Array.prototype.add = function(item){

         this.push(item);

     }

     Array.prototype.addRange = function(items){

         var length = items.length;

         if(length!=0){

             for (var index = 0; index < length; index++) {

                 this.push(items[index]);

             }

         }

     }

     Array.prototype.clear = function(){

         if(this.length>0){

             this.splice(0,this.length);

         }

     }

     Array.prototype.isEmpty = function(){

         if(this.length == 0){

             return true;

         }

         else{

             return false;

         }

     }

     Array.prototype.clone = function(){

         var clonedArray = [];

         var length = this.length;

         for (var index = 0; index < length; index++) {

             clonedArray[index] = this[index];

         }

         return clonedArray;

     }

     Array.prototype.contains = function(item){

         var index = this.indexOf(item);

         return (index>=0);

     }

     Array.prototype.dequeue = function(){

         return this.shift();

     }

     Array.prototype.indexOf = function(item){

         var length = this.length;

         if(length!=0){

             for (var index = 0; index < length; index++) {

                 if(this[index] == item){

                     return index;

                 }

             }

         }

         return -1;

     }

     Array.prototype.insert = function(index,item){

         this.splice(index,0,item);

     }

     Array.prototype.joinstr = function(str){

         var newStr = new Array(this.length);

         for (var i = 0; i < this.length; i++) {

             newStr[i] = this[i]+str;

         }

         return newStr;

     }

     Array.prototype.queue = function(item){//入队

         this.push(item);

     }

     Array.prototype.remove = function(item){

         var index = this.indexOf(item);

         if(index >= 0){

             this.splice(index,1);

         }

     }

     Array.prototype.removeAt = function(index){

         this.splice(index,1);

     }

     //给js原生Array增加each方法

     Array.prototype.each = function(fn)

     {

         return this.length ? [fn(this.slice(0,1))].concat(this.slice(1).each(fn)) : [];

     };

     [1,2,3,4].each(function(x){

         document.write(x + "<br/>");

     });

    //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++) {

            temArr.push(this);

            return temArr.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[i], q2[i]);

    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;

}