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Javascript数组MS AJAX.NET的prototype扩展

看了JefferyZhao的MSDN web cast视频教程,亲自实践了一下,代码如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Javascript Array常用方法示例</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <div id="_display">
        </div>
        
        <script type="text/javascript">
            function display(str)
            {
                $get("_display").innerHTML += str + "<br/>";
            }            
            
            Array.prototype.display = function(){
                display("  a: " + this.toString());
            }
            
            var a = [1,2,3,4,5,6,7,8];
            
            display("a.toString()");
            a.display();//1,2,3,4,5,6,7,8
            
            display("a.push(9)");
            a.push(9);
            a.display();//1,2,3,4,5,6,7,8,9          
            
            display("a.shift()");
            a.shift();
            a.display();//2,3,4,5,6,7,8,9 利用push和shift可以模拟一个queue
            
            
            display("a.unshift(1)");
            a.unshift(1);
            a.display();//0,2,3,4,5,6,7,8,9
            
            display("a.pop()");
            a.pop();
            a.display();//1,2,3,4,5,6,7,8
            
            display("a.slice(2,5) = " + a.slice(2,5));//3,4,5 取下标2到5之间的元素(包含下标2)
            a.display()
            
            display("a.slice(2,-2) = " + a.slice(2,-2));//3,4,5,6 取下标2到倒数第二个元素之间的所有元素(包含下标2)
            a.display();
            
            display("a.concat('a','b') = " +  a.concat('a','b'));//1,2,3,4,5,6,7,8,a,b
            a.display();
            
            display("'[' + a.join('][') + ']' = " + '[' + a.join('][') + ']') ;//[1][2][3][4][5][6][7][8]
            a.display();
            
            display("a.splice(3,2) = " + a.splice(3,2));
            a.display();//1,2,3,6,7,8 从下标3开始删除了二个元素
            
            display("a.splice(3,0,4,5)");
            a.splice(3,0,4,5);
            a.display();//1,2,3,4,5,6,7,8 从下标3开始,删除0个元素,再插入4,5这二个元素,呵呵,同一个方法,即能删除,又能插入,是不是有点意外          
          
            display("a.splice(3,2,'a','b','c',9,10)");
            a.splice(3,2,'a','b','c',9,10);
            a.display();//1,2,3,a,b,c,9,10,6,7,8 从下标3开始,删除2个元素,再插入a,b,c,9,10这三个元素,相当于替换元素
            
            display("a.reverse()");
            a.reverse();//8,7,6,10,9,c,b,a,3,2,1
            a.display();
            
            display("a.sort()");
            a.sort();
            a.display();//1,10,2,3,6,7,8,9,a,b,c 注意,这里默认是按字符串来排序的
            
            display("a = [1,2,3,4,5,6,7,8,9,10,11,12];")
            a = [1,2,3,4,5,6,7,8,9,10,11,12];
            a.display();
            display("a.sort(function(x,y){return y-x});")
            a.sort(function(x,y){return y-x});//倒序排列
            a.display();//12,11,10,9,8,7,6,5,4,3,2,1 
            
            display("<hr/>以下方法是MS Ajax.Net扩展Array的Prototype得到的新方法<hr/>");
            
            display("Array.enqueue(a,\"a\")")
            Array.enqueue(a,"a");//入队列
            a.display();//12,11,10,9,8,7,6,5,4,3,2,1,a 
            
            display("Array.dequeue(a)")
            Array.dequeue(a);//出队列
            a.display();//11,10,9,8,7,6,5,4,3,2,1,a
            
            var b = ['hello','world'];
            display("var b = ['hello','world'];");
            
            display("Array.addRange(a,b)")
            Array.addRange(a,b);
            a.display();
            
            display("Array.contains(a,'hello')");
            display(Array.contains(a,'hello'));//true,a数组中是否包含元素hello
            
            display("Array.insert(a,0,'hi')");
            Array.insert(a,0,'hi');//在下标0处插入元素hi
            a.display();//hi,11,10,9,8,7,6,5,4,3,2,1,a,hello,world
            
            display("Array.remove(a,\"hello\")")
            Array.remove(a,"hello");
            a.display();
            
            display("Array.removeAt(0)");
            Array.removeAt(a,0);//删除下标0的元素
            a.display();//11,10,9,8,7,6,5,4,3,2,1,a,world
            
            display("var c = Array.clone(a);") ;
            var c = Array.clone(a);
            display("c=" + c);
            
            display("var d = Array.parse(\"[1,2,3,4,5]\")")
            var d = Array.parse("[1,2,3,4,5]");
            display("d.length=" + d.length);
            
            display("Array.indexOf(a,'world')=" + Array.indexOf(a,'world'));
            
            
            display("Array.add(a,\"X-man\")")
            Array.add(a,"X-man");//效果等同于enqueue方法
            a.display();//11,10,9,8,7,6,5,4,3,2,1,a,world,X-man
            
            
            var obj = {result:""};
            
            function newMethod(item,index,array)
            {
                this.result += "[" + index + ":" + item + "]";//将数组每个元素组合成“[下标:值]”的字符串返回给obj.result
                array[index] = 'x' + array[index];//将数组每个元素前加一个'x'
            }
            
            Array.forEach(a,newMethod,obj);          
            display("Array.forEach(a,newMethod,obj)");
            display(obj.result);//[0:11][1:10][2:9][3:8][4:7][5:6][6:5][7:4][8:3][9:2][10:1][11:a][12:world][13:X-man]
            display(a);//x11,x10,x9,x8,x7,x6,x5,x4,x3,x2,x1,xa,xworld,xX-man
            
            display("Array.clear(a)");
            Array.clear(a);
            a.display();
            
            

         
            
        </script>
    </form>
</body>
</html>


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