JS 代码片段汇总

[shiiiiiiji]

/**
 * 生成一个len+1的随机数，包含最后一位交验位
 * @param len
 * @returns {string}
 */
const randomArray = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
const randomArrayLength = randomArray.length;
function rand(len, check = true) {
    let sum = '';
    let index;
    let count = 0;
    for (let i = 0; i < len; i++) {
        index = Math.floor(Math.random() * randomArrayLength);
        sum += randomArray.charAt(index);
        count += randomArray.charCodeAt(index);
    }
    if(check){
        //是否添加校验位
        sum += randomArray.charAt(count % randomArrayLength);
    }
    return sum;
}

[shiiiiiiji]

id2url(id, version) {
	if (!version) version = 1;
	if (typeof id === 'string' && id.length === 24) {
		return id;
	}
	if (id instanceof Array) {
		for (let i = 0; i < id.length; i++) {
			const value = id[i];
			id[i] = this.id2url(value);
		}
		return id;
	} else if (parseInt(id, 10) > 0) {
		let url;
		switch (version) {
			case 1:
				url = version + parseInt(`${id * 2 + 56}`, 10 | 0).toString(36 | 0);
				break;
			default:
				url = false;
				break;
		}
		return url;
	}
	return id;
}

url2id(url, check) {
	if (!check) check = false;
	if (url.length === 24 && url.match(/^[0-9a-f]+$/)) return url;  //兼容MongoId

	if (url instanceof Array) {
		for (var i = 0; i < url.length; i++) {
			var value = url[i];
			url[i] = this.url2id(value);
		}
		return url;
	}
	else if (url.indexOf(',') > 0) {
		url = url.split(',');
		for (var i = 0; i < url.length; i++) {
			var value = url[i];
			if (!value) {
				delete url[i];
				continue;
			}
			url[i] = this.url2id(value);
		}
		return url.join(',');
	}
	else {
		if (check && url.match(/^(null|undefined)$/i)) {
			return false;
		}
		const version = parseInt(url.substr(0, 1));
		let id = 0;
		switch (version) {
			case 1:
				//id = (parseInt(base_convert(url.substr(1), 36, 10)) - 56) / 2;
				id = (parseInt(
					parseInt(url.substr(1) + '', 36 | 0).toString(10 | 0)) - 56) / 2;
				break;
			case 2:  //防止扫用户;
			case 3:
			case 4:
			case 5:
			case 6:
			case 7:
			case 8:
			case 9:
				id = 0;
				break;

			default:
				id = url;
				break;
		}
		return 0 < id ? parseInt(id) : 0;
	}
}