*  */
 
+// $flow-disable-line
 var regexpCompileCache = Object.create(null);
 
 function fillParams (
@@ -1048,7 +1078,7 @@ function fillParams (
   try {
     var filler =
       regexpCompileCache[path] ||
-      (regexpCompileCache[path] = index.compile(path));
+      (regexpCompileCache[path] = pathToRegexp_1.compile(path));
     return filler(params || {}, { pretty: true })
   } catch (e) {
     if (process.env.NODE_ENV !== 'production') {
@@ -1068,7 +1098,9 @@ function createRouteMap (
 ) {
   // the path list is used to control path matching priority
   var pathList = oldPathList || [];
+  // $flow-disable-line
   var pathMap = oldPathMap || Object.create(null);
+  // $flow-disable-line
   var nameMap = oldNameMap || Object.create(null);
 
   routes.forEach(function (route) {
@@ -1110,8 +1142,12 @@ function addRouteRecord (
     );
   }
 
-  var normalizedPath = normalizePath(path, parent);
   var pathToRegexpOptions = route.pathToRegexpOptions || {};
+  var normalizedPath = normalizePath(
+    path,
+    parent,
+    pathToRegexpOptions.strict
+  );
 
   if (typeof route.caseSensitive === 'boolean') {
     pathToRegexpOptions.sensitive = route.caseSensitive;
@@ -1199,9 +1235,9 @@ function addRouteRecord (
 }
 
 function compileRouteRegex (path, pathToRegexpOptions) {
-  var regex = index(path, [], pathToRegexpOptions);
+  var regex = pathToRegexp_1(path, [], pathToRegexpOptions);
   if (process.env.NODE_ENV !== 'production') {
-    var keys = {};
+    var keys = Object.create(null);
     regex.keys.forEach(function (key) {
       warn(!keys[key.name], ("Duplicate param keys in route with path: \"" + path + "\""));
       keys[key.name] = true;
@@ -1210,8 +1246,8 @@ function compileRouteRegex (path, pathToRegexpOptions) {
   return regex
 }
 
-function normalizePath (path, parent) {
-  path = path.replace(/\/$/, '');
+function normalizePath (path, parent, strict) {
+  if (!strict) { path = path.replace(/\/$/, ''); }
   if (path[0] === '/') { return path }
   if (parent == null) { return path }
   return cleanPath(((parent.path) + "/" + path))
@@ -1483,6 +1519,8 @@ function resolveRecordPath (path, record) {
 var positionStore = Object.create(null);
 
 function setupScroll () {
+  // Fix for #1585 for Firefox
+  window.history.replaceState({ key: getStateKey() }, '');
   window.addEventListener('popstate', function (e) {
     saveScrollPosition();
     if (e.state && e.state.key) {
@@ -1514,25 +1552,21 @@ function handleScroll (
   router.app.$nextTick(function () {
     var position = getScrollPosition();
     var shouldScroll = behavior(to, from, isPop ? position : null);
+
     if (!shouldScroll) {
       return
     }
-    var isObject = typeof shouldScroll === 'object';
-    if (isObject && typeof shouldScroll.selector === 'string') {
-      var el = document.querySelector(shouldScroll.selector);
-      if (el) {
-        var offset = shouldScroll.offset && typeof shouldScroll.offset === 'object' ? shouldScroll.offset : {};
-        offset = normalizeOffset(offset);
-        position = getElementPosition(el, offset);
-      } else if (isValidPosition(shouldScroll)) {
-        position = normalizePosition(shouldScroll);
-      }
-    } else if (isObject && isValidPosition(shouldScroll)) {
-      position = normalizePosition(shouldScroll);
-    }
 
-    if (position) {
-      window.scrollTo(position.x, position.y);
+    if (typeof shouldScroll.then === 'function') {
+      shouldScroll.then(function (shouldScroll) {
+        scrollToPosition((shouldScroll), position);
+      }).catch(function (err) {
+        if (process.env.NODE_ENV !== 'production') {
+          assert(false, err.toString());
+        }
+      });
+    } else {
+      scrollToPosition(shouldScroll, position);
     }
   });
 }
@@ -1586,6 +1620,26 @@ function isNumber (v) {
   return typeof v === 'number'
 }
 
+function scrollToPosition (shouldScroll, position) {
+  var isObject = typeof shouldScroll === 'object';
+  if (isObject && typeof shouldScroll.selector === 'string') {
+    var el = document.querySelector(shouldScroll.selector);
+    if (el) {
+      var offset = shouldScroll.offset && typeof shouldScroll.offset === 'object' ? shouldScroll.offset : {};
+      offset = normalizeOffset(offset);
+      position = getElementPosition(el, offset);
+    } else if (isValidPosition(shouldScroll)) {
+      position = normalizePosition(shouldScroll);
+    }
+  } else if (isObject && isValidPosition(shouldScroll)) {
+    position = normalizePosition(shouldScroll);
+  }
+
+  if (position) {
+    window.scrollTo(position.x, position.y);
+  }
+}
+
 /*  */
 
 var supportsPushState = inBrowser && (function () {
@@ -1681,7 +1735,7 @@ function resolveAsyncComponents (matched) {
         pending++;
 
         var resolve = once(function (resolvedDef) {
-          if (resolvedDef.__esModule && resolvedDef.default) {
+          if (isESModule(resolvedDef)) {
             resolvedDef = resolvedDef.default;
           }
           // save resolved on async factory in case it's used elsewhere
@@ -1747,6 +1801,14 @@ function flatten (arr) {
   return Array.prototype.concat.apply([], arr)
 }
 
