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index.html
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<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>浏览器重绘重排</title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
li{
list-style: none;
}
.wrapper{
width: 500px;
margin: 20px auto;
display: flex;
}
.wrapper section{
width: 250px;
flex: 1;
}
.poemList li{
width: 100%;
text-align: center;
}
.btn{
margin: 5px auto 0;
text-align: center;
}
.btn button{
padding: 5px 10px;
}
.timeOutput{
width: 100%;
text-align: center;
}
.active{
color:#38c411;
font-size: 20px;
font-weight: bold;
}
</style>
</head>
<body>
<div class="wrapper">
<section class="normalArea">
<ul class="poemList" id="poemListNormal">
<li>关关雎鸠，在河之洲。</li>
<li>窈窕淑女，君子好逑。</li>
<li>参差荇菜，左右流之。</li>
<li>窈窕淑女，寤寐求之。</li>
<li>求之不得，寤寐思服。</li>
<li>悠哉悠哉，辗转反侧。</li>
<li>参差荇菜，左右采之。</li>
<li>窈窕淑女，琴瑟友之。</li>
<li>参差荇菜，左右芼之。</li>
<li>窈窕淑女，钟鼓乐之。</li>
</ul>
<div class="btn">
<button id="btnNormal">不优化</button>
</div>
<p class="timeOutput" id="timeNormal"><span ></span></p>
</section>
<section class="optimizeArea">
<ul class="poemList" id="poemListOptimize">
<li>关关雎鸠，在河之洲。</li>
<li>窈窕淑女，君子好逑。</li>
<li>参差荇菜，左右流之。</li>
<li>窈窕淑女，寤寐求之。</li>
<li>求之不得，寤寐思服。</li>
<li>悠哉悠哉，辗转反侧。</li>
<li>参差荇菜，左右采之。</li>
<li>窈窕淑女，琴瑟友之。</li>
<li>参差荇菜，左右芼之。</li>
<li>窈窕淑女，钟鼓乐之。</li>
</ul>
<div class="btn">
<button id="btnOptimize">优化</button>
</div>
<p class="timeOutput" id="timeOptimize"></p>
</section>
</div>
<script type="text/javascript">
function changeSth(){
let timeStart = window.performance.now();
let poems = document.querySelectorAll("#poemListNormal > li");
for(let i = 0; i < poems.length; i++){
poems[i].style.color = "#38c411";
poems[i].style.fontSize = "20px";
poems[i].style.fontWeight = "bold";
}
let timeEnd = window.performance.now();
document.getElementById("timeNormal").innerText = Math.round((timeEnd - timeStart) * 1000) + "ms"
}
function changeSthOptimize(){
let timeStart = window.performance.now();
let poems = document.querySelectorAll("#poemListOptimize > li");
for(let i = 0; i < poems.length; i++){
poems[i].classList.add("active");
}
let timeEnd = window.performance.now();
document.getElementById("timeOptimize").innerText = Math.round((timeEnd - timeStart) * 1000) + "ms"
}
document.getElementById("btnNormal").onclick = changeSth;
document.getElementById("btnOptimize").onclick = changeSthOptimize;
</script>
</body>
</html>