扩展原生js的一些方法

 1     Array.prototype.add = function(item){
 2         this.push(item);
 3     }
 4     Array.prototype.addRange = function(items){
 5         var length = items.length;
 6         if(length!=0){
 7             for (var index = 0; index < length; index++) {
 8                 this.push(items[index]);
 9                 
10             }
11         }
12     }
13     Array.prototype.clear = function(){
14         if(this.length>0){
15             this.splice(0,this.length);
16         }
17     }
18     Array.prototype.isEmpty = function(){
19         if(this.length == 0){
20             return true;
21         }
22         else{
23             return false;
24         }
25     }
26     Array.prototype.clone = function(){
27         var clonedArray = [];
28         var length = this.length;
29         for (var index = 0; index < length; index++) {
30             clonedArray[index] = this[index];
31         }
32         return clonedArray;
33     }
34     Array.prototype.contains = function(item){
35         var index = this.indexOf(item);
36         return (index>=0);
37     }
38     Array.prototype.dequeue = function(){
39         return this.shift();
40     }
41     Array.prototype.indexOf = function(item){
42         var length = this.length;
43 
44         if(length!=0){
45             for (var index = 0; index < length; index++) {
46                 if(this[index] == item){
47                     return index;
48                 }
49             }
50         }
51         return -1;
52     }
53     Array.prototype.insert = function(index,item){
54         this.splice(index,0,item);
55     }
56     Array.prototype.joinstr = function(str){
57         var newStr = new Array(this.length);
58         for (var i = 0; i < this.length; i++) {
59             newStr[i] = this[i]+str;
60         }
61         return newStr;
62     }
63     Array.prototype.queue = function(item){//入队
64         this.push(item);
65     }
66     Array.prototype.remove = function(item){
67         var index = this.indexOf(item);
68         if(index >= 0){
69             this.splice(index,1);
70         }
71     }
72     Array.prototype.removeAt = function(index){
73         this.splice(index,1);
74     }
75     //给js原生Array增加each方法
76     Array.prototype.each = function(fn)
77     {
78         return this.length ? [fn(this.slice(0,1))].concat(this.slice(1).each(fn)) : [];
79     };
80     
81     [1,2,3,4].each(function(x){
82         document.write(x + "<br/>");
83     });

    //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;
}