+var hasSymbol =
+  typeof Symbol === 'function' &&
+  typeof Symbol.toStringTag === 'symbol';
+
+function isESModule (obj) {
+  return obj.__esModule || (hasSymbol && obj[Symbol.toStringTag] === 'Module')
+}
+
 // in Webpack 2, require.ensure now also returns a Promise
 // so the resolve/reject functions may get called an extra time
 // if the user uses an arrow function shorthand that happens to
@@ -2075,9 +2137,18 @@ var HTML5History = (function (History$$1) {
       setupScroll();
     }
 
+    var initLocation = getLocation(this.base);
     window.addEventListener('popstate', function (e) {
       var current = this$1.current;
-      this$1.transitionTo(getLocation(this$1.base), function (route) {
+
+      // Avoiding first `popstate` event dispatched in some browsers but first
+      // history route not updated since async guard at the same time.
+      var location = getLocation(this$1.base);
+      if (this$1.current === START && location === initLocation) {
+        return
+      }
+
+      this$1.transitionTo(location, function (route) {
         if (expectScroll) {
           handleScroll(router, route, current, true);
         }
@@ -2161,26 +2232,50 @@ var HashHistory = (function (History$$1) {
   HashHistory.prototype.setupListeners = function setupListeners () {
     var this$1 = this;
 
-    window.addEventListener('hashchange', function () {
+    var router = this.router;
+    var expectScroll = router.options.scrollBehavior;
+    var supportsScroll = supportsPushState && expectScroll;
+
+    if (supportsScroll) {
+      setupScroll();
+    }
+
+    window.addEventListener(supportsPushState ? 'popstate' : 'hashchange', function () {
+      var current = this$1.current;
       if (!ensureSlash()) {
         return
       }
       this$1.transitionTo(getHash(), function (route) {
-        replaceHash(route.fullPath);
+        if (supportsScroll) {
+          handleScroll(this$1.router, route, current, true);
+        }
+        if (!supportsPushState) {
+          replaceHash(route.fullPath);
+        }
       });
     });
   };
 
   HashHistory.prototype.push = function push (location, onComplete, onAbort) {
+    var this$1 = this;
+
+    var ref = this;
+    var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       pushHash(route.fullPath);
+      handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   HashHistory.prototype.replace = function replace (location, onComplete, onAbort) {
+    var this$1 = this;
+
+    var ref = this;
+    var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       replaceHash(route.fullPath);
+      handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
@@ -2230,15 +2325,27 @@ function getHash () {
   return index === -1 ? '' : href.slice(index + 1)
 }
 
+function getUrl (path) {
+  var href = window.location.href;
+  var i = href.indexOf('#');
+  var base = i >= 0 ? href.slice(0, i) : href;
+  return (base + "#" + path)
+}
+
 function pushHash (path) {
-  window.location.hash = path;
+  if (supportsPushState) {
+    pushState(getUrl(path));
+  } else {
+    window.location.hash = path;
+  }
 }
 
 function replaceHash (path) {
-  var href = window.location.href;
-  var i = href.indexOf('#');
-  var base = i >= 0 ? href.slice(0, i) : href;
-  window.location.replace((base + "#" + path));
+  if (supportsPushState) {
+    replaceState(getUrl(path));
+  } else {
+    window.location.replace(getUrl(path));
+  }
 }
 
 /*  */
@@ -2340,7 +2447,7 @@ var VueRouter = function VueRouter (options) {
   }
 };
 
-var prototypeAccessors = { currentRoute: {} };
+var prototypeAccessors = { currentRoute: { configurable: true } };
 
 VueRouter.prototype.match = function match (
   raw,
@@ -2498,7 +2605,7 @@ function createHref (base, fullPath, mode) {
 }
 
 VueRouter.install = install;
-VueRouter.version = '2.7.0';
+VueRouter.version = '2.8.0';
 
 if (inBrowser && window.Vue) {
   window.Vue.use(VueRouter);
diff --git a/dist/vue-router.esm.js b/dist/vue-router.esm.js
index a2dc19c1f..2409a8405 100644
--- a/dist/vue-router.esm.js
+++ b/dist/vue-router.esm.js
@@ -1,5 +1,5 @@
 /**
-  * vue-router v2.7.0
+  * vue-router v2.8.0
   * (c) 2017 Evan You
   * @license MIT
   */
@@ -87,7 +87,7 @@ var View = {
       }
     }
 
-    // also regiseter instance in prepatch hook
+    // also register instance in prepatch hook
     // in case the same component instance is reused across different routes
     ;(data.hook || (data.hook = {})).prepatch = function (_, vnode) {
       matched.instances[name] = vnode.componentInstance;
@@ -95,6 +95,14 @@ var View = {
 
