JS中字符串trim()使用示例

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示例一：

<head>  <title>测试JS扩展方法</title>  <script type="text/javascript">    // 合并多个空白为一个空白     String.prototype.ResetBlank = function() {    //对字符串扩展      var regEx = /\s+/g;       return this.replace(regEx, ' ');     };      window.onload = function()    {      var str = "你   在他想还好吗?";      alert(str);      str = str.ResetBlank();    //这样就能够调用了，跟C#的很像吧!      alert(str);    }  </script></head>

示例二：

// 清除两边的空格 String.prototype.trim = function() {   return this.replace(/(^\s*)|(\s*$)/g, ''); }; // 合并多个空白为一个空白 String.prototype.ResetBlank = function() {   var regEx = /\s+/g;   return this.replace(regEx, ' '); };   // 保留数字 String.prototype.GetNum = function() {   var regEx = /[^\d]/g;   return this.replace(regEx, ''); };   // 保留中文 String.prototype.GetCN = function() {   var regEx = /[^\u4e00-\u9fa5\uf900-\ufa2d]/g;   return this.replace(regEx, ''); };   // String转化为Number String.prototype.ToInt = function() {   return isNaN(parseInt(this)) ? this.toString() : parseInt(this); };   // 得到字节长度 String.prototype.GetLen = function() {   var regEx = /^[\u4e00-\u9fa5\uf900-\ufa2d]+$/;   if (regEx.test(this)) {     return this.length * 2;   } else {     var oMatches = this.match(/[\x00-\xff]/g);     var oLength = this.length * 2 - oMatches.length;     return oLength;   } };   // 获取文件全名 String.prototype.GetFileName = function() {   var regEx = /^.*\/([^\/\?]*).*$/;   return this.replace(regEx, '$1'); };   // 获取文件扩展名 String.prototype.GetExtensionName = function() {   var regEx = /^.*\/[^\/]*(\.[^\.\?]*).*$/;   return this.replace(regEx, '$1'); };   //替换所有String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) {   if (!RegExp.prototype.isPrototypeOf(reallyDo)) {     return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi" : "g")), replaceWith);   } else {     return this.replace(reallyDo, replaceWith);   } }; //格式化字符串 add By 刘景宁 2010-12-09  String.Format = function() {   if (arguments.length == 0) {     return '';   }     if (arguments.length == 1) {     return arguments[0];   }     var reg = /{(\d+)?}/g;   var args = arguments;   var result = arguments[0].replace(reg, function($0, $1) {     return args[parseInt($1) + 1];   });   return result; };   // 数字补零 Number.prototype.LenWithZero = function(oCount) {   var strText = this.toString();   while (strText.length < oCount) {     strText = '0' + strText;   }   return strText; };   // Unicode还原 Number.prototype.ChrW = function() {   return String.fromCharCode(this); };   // 数字数组由小到大排序 Array.prototype.Min2Max = function() {   var oValue;   for (var i = 0; i < this.length; i++) {     for (var j = 0; j <= i; j++) {       if (this[i] < this[j]) {         oValue = this[i];         this[i] = this[j];         this[j] = oValue;       }     }   }   return this; };   // 数字数组由大到小排序 Array.prototype.Max2Min = function() {   var oValue;   for (var i = 0; i < this.length; i++) {     for (var j = 0; j <= i; j++) {       if (this[i] > this[j]) {         oValue = this[i];         this[i] = this[j];         this[j] = oValue;       }     }   }   return this; };   // 获得数字数组中最大项 Array.prototype.GetMax = function() {   var oValue = 0;   for (var i = 0; i < this.length; i++) {     if (this[i] > oValue) {       oValue = this[i];     }   }   return oValue; };   // 获得数字数组中最小项 Array.prototype.GetMin = function() {   var oValue = 0;   for (var i = 0; i < this.length; i++) {     if (this[i] < oValue) {       oValue = this[i];     }   }   return oValue; };   // 获取当前时间的中文形式 Date.prototype.GetCNDate = function() {   var oDateText = '';   oDateText += this.getFullYear().LenWithZero(4) + new Number(24180).ChrW();   oDateText += this.getMonth().LenWithZero(2) + new Number(26376).ChrW();   oDateText += this.getDate().LenWithZero(2) + new Number(26085).ChrW();   oDateText += this.getHours().LenWithZero(2) + new Number(26102).ChrW();   oDateText += this.getMinutes().LenWithZero(2) + new Number(20998).ChrW();   oDateText += this.getSeconds().LenWithZero(2) + new Number(31186).ChrW();   oDateText += new Number(32).ChrW() + new Number(32).ChrW() + new Number(26143).ChrW() + new Number(26399).ChrW() + new String('26085199682010819977222352011620845').substr(this.getDay() * 5, 5).ToInt().ChrW();   return oDateText; }; //扩展Date格式化 Date.prototype.Format = function(format) {   var o = {     "M+": this.getMonth() + 1, //月份          "d+": this.getDate(), //日          "h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, //小时          "H+": this.getHours(), //小时          "m+": this.getMinutes(), //分          "s+": this.getSeconds(), //秒          "q+": Math.floor((this.getMonth() + 3) / 3), //季度          "S": this.getMilliseconds() //毫秒        };   var week = {     "0": "\u65e5",     "1": "\u4e00",     "2": "\u4e8c",     "3": "\u4e09",     "4": "\u56db",     "5": "\u4e94",     "6": "\u516d"  };   if (/(y+)/.test(format)) {     format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));   }   if (/(E+)/.test(format)) {     format = format.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "\u661f\u671f" : "\u5468") : "") + week[this.getDay() + ""]);   }   for (var k in o) {     if (new RegExp("(" + k + ")").test(format)) {       format = format.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));     }   }   return format; } Date.prototype.Diff = function(interval, objDate) {   //若参数不足或 objDate 不是日期类型則回传 undefined   if (arguments.length < 2 || objDate.constructor != Date) { return undefined; }   switch (interval) {     //计算秒差                                 case 's': return parseInt((objDate - this) / 1000);       //计算分差     case 'n': return parseInt((objDate - this) / 60000);       //计算時差     case 'h': return parseInt((objDate - this) / 3600000);       //计算日差     case 'd': return parseInt((objDate - this) / 86400000);       //计算周差     case 'w': return parseInt((objDate - this) / (86400000 * 7));       //计算月差     case 'm': return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1);       //计算年差     case 'y': return objDate.getFullYear() - this.getFullYear();       //输入有误     default: return undefined;   } };   //检测是否为空 Object.prototype.IsNullOrEmpty = function() {   var obj = this;   var flag = false;   if (obj == null || obj == undefined || typeof (obj) == 'undefined' || obj == '') {     flag = true;   } else if (typeof (obj) == 'string') {     obj = obj.trim();     if (obj == '') {//为空       flag = true;     } else {//不为空       obj = obj.toUpperCase();       if (obj == 'NULL' || obj == 'UNDEFINED' || obj == '{}') {         flag = true;       }     }   }   else {     flag = false;   }   return flag;

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