JavaScript 扩展方法

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JS扩展方法与C#的扩展方法非常相似，也是可以链式调用的，也是通过对某个类的扩展写法来实现。这个东西非常好用，如果将预先写好的方法放到一个js里面引用的话，那么后面写js将非常有趣。
// 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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