     // resolve props
     data.props = resolveProps(route, matched.props && matched.props[name]);
+    data.attrs = {};
+
+    for (var key in data.props) {
+      if (!('props' in component) || !(key in component.props)) {
+        data.attrs[key] = data.props[key];
+        delete data.props[key];
+      }
+    }
 
     return h(component, data, children)
   }
@@ -152,8 +160,7 @@ function resolveQuery (
     parsedQuery = {};
   }
   for (var key in extraQuery) {
-    var val = extraQuery[key];
-    parsedQuery[key] = Array.isArray(val) ? val.slice() : val;
+    parsedQuery[key] = extraQuery[key];
   }
   return parsedQuery
 }
@@ -230,12 +237,18 @@ function createRoute (
   router
 ) {
   var stringifyQuery$$1 = router && router.options.stringifyQuery;
+
+  var query = location.query || {};
+  try {
+    query = clone(query);
+  } catch (e) {}
+
   var route = {
     name: location.name || (record && record.name),
     meta: (record && record.meta) || {},
     path: location.path || '/',
     hash: location.hash || '',
-    query: location.query || {},
+    query: query,
     params: location.params || {},
     fullPath: getFullPath(location, stringifyQuery$$1),
     matched: record ? formatMatch(record) : []
@@ -246,6 +259,20 @@ function createRoute (
   return Object.freeze(route)
 }
 
+function clone (value) {
+  if (Array.isArray(value)) {
+    return value.map(clone)
+  } else if (value && typeof value === 'object') {
+    var res = {};
+    for (var key in value) {
+      res[key] = clone(value[key]);
+    }
+    return res
+  } else {
+    return value
+  }
+}
+
 // the starting route that represents the initial state
 var START = createRoute(null, {
   path: '/'
@@ -299,6 +326,8 @@ function isObjectEqual (a, b) {
   if ( a === void 0 ) a = {};
   if ( b === void 0 ) b = {};
 
+  // handle null value #1566
+  if (!a || !b) { return a === b }
   var aKeys = Object.keys(a);
   var bKeys = Object.keys(b);
   if (aKeys.length !== bKeys.length) {
@@ -478,7 +507,7 @@ function findAnchor (children) {
 var _Vue;
 
 function install (Vue) {
-  if (install.installed) { return }
+  if (install.installed && _Vue === Vue) { return }
   install.installed = true;
 
   _Vue = Vue;
@@ -600,14 +629,14 @@ function cleanPath (path) {
   return path.replace(/\/\//g, '/')
 }
 
-var index$1 = Array.isArray || function (arr) {
+var isarray = Array.isArray || function (arr) {
   return Object.prototype.toString.call(arr) == '[object Array]';
 };
 
 /**
  * Expose `pathToRegexp`.
  */
-var index = pathToRegexp;
+var pathToRegexp_1 = pathToRegexp;
 var parse_1 = parse;
 var compile_1 = compile;
 var tokensToFunction_1 = tokensToFunction;
@@ -784,7 +813,7 @@ function tokensToFunction (tokens) {
         }
       }
 
-      if (index$1(value)) {
+      if (isarray(value)) {
         if (!token.repeat) {
           throw new TypeError('Expected "' + token.name + '" to not repeat, but received `' + JSON.stringify(value) + '`')
         }
@@ -935,7 +964,7 @@ function stringToRegexp (path, keys, options) {
  * @return {!RegExp}
  */
 function tokensToRegExp (tokens, keys, options) {
-  if (!index$1(keys)) {
+  if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
@@ -1011,7 +1040,7 @@ function tokensToRegExp (tokens, keys, options) {
  * @return {!RegExp}
  */
 function pathToRegexp (path, keys, options) {
-  if (!index$1(keys)) {
+  if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
@@ -1022,20 +1051,21 @@ function pathToRegexp (path, keys, options) {
     return regexpToRegexp(path, /** @type {!Array} */ (keys))
   }
 
-  if (index$1(path)) {
+  if (isarray(path)) {
     return arrayToRegexp(/** @type {!Array} */ (path), /** @type {!Array} */ (keys), options)
   }
 
   return stringToRegexp(/** @type {string} */ (path), /** @type {!Array} */ (keys), options)
 }
 
-index.parse = parse_1;
-index.compile = compile_1;
-index.tokensToFunction = tokensToFunction_1;
-index.tokensToRegExp = tokensToRegExp_1;
+pathToRegexp_1.parse = parse_1;
+pathToRegexp_1.compile = compile_1;
+pathToRegexp_1.tokensToFunction = tokensToFunction_1;
+pathToRegexp_1.tokensToRegExp = tokensToRegExp_1;
 
 /*  */
 
+// $flow-disable-line
 var regexpCompileCache = Object.create(null);
 
 function fillParams (
@@ -1046,7 +1076,7 @@ function fillParams (
   try {
     var filler =
       regexpCompileCache[path] ||
-      (regexpCompileCache[path] = index.compile(path));
+      (regexpCompileCache[path] = pathToRegexp_1.compile(path));
     return filler(params || {}, { pretty: true })
   } catch (e) {
     if (process.env.NODE_ENV !== 'production') {
@@ -1066,7 +1096,9 @@ function createRouteMap (
 ) {
   // the path list is used to control path matching priority
   var pathList = oldPathList || [];
+  // $flow-disable-line
   var pathMap = oldPathMap || Object.create(null);
+  // $flow-disable-line
   var nameMap = oldNameMap || Object.create(null);
 
   routes.forEach(function (route) {
@@ -1108,8 +1140,12 @@ function addRouteRecord (
     );
   }
 
