1、原生JavaScript实现字符串长度截取
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function cutstr(str, len) { |
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var temp; |
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var icount = 0; |
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var patrn = /[^\x00-\xff]/; |
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var strre = ""; |
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for (var i = 0; i < str.length; i++) { |
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if (icount < len - 1) { |
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temp = str.substr(i, 1); |
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if (patrn.exec(temp) == null) { |
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icount = icount + 1 |
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} else { |
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icount = icount + 2 |
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} |
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strre += temp |
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} else { |
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break |
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} |
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} |
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return strre + "..." |
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} |
2、原生JavaScript获取域名主机
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function getHost(url) { |
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var host = "null"; |
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if(typeof url == "undefined"|| null == url) { |
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url = window.location.href; |
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} |
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var regex = /^\w+\:\/\/([^\/]*).*/; |
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var match = url.match(regex); |
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if(typeof match != "undefined" && null != match) { |
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host = match[1]; |
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} |
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return host; |
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} |
3、原生JavaScript清除空格
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String.prototype.trim = function() { |
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var reExtraSpace = /^\s*(.*?)\s+$/; |
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return this.replace(reExtraSpace, "$1") |
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} |
4、原生JavaScript替换全部
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String.prototype.replaceAll = function(s1, s2) { |
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return this.replace(new RegExp(s1, "gm"), s2) |
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} |
5、原生JavaScript转义html标签
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function HtmlEncode(text) { |
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return text.replace(/&/g, ‘&‘).replace(/\"/g, ‘"‘).replace(/</g, ‘<‘).replace(/>/g, ‘>‘) |
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} |
6、原生JavaScript还原html标签
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function HtmlDecode(text) { |
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return text.replace(/&/g, ‘&‘).replace(/"/g, ‘\"‘).replace(/</g, ‘<‘).replace(/>/g, ‘>‘) |
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} |
7、原生JavaScript时间日期格式转换
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Date.prototype.Format = function(formatStr) { |
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var str = formatStr; |
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var Week = [‘日‘, ‘一‘, ‘二‘, ‘三‘, ‘四‘, ‘五‘, ‘六‘]; |
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str = str.replace(/yyyy|YYYY/, this.getFullYear()); |
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str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : ‘0‘ + (this.getYear() % 100)); |
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str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : ‘0‘ + (this.getMonth() + 1)); |
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str = str.replace(/M/g, (this.getMonth() + 1)); |
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str = str.replace(/w|W/g, Week[this.getDay()]); |
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str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : ‘0‘ + this.getDate()); |
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str = str.replace(/d|D/g, this.getDate()); |
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str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : ‘0‘ + this.getHours()); |
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str = str.replace(/h|H/g, this.getHours()); |
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str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : ‘0‘ + this.getMinutes()); |
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str = str.replace(/m/g, this.getMinutes()); |
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str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : ‘0‘ + this.getSeconds()); |
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str = str.replace(/s|S/g, this.getSeconds()); |
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return str |
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} |
8、原生JavaScript判断是否为数字类型
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function isDigit(value) { |
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var patrn = /^[0-9]*$/; |
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if (patrn.exec(value) == null || value == "") { |
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return false |
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} else { |
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return true |
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} |
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} |
9、原生JavaScript设置cookie值
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function setCookie(name, value, Hours) { |
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var d = new Date(); |
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var offset = 8; |
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var utc = d.getTime() + (d.getTimezoneOffset() * 60000); |
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var nd = utc + (3600000 * offset); |
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var exp = new Date(nd); |
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exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000); |
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document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;" |
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} |
10、原生JavaScript获取cookie值
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function getCookie(name) { |
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var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)")); |
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if (arr != null) return unescape(arr[2]); |
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return null |
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} |
原文：http://www.cnblogs.com/LoveOrHate/p/4310164.html