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javascript也来玩玩图片预加载_javascript技巧

时间：2021-07-01 10:21:17 帮助过：33人阅读

作者：编程浪子
最近玩图片预加载的人好像特别多，我也来一个，个人比较懒，只在IE上调试，大家就当无聊聊玩玩吧

<html> 
<head> 
<title>IE图片预加载类</title> 
<script language="javascript"> 
function LoadImageClass() 
{ 
    var me = this; 
    var a = [];    //图片数组 
    this.Idx = 0;    //已经被加载的图片个数 
    this.Num = 0;    //图片总数

//下载图片 
    this.LoadImages = function(s) 
    { 
        a = s.split(","); 
        this.Num = a.length; 
        DownImg(); 
    }

function DownImg() 
    { 
        var i=new Image(); 
        var f = true; 
        i.onload= function() 
        { 
            if (f) 
            { 
                f = false 
                me.Idx++; 
                if (me.LoadIng) me.LoadIng(); 
                if (me.Idx<me.Num) DownImg(); 
                else if(me.CallBack) me.CallBack(a); 
            } 
        } 
        i.src = a[me.Idx]; 
    } 
} 
</ script> 
</head> 
<body> 
<div id="counter" style="position:absolute; z-index:98; left:expression(document.body.clientWidth/2-60); top:expression(document.body.clientHeight/2-10); width:120px; height:20px; background:#000000; color:#ffffff;">图片加载中...</div> 
<div id="divPageMask" style="position:absolute; z-index:99; left:0px; top:0px; width:expression(document.body.clientWidth); height:expression(document.body.clientHeight); background:black; filter:alpha(opacity=50);"></div> 
<div id="box"></div>

<script language="javascript"> 
    var o = document.getElementById("counter"); 
    var t=new LoadImageClass(); 
    t.LoadIng = function() { o.innerHTML="加载进度："+Math.floor(t.Idx/t.Num*100)+"%" }; 
    t.CallBack = function(arr) 
    { 
        window.setTimeout(function(){o.style.display='none';alert('图片加载完毕！')},1000); 
        document.getElementById('divPageMask').style.display='none'; 
        var str=""; 
        for(var i=0;i
'; 
        } 
        document.getElementById("box").innerHTML=str; 
    } 
    t.LoadImages('http://www.baidu.com/img/logo-yy.gif,http://bbs.51js.com/images/default/logo.gif,http://www.programbbs.com/bbs/uploadFace/46_2006910934216927.gif,http://photo.hjbbs.com/photo/20060531/20060531103027226_756_o.jpg,http://img1.soufun.com/bbs/2007_02/13/1171345302199.jpeg,http://img.c8c8.cn/2006/09/09/15032/pp20060909002749.jpg'); 
</ script> 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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