-  var normalizedPath = normalizePath(path, parent);
   var pathToRegexpOptions = route.pathToRegexpOptions || {};
+  var normalizedPath = normalizePath(
+    path,
+    parent,
+    pathToRegexpOptions.strict
+  );
 
   if (typeof route.caseSensitive === 'boolean') {
     pathToRegexpOptions.sensitive = route.caseSensitive;
@@ -1197,9 +1233,9 @@ function addRouteRecord (
 }
 
 function compileRouteRegex (path, pathToRegexpOptions) {
-  var regex = index(path, [], pathToRegexpOptions);
+  var regex = pathToRegexp_1(path, [], pathToRegexpOptions);
   if (process.env.NODE_ENV !== 'production') {
-    var keys = {};
+    var keys = Object.create(null);
     regex.keys.forEach(function (key) {
       warn(!keys[key.name], ("Duplicate param keys in route with path: \"" + path + "\""));
       keys[key.name] = true;
@@ -1208,8 +1244,8 @@ function compileRouteRegex (path, pathToRegexpOptions) {
   return regex
 }
 
-function normalizePath (path, parent) {
-  path = path.replace(/\/$/, '');
+function normalizePath (path, parent, strict) {
+  if (!strict) { path = path.replace(/\/$/, ''); }
   if (path[0] === '/') { return path }
   if (parent == null) { return path }
   return cleanPath(((parent.path) + "/" + path))
@@ -1481,6 +1517,8 @@ function resolveRecordPath (path, record) {
 var positionStore = Object.create(null);
 
 function setupScroll () {
+  // Fix for #1585 for Firefox
+  window.history.replaceState({ key: getStateKey() }, '');
   window.addEventListener('popstate', function (e) {
     saveScrollPosition();
     if (e.state && e.state.key) {
@@ -1512,25 +1550,21 @@ function handleScroll (
   router.app.$nextTick(function () {
     var position = getScrollPosition();
     var shouldScroll = behavior(to, from, isPop ? position : null);
+
     if (!shouldScroll) {
       return
     }
-    var isObject = typeof shouldScroll === 'object';
-    if (isObject && typeof shouldScroll.selector === 'string') {
-      var el = document.querySelector(shouldScroll.selector);
-      if (el) {
-        var offset = shouldScroll.offset && typeof shouldScroll.offset === 'object' ? shouldScroll.offset : {};
-        offset = normalizeOffset(offset);
-        position = getElementPosition(el, offset);
-      } else if (isValidPosition(shouldScroll)) {
-        position = normalizePosition(shouldScroll);
-      }
-    } else if (isObject && isValidPosition(shouldScroll)) {
-      position = normalizePosition(shouldScroll);
-    }
 
-    if (position) {
-      window.scrollTo(position.x, position.y);
+    if (typeof shouldScroll.then === 'function') {
+      shouldScroll.then(function (shouldScroll) {
+        scrollToPosition((shouldScroll), position);
+      }).catch(function (err) {
+        if (process.env.NODE_ENV !== 'production') {
+          assert(false, err.toString());
+        }
+      });
+    } else {
+      scrollToPosition(shouldScroll, position);
     }
   });
 }
@@ -1584,6 +1618,26 @@ function isNumber (v) {
   return typeof v === 'number'
 }
 
+function scrollToPosition (shouldScroll, position) {
+  var isObject = typeof shouldScroll === 'object';
+  if (isObject && typeof shouldScroll.selector === 'string') {
+    var el = document.querySelector(shouldScroll.selector);
+    if (el) {
+      var offset = shouldScroll.offset && typeof shouldScroll.offset === 'object' ? shouldScroll.offset : {};
+      offset = normalizeOffset(offset);
+      position = getElementPosition(el, offset);
+    } else if (isValidPosition(shouldScroll)) {
+      position = normalizePosition(shouldScroll);
+    }
+  } else if (isObject && isValidPosition(shouldScroll)) {
+    position = normalizePosition(shouldScroll);
+  }
+
+  if (position) {
+    window.scrollTo(position.x, position.y);
+  }
+}
+
 /*  */
 
 var supportsPushState = inBrowser && (function () {
@@ -1679,7 +1733,7 @@ function resolveAsyncComponents (matched) {
         pending++;
 
         var resolve = once(function (resolvedDef) {
-          if (resolvedDef.__esModule && resolvedDef.default) {
+          if (isESModule(resolvedDef)) {
             resolvedDef = resolvedDef.default;
           }
           // save resolved on async factory in case it's used elsewhere
@@ -1745,6 +1799,14 @@ function flatten (arr) {
   return Array.prototype.concat.apply([], arr)
 }
 
+var hasSymbol =
+  typeof Symbol === 'function' &&
+  typeof Symbol.toStringTag === 'symbol';
+
+function isESModule (obj) {
+  return obj.__esModule || (hasSymbol && obj[Symbol.toStringTag] === 'Module')
+}
+
 // in Webpack 2, require.ensure now also returns a Promise
 // so the resolve/reject functions may get called an extra time
 // if the user uses an arrow function shorthand that happens to
@@ -2073,9 +2135,18 @@ var HTML5History = (function (History$$1) {
       setupScroll();
     }
 
