Javascript数组常用方法[包含MS AJAX.NET的prototype扩展方法]示例

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>
posted @ 2008-01-26 23:31  菩提树下的杨过  阅读(1618)  评论(0编辑  收藏  举报