JS图片赖加载例子

2018-06-24 00:31:50来源：未知阅读 ()

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no">
 6     <title>图片赖加载2017-10-17</title>
 7     <style type="text/css">
 8         *{padding: 0;margin: 0}
 9         img{width: 100%;display: block;}
10     </style>
11 </head>
12 <body>
13     <div class="lazy-img">
14         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="https://a-ssl.duitang.com/uploads/item/201210/24/20121024113044_vkmru.jpeg">
15         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://img01.sogoucdn.com/app/a/100540002/422283.jpg">
16         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2013/08/09/357253.jpg">
17         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://img01.sogoucdn.com/app/a/100540002/422289.jpg">
18         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2015/05/29/1184364.jpg">
19         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2015/01/27/1063571.jpg">
20         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2014/07/16/733793.jpg">
21         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2014/11/11/957398.jpg">
22         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://img.bizhi.sogou.com/images/2013/09/22/387997.jpg">
23         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://img.bizhi.sogou.com/images/2015/04/28/1159147.jpg">
24         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2015/06/01/1186941.jpg">
25         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2013/07/19/348659.jpg">
26         <img class="jsLoadImg" src="https://h5.quanchepin.com/templates/images/loadImg.png" data-src="http://dl.bizhi.sogou.com/images/2013/07/19/348291.jpg">
27     </div>
28 <!-- <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script> -->
29 <script type="text/javascript">
30     // 图片赖加载js代码
31     window.Echo=(function(window,document,undefined){'use strict';var store=[],offset,throttle,poll;var _inView=function(el){var coords=el.getBoundingClientRect();return((coords.top>=0&&coords.left>=0&&coords.top)<=(window.innerHeight||document.documentElement.clientHeight)+parseInt(offset));};var _pollImages=function(){for(var i=store.length;i--;){var self=store[i];if(_inView(self)){self.src=self.getAttribute('data-src');store.splice(i,1);}}};var _throttle=function(){clearTimeout(poll);poll=setTimeout(_pollImages,throttle);};var init=function(obj){var nodes=document.querySelectorAll('[data-src]');var opts=obj||{};offset=opts.offset||0;throttle=opts.throttle||250;for(var i=0;i<nodes.length;i++){store.push(nodes[i]);}_throttle();if(document.addEventListener){window.addEventListener('scroll',_throttle,false);}else{window.attachEvent('onscroll',_throttle);}};return{init:init,render:_throttle};})(window,document);
32 
33     Echo.init({
34         offset: 100,//离可视区域多少像素的图片可以被加载
35         throttle: 0,//图片延时多少毫秒加载
36         els: '.jsLoadImg',
37         elP: '.lazy-img',
38         dataSrc: 'data-src'
39     });
40 </script>
41 </body>
42 </html>