原生js的String类扩展
<div id="cnblogs_post_body"><div class="cnblogs_code">//获取字符数组 String.prototype.toCharArray = function() { return this.split("");}//获取N个相同的字符串 String.prototype.repeat = function(num) { var tmpArr = []; for ( var i = 0; i < num; i++) tmpArr.push(this); return tmpArr.join("");}//逆序 String.prototype.reverse = function() { return this.split("").reverse().join("");}//测试是否是数字 String.prototype.isNumeric = function() { var tmpFloat = parseFloat(this); if (isNaN(tmpFloat)) return false; var tmpLen = this.length - tmpFloat.toString().length; return tmpFloat + "0".Repeat(tmpLen) == this;}//测试是否是整数 String.prototype.isInt = function() { if (this == "NaN") return false; return this == parseInt(this).toString();}// 合并多个空白为一个空白 String.prototype.resetBlank = function() { return this.replace(/s+/g, " ");}// 除去左边空白 String.prototype.LTrim = function() { return this.replace(/^s+/g, "");}// 除去右边空白 String.prototype.RTrim = function() { return this.replace(/s+$/g, "");}// 除去两边空白 String.prototype.trim = function() { return this.replace(/(^s+)|(s+$)/g, "");}// 保留数字 String.prototype.getNum = function() { return this.replace(/[^d]/g, "");}// 保留字母 String.prototype.getEn = function() { return this.replace(/[^A-Za-z]/g, "");}// 保留中文 String.prototype.getCn = function() { return this.replace(/[^u4e00-u9fa5uf900-ufa2d]/g, "");}// 得到字节长度 String.prototype.getRealLength = function() { return this.replace(/[^x00-xff]/g, "--").length;}// 从左截取指定长度的字串 String.prototype.left = function(n) { return this.slice(0, n);}// 从右截取指定长度的字串 String.prototype.right = function(n) { return this.slice(this.length - n);}// HTML编码 String.prototype.HTMLEncode = function() { var re = this; var q1 = [ /x26/g, /x3C/g, /x3E/g, /x20/g ]; var q2 = [ "&", "<", ">", " " ]; for ( var i = 0; i < q1.length; i++) re = re.replace(q1, q2); return re;}// Unicode转化 String.prototype.ascW = function() { var strText = ""; for ( var i = 0; i < this.length; i++) strText += "&#" + this.charCodeAt(i) + ";"; return strText;}
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