仅使用JavaScript进行图片的预加载 

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta http-equiv="X-UA-Compatible" content="IE=edge">
 6     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 7     <title>Document</title>
 8 </head>
 9 <body>
10     <div id="preload1"></div>
11     <div id="preload2"></div>
12     <div id="preload3"></div>
13     <div id="preload4"></div>
14     <script>
15         //将需要加载的图片封装到函数中
16         function preLoad(){
17             //实例化图片对象
18             var img1=new Image();
19             var img2=new Image();
20             var img3=new Image();
21             var img4=new Image();
22 
23             //为实例化后的图片添加属性
24             img1.src='./images/001.jpg'
25             img2.src='./images/002.jpg'
26             img3.src='./images/003.jpg'
27             img4.src='./images/004.jpg'
28         }
29         //监听页面是否完成，页面完成才进行预加载
30         function addEvent(fn){
31             var load=window.onload;
32             if(typeof load=='function'){
33                 load=fn
34             }else{
35                 if(load){
36                     load()
37                 }
38                 fn()
39             }
40         }
41         addEvent(preLoad)
42     </script>
43 </body>
44 </html>

 

posted @ 2021-03-07 16:28  东功  阅读(89)  评论(0)    收藏  举报