+    var initLocation = getLocation(this.base);
     window.addEventListener('popstate', function (e) {
       var current = this$1.current;
-      this$1.transitionTo(getLocation(this$1.base), function (route) {
+
+      // Avoiding first `popstate` event dispatched in some browsers but first
+      // history route not updated since async guard at the same time.
+      var location = getLocation(this$1.base);
+      if (this$1.current === START && location === initLocation) {
+        return
+      }
+
+      this$1.transitionTo(location, function (route) {
         if (expectScroll) {
           handleScroll(router, route, current, true);
         }
@@ -2159,26 +2230,50 @@ var HashHistory = (function (History$$1) {
   HashHistory.prototype.setupListeners = function setupListeners () {
     var this$1 = this;
 
-    window.addEventListener('hashchange', function () {
+    var router = this.router;
+    var expectScroll = router.options.scrollBehavior;
+    var supportsScroll = supportsPushState && expectScroll;
+
+    if (supportsScroll) {
+      setupScroll();
+    }
+
+    window.addEventListener(supportsPushState ? 'popstate' : 'hashchange', function () {
+      var current = this$1.current;
       if (!ensureSlash()) {
         return
       }
       this$1.transitionTo(getHash(), function (route) {
-        replaceHash(route.fullPath);
+        if (supportsScroll) {
+          handleScroll(this$1.router, route, current, true);
+        }
+        if (!supportsPushState) {
+          replaceHash(route.fullPath);
+        }
       });
     });
   };
 
   HashHistory.prototype.push = function push (location, onComplete, onAbort) {
+    var this$1 = this;
+
+    var ref = this;
+    var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       pushHash(route.fullPath);
+      handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   HashHistory.prototype.replace = function replace (location, onComplete, onAbort) {
+    var this$1 = this;
+
+    var ref = this;
+    var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       replaceHash(route.fullPath);
+      handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
@@ -2228,15 +2323,27 @@ function getHash () {
   return index === -1 ? '' : href.slice(index + 1)
 }
 
+function getUrl (path) {
+  var href = window.location.href;
+  var i = href.indexOf('#');
+  var base = i >= 0 ? href.slice(0, i) : href;
+  return (base + "#" + path)
+}
+
 function pushHash (path) {
-  window.location.hash = path;
+  if (supportsPushState) {
+    pushState(getUrl(path));
+  } else {
+    window.location.hash = path;
+  }
 }
 
 function replaceHash (path) {
-  var href = window.location.href;
-  var i = href.indexOf('#');
-  var base = i >= 0 ? href.slice(0, i) : href;
-  window.location.replace((base + "#" + path));
+  if (supportsPushState) {
+    replaceState(getUrl(path));
+  } else {
+    window.location.replace(getUrl(path));
+  }
 }
 
 /*  */
@@ -2338,7 +2445,7 @@ var VueRouter = function VueRouter (options) {
   }
 };
 
-var prototypeAccessors = { currentRoute: {} };
+var prototypeAccessors = { currentRoute: { configurable: true } };
 
 VueRouter.prototype.match = function match (
   raw,
@@ -2496,7 +2603,7 @@ function createHref (base, fullPath, mode) {
 }
 
 VueRouter.install = install;
-VueRouter.version = '2.7.0';
+VueRouter.version = '2.8.0';
 
 if (inBrowser && window.Vue) {
   window.Vue.use(VueRouter);
diff --git a/dist/vue-router.js b/dist/vue-router.js
index c7c26bb64..905b8c79a 100644
--- a/dist/vue-router.js
+++ b/dist/vue-router.js
@@ -1,5 +1,5 @@
 /**
-  * vue-router v2.7.0
+  * vue-router v2.8.0
   * (c) 2017 Evan You
   * @license MIT
   */
@@ -93,7 +93,7 @@ var View = {
       }
     }
 
-    // also regiseter instance in prepatch hook
+    // also register instance in prepatch hook
     // in case the same component instance is reused across different routes
     ;(data.hook || (data.hook = {})).prepatch = function (_, vnode) {
       matched.instances[name] = vnode.componentInstance;
@@ -101,6 +101,14 @@ var View = {
 
     // resolve props
     data.props = resolveProps(route, matched.props && matched.props[name]);
+    data.attrs = {};
+
+    for (var key in data.props) {
+      if (!('props' in component) || !(key in component.props)) {
+        data.attrs[key] = data.props[key];
+        delete data.props[key];
+      }
+    }
 
     return h(component, data, children)
   }
@@ -158,8 +166,7 @@ function resolveQuery (
     parsedQuery = {};
   }
   for (var key in extraQuery) {
-    var val = extraQuery[key];
-    parsedQuery[key] = Array.isArray(val) ? val.slice() : val;
+    parsedQuery[key] = extraQuery[key];
   }
   return parsedQuery
 }
@@ -236,12 +243,18 @@ function createRoute (
   router
 ) {
   var stringifyQuery$$1 = router && router.options.stringifyQuery;
+
+  var query = location.query || {};
+  try {
+    query = clone(query);
+  } catch (e) {}
+
   var route = {
     name: location.name || (record && record.name),
     meta: (record && record.meta) || {},
     path: location.path || '/',
     hash: location.hash || '',
-    query: location.query || {},
+    query: query,
     params: location.params || {},
     fullPath: getFullPath(location, stringifyQuery$$1),
     matched: record ? formatMatch(record) : []
@@ -252,6 +265,20 @@ function createRoute (
   return Object.freeze(route)
 }
 
+function clone (value) {
+  if (Array.isArray(value)) {
+    return value.map(clone)
+  } else if (value && typeof value === 'object') {
+    var res = {};
+    for (var key in value) {
+      res[key] = clone(value[key]);
+    }
+    return res
+  } else {
+    return value
+  }
+}
+
 // the starting route that represents the initial state
 var START = createRoute(null, {
   path: '/'
@@ -305,6 +332,8 @@ function isObjectEqual (a, b) {
   if ( a === void 0 ) a = {};
   if ( b === void 0 ) b = {};
 
+  // handle null value #1566
+  if (!a || !b) { return a === b }
   var aKeys = Object.keys(a);
   var bKeys = Object.keys(b);
   if (aKeys.length !== bKeys.length) {
@@ -484,7 +513,7 @@ function findAnchor (children) {
 var _Vue;
 
 function install (Vue) {
-  if (install.installed) { return }
+  if (install.installed && _Vue === Vue) { return }
   install.installed = true;
 
   _Vue = Vue;
@@ -606,14 +635,14 @@ function cleanPath (path) {
   return path.replace(/\/\//g, '/')
 }
 
-var index$1 = Array.isArray || function (arr) {
+var isarray = Array.isArray || function (arr) {
   return Object.prototype.toString.call(arr) == '[object Array]';
 };
 
 /**
  * Expose `pathToRegexp`.
  */
-var index = pathToRegexp;
+var pathToRegexp_1 = pathToRegexp;
 var parse_1 = parse;
 var compile_1 = compile;
 var tokensToFunction_1 = tokensToFunction;
@@ -790,7 +819,7 @@ function tokensToFunction (tokens) {
         }
       }
 
-      if (index$1(value)) {
+      if (isarray(value)) {
         if (!token.repeat) {
           throw new TypeError('Expected "' + token.name + '" to not repeat, but received `' + JSON.stringify(value) + '`')
         }
@@ -941,7 +970,7 @@ function stringToRegexp (path, keys, options) {
  * @return {!RegExp}
  */
 function tokensToRegExp (tokens, keys, options) {
-  if (!index$1(keys)) {
+  if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
@@ -1017,7 +1046,7 @@ function tokensToRegExp (tokens, keys, options) {
  * @return {!RegExp}
  */
 function pathToRegexp (path, keys, options) {
-  if (!index$1(keys)) {
+  if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
@@ -1028,20 +1057,21 @@ function pathToRegexp (path, keys, options) {
     return regexpToRegexp(path, /** @type {!Array} */ (keys))
   }
 
-  if (index$1(path)) {
+  if (isarray(path)) {
     return arrayToRegexp(/** @type {!Array} */ (path), /** @type {!Array} */ (keys), options)
   }
 
   return stringToRegexp(/** @type {string} */ (path), /** @type {!Array} */ (keys), options)
 }
 
-index.parse = parse_1;
-index.compile = compile_1;
-index.tokensToFunction = tokensToFunction_1;
-index.tokensToRegExp = tokensToRegExp_1;
+pathToRegexp_1.parse = parse_1;
+pathToRegexp_1.compile = compile_1;
+pathToRegexp_1.tokensToFunction = tokensToFunction_1;
+pathToRegexp_1.tokensToRegExp = tokensToRegExp_1;
 
 /*  */
 
+// $flow-disable-line
 var regexpCompileCache = Object.create(null);
 
 function fillParams (
@@ -1052,7 +1082,7 @@ function fillParams (
   try {
     var filler =
       regexpCompileCache[path] ||
-      (regexpCompileCache[path] = index.compile(path));
+      (regexpCompileCache[path] = pathToRegexp_1.compile(path));
     return filler(params || {}, { pretty: true })
   } catch (e) {
     {
@@ -1072,7 +1102,9 @@ function createRouteMap (
 ) {
   // the path list is used to control path matching priority
   var pathList = oldPathList || [];
+  // $flow-disable-line
   var pathMap = oldPathMap || Object.create(null);
+  // $flow-disable-line
   var nameMap = oldNameMap || Object.create(null);
 
   routes.forEach(function (route) {
@@ -1114,8 +1146,12 @@ function addRouteRecord (
     );
   }
 
-  var normalizedPath = normalizePath(path, parent);
   var pathToRegexpOptions = route.pathToRegexpOptions || {};
+  var normalizedPath = normalizePath(
+    path,
+    parent,
+    pathToRegexpOptions.strict
+  );
 
   if (typeof route.caseSensitive === 'boolean') {
     pathToRegexpOptions.sensitive = route.caseSensitive;
@@ -1203,9 +1239,9 @@ function addRouteRecord (
 }
 
 function compileRouteRegex (path, pathToRegexpOptions) {
-  var regex = index(path, [], pathToRegexpOptions);
+  var regex = pathToRegexp_1(path, [], pathToRegexpOptions);
   {
-    var keys = {};
+    var keys = Object.create(null);
     regex.keys.forEach(function (key) {
       warn(!keys[key.name], ("Duplicate param keys in route with path: \"" + path + "\""));
       keys[key.name] = true;
@@ -1214,8 +1250,8 @@ function compileRouteRegex (path, pathToRegexpOptions) {
   return regex
 }
 
-function normalizePath (path, parent) {
-  path = path.replace(/\/$/, '');
+function normalizePath (path, parent, strict) {
+  if (!strict) { path = path.replace(/\/$/, ''); }
   if (path[0] === '/') { return path }
   if (parent == null) { return path }
   return cleanPath(((parent.path) + "/" + path))
@@ -1487,6 +1523,8 @@ function resolveRecordPath (path, record) {
 var positionStore = Object.create(null);
 
 function setupScroll () {
+  // Fix for #1585 for Firefox
+  window.history.replaceState({ key: getStateKey() }, '');
   window.addEventListener('popstate', function (e) {
     saveScrollPosition();
     if (e.state && e.state.key) {
@@ -1518,25 +1556,21 @@ function handleScroll (
   router.app.$nextTick(function () {
     var position = getScrollPosition();
     var shouldScroll = behavior(to, from, isPop ? position : null);
+
     if (!shouldScroll) {
       return
     }
-    var isObject = typeof shouldScroll === 'object';
-    if (isObject && typeof shouldScroll.selector === 'string') {
-      var el = document.querySelector(shouldScroll.selector);
-      if (el) {
-        var offset = shouldScroll.offset && typeof shouldScroll.offset === 'object' ? shouldScroll.offset : {};
-        offset = normalizeOffset(offset);
-        position = getElementPosition(el, offset);
-      } else if (isValidPosition(shouldScroll)) {
-        position = normalizePosition(shouldScroll);
-      }
-    } else if (isObject && isValidPosition(shouldScroll)) {
-      position = normalizePosition(shouldScroll);
-    }
 
-    if (position) {
-      window.scrollTo(position.x, position.y);
+    if (typeof shouldScroll.then === 'function') {
+      shouldScroll.then(function (shouldScroll) {
+        scrollToPosition((shouldScroll), position);
+      }).catch(function (err) {
+        {
+          assert(false, err.toString());
+        }
+      });
+    } else {
+      scrollToPosition(shouldScroll, position);
     }
   });
 }
@@ -1590,6 +1624,26 @@ function isNumber (v) {
   return typeof v === 'number'
 }
 
+function scrollToPosition (shouldScroll, position) {
+  var isObject = typeof shouldScroll === 'object';
+  if (isObject && typeof shouldScroll.selector === 'string') {
+    var el = document.querySelector(shouldScroll.selector);
+    if (el) {
+      var offset = shouldScroll.offset && typeof shouldScroll.offset === 'object' ? shouldScroll.offset : {};
+      offset = normalizeOffset(offset);
+      position = getElementPosition(el, offset);
+    } else if (isValidPosition(shouldScroll)) {
+      position = normalizePosition(shouldScroll);
+    }
+  } else if (isObject && isValidPosition(shouldScroll)) {
+    position = normalizePosition(shouldScroll);
+  }
+
+  if (position) {
+    window.scrollTo(position.x, position.y);
+  }
+}
+
 /*  */
 
 var supportsPushState = inBrowser && (function () {
@@ -1685,7 +1739,7 @@ function resolveAsyncComponents (matched) {
         pending++;
 
         var resolve = once(function (resolvedDef) {
-          if (resolvedDef.__esModule && resolvedDef.default) {
+          if (isESModule(resolvedDef)) {
             resolvedDef = resolvedDef.default;
           }
           // save resolved on async factory in case it's used elsewhere
@@ -1751,6 +1805,14 @@ function flatten (arr) {
   return Array.prototype.concat.apply([], arr)
 }
 
+var hasSymbol =
+  typeof Symbol === 'function' &&
+  typeof Symbol.toStringTag === 'symbol';
+
+function isESModule (obj) {
+  return obj.__esModule || (hasSymbol && obj[Symbol.toStringTag] === 'Module')
+}
+
 // in Webpack 2, require.ensure now also returns a Promise
 // so the resolve/reject functions may get called an extra time
 // if the user uses an arrow function shorthand that happens to
@@ -2079,9 +2141,18 @@ var HTML5History = (function (History$$1) {
       setupScroll();
     }
 
+    var initLocation = getLocation(this.base);
     window.addEventListener('popstate', function (e) {
       var current = this$1.current;
-      this$1.transitionTo(getLocation(this$1.base), function (route) {
+
+      // Avoiding first `popstate` event dispatched in some browsers but first
+      // history route not updated since async guard at the same time.
+      var location = getLocation(this$1.base);
+      if (this$1.current === START && location === initLocation) {
+        return
+      }
+
+      this$1.transitionTo(location, function (route) {
         if (expectScroll) {
           handleScroll(router, route, current, true);
         }
@@ -2165,26 +2236,50 @@ var HashHistory = (function (History$$1) {
   HashHistory.prototype.setupListeners = function setupListeners () {
     var this$1 = this;
 
-    window.addEventListener('hashchange', function () {
+    var router = this.router;
+    var expectScroll = router.options.scrollBehavior;
+    var supportsScroll = supportsPushState && expectScroll;
+
+    if (supportsScroll) {
+      setupScroll();
+    }
+
+    window.addEventListener(supportsPushState ? 'popstate' : 'hashchange', function () {
+      var current = this$1.current;
       if (!ensureSlash()) {
         return
       }
       this$1.transitionTo(getHash(), function (route) {
-        replaceHash(route.fullPath);
+        if (supportsScroll) {
+          handleScroll(this$1.router, route, current, true);
+        }
+        if (!supportsPushState) {
+          replaceHash(route.fullPath);
+        }
       });
     });
   };
 
   HashHistory.prototype.push = function push (location, onComplete, onAbort) {
+    var this$1 = this;
+
+    var ref = this;
+    var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       pushHash(route.fullPath);
+      handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   HashHistory.prototype.replace = function replace (location, onComplete, onAbort) {
+    var this$1 = this;
+
+    var ref = this;
+    var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       replaceHash(route.fullPath);
+      handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
@@ -2234,15 +2329,27 @@ function getHash () {
   return index === -1 ? '' : href.slice(index + 1)
 }
 
+function getUrl (path) {
+  var href = window.location.href;
+  var i = href.indexOf('#');
+  var base = i >= 0 ? href.slice(0, i) : href;
+  return (base + "#" + path)
+}
+
 function pushHash (path) {
-  window.location.hash = path;
+  if (supportsPushState) {
+    pushState(getUrl(path));
+  } else {
+    window.location.hash = path;
+  }
 }
 
 function replaceHash (path) {
-  var href = window.location.href;
-  var i = href.indexOf('#');
-  var base = i >= 0 ? href.slice(0, i) : href;
-  window.location.replace((base + "#" + path));
+  if (supportsPushState) {
+    replaceState(getUrl(path));
+  } else {
+    window.location.replace(getUrl(path));
+  }
 }
 
 /*  */
@@ -2344,7 +2451,7 @@ var VueRouter = function VueRouter (options) {
   }
 };
 
-var prototypeAccessors = { currentRoute: {} };
+var prototypeAccessors = { currentRoute: { configurable: true } };
 
 VueRouter.prototype.match = function match (
   raw,
@@ -2502,7 +2609,7 @@ function createHref (base, fullPath, mode) {
 }
 
 VueRouter.install = install;
-VueRouter.version = '2.7.0';
+VueRouter.version = '2.8.0';
 
 if (inBrowser && window.Vue) {
   window.Vue.use(VueRouter);
diff --git a/dist/vue-router.min.js b/dist/vue-router.min.js
index 4f71c8057..1d343cf02 100644
--- a/dist/vue-router.min.js
+++ b/dist/vue-router.min.js
@@ -1,6 +1,6 @@
 /**
-  * vue-router v2.7.0
+  * vue-router v2.8.0
   * (c) 2017 Evan You
   * @license MIT
   */
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.VueRouter=e()}(this,function(){"use strict";function t(t,e){}function e(t){return Object.prototype.toString.call(t).indexOf("Error")>-1}function r(t,e){switch(typeof e){case"undefined":return;case"object":return e;case"function":return e(t);case"boolean":return e?t.params:void 0}}function n(t,e,r){void 0===e&&(e={});var n,i=r||o;try{n=i(t||"")}catch(t){n={}}for(var a in e){var u=e[a];n[a]=Array.isArray(u)?u.slice():u}return n}function o(t){var e={};return(t=t.trim().replace(/^(\?|#|&)/,""))?(t.split("&").forEach(function(t){var r=t.replace(/\+/g," ").split("="),n=$t(r.shift()),o=r.length>0?$t(r.join("=")):null;void 0===e[n]?e[n]=o:Array.isArray(e[n])?e[n].push(o):e[n]=[e[n],o]}),e):e}function i(t){var e=t?Object.keys(t).map(function(e){var r=t[e];if(void 0===r)return"";if(null===r)return Tt(e);if(Array.isArray(r)){var n=[];return r.forEach(function(t){void 0!==t&&(null===t?n.push(Tt(e)):n.push(Tt(e)+"="+Tt(t)))}),n.join("&")}return Tt(e)+"="+Tt(r)}).filter(function(t){return t.length>0}).join("&"):null;return e?"?"+e:""}function a(t,e,r,n){var o=n&&n.options.stringifyQuery,i={name:e.name||t&&t.name,meta:t&&t.meta||{},path:e.path||"/",hash:e.hash||"",query:e.query||{},params:e.params||{},fullPath:c(e,o),matched:t?u(t):[]};return r&&(i.redirectedFrom=c(r,o)),Object.freeze(i)}function u(t){for(var e=[];t;)e.unshift(t),t=t.parent;return e}function c(t,e){var r=t.path,n=t.query;void 0===n&&(n={});var o=t.hash;void 0===o&&(o="");var a=e||i;return(r||"/")+a(n)+o}function s(t,e){return e===qt?t===e:!!e&&(t.path&&e.path?t.path.replace(St,"")===e.path.replace(St,"")&&t.hash===e.hash&&p(t.query,e.query):!(!t.name||!e.name)&&(t.name===e.name&&t.hash===e.hash&&p(t.query,e.query)&&p(t.params,e.params)))}function p(t,e){void 0===t&&(t={}),void 0===e&&(e={});var r=Object.keys(t),n=Object.keys(e);return 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