图片懒加载

来源：互联网发布：中超数据服务商编辑：程序博客网时间：2024/06/01 12:40
<!DOCTYPE html><html lang="en">  <head> <meta charset="UTF-8"> <title>图片懒加载(可视区域加载)</title> <style>  * {  padding: 0px;  margin: 0px;  }     html,  body {  width: 100%;  min-height: 100%;  }     #SB {  margin: 0;  padding: 0;  list-style: none;  }     #SB .in {  border: 1px solid red;  margin: 10px;  text-align: center;  height: 400px;  width: 400px;  float: left;  }     .in img {  border: none;  vertical-align: middle;  height: 400px;  width: 400px;  } </style> </head>  <body> <ul>  <li class="in"><img src="" data-imgurl="img/1.jpg"></li>  <li class="in"><img src="" data-imgurl="img/2.jpg"></li>  <li class="in"><img src="" data-imgurl="img/3.jpg"></li>  <li class="in"><img src="" data-imgurl="img/4.jpg"></li>  <li class="in"><img src="" data-imgurl="img/5.jpg"></li>  <li class="in"><img src="" data-imgurl="img/6.jpg"></li>  <li class="in"><img src="" data-imgurl="img/7.jpg"></li>  <li class="in"><img src="" data-imgurl="img/8.jpg"></li>  <li class="in"><img src="" data-imgurl="img/9.jpg"></li>  <li class="in"><img src="" data-imgurl="img/10.jpg"></li>  <li class="in"><img src="" data-imgurl="img/11.jpg"></li>  <li class="in"><img src="" data-imgurl="img/12.jpg"></li>  <li class="in"><img src="" data-imgurl="img/13.jpg"></li>  <li class="in"><img src="" data-imgurl="img/14.jpg"></li>  <li class="in"><img src="" data-imgurl="img/15.jpg"></li>  <li class="in"><img src="" data-imgurl="img/16.jpg"></li>  <li class="in"><img src="" data-imgurl="img/1.jpg"></li>  <li class="in"><img src="" data-imgurl="img/2.jpg"></li>  <li class="in"><img src="" data-imgurl="img/3.jpg"></li>  <li class="in"><img src="" data-imgurl="img/4.jpg"></li>  <li class="in"><img src="" data-imgurl="img/5.jpg"></li>  <li class="in"><img src="" data-imgurl="img/6.jpg"></li>  <li class="in"><img src="" data-imgurl="img/7.jpg"></li>  <li class="in"><img src="" data-imgurl="img/8.jpg"></li>  <li class="in"><img src="" data-imgurl="img/9.jpg"></li>  <li class="in"><img src="" data-imgurl="img/10.jpg"></li>  <li class="in"><img src="" data-imgurl="img/11.jpg"></li>  <li class="in"><img src="" data-imgurl="img/12.jpg"></li>  <li class="in"><img src="" data-imgurl="img/13.jpg"></li>  <li class="in"><img src="" data-imgurl="img/14.jpg"></li>  <li class="in"><img src="" data-imgurl="img/15.jpg"></li>  <li class="in"><img src="" data-imgurl="img/16.jpg"></li>  <li class="in"><img src="" data-imgurl="img/1.jpg"></li>  <li class="in"><img src="" data-imgurl="img/2.jpg"></li>  <li class="in"><img src="" data-imgurl="img/3.jpg"></li>  <li class="in"><img src="" data-imgurl="img/4.jpg"></li>  <li class="in"><img src="" data-imgurl="img/5.jpg"></li>  <li class="in"><img src="" data-imgurl="img/6.jpg"></li>  <li class="in"><img src="" data-imgurl="img/7.jpg"></li>  <li class="in"><img src="" data-imgurl="img/8.jpg"></li>  <li class="in"><img src="" data-imgurl="img/9.jpg"></li>  <li class="in"><img src="" data-imgurl="img/10.jpg"></li>  <li class="in"><img src="" data-imgurl="img/11.jpg"></li>  <li class="in"><img src="" data-imgurl="img/12.jpg"></li>  <li class="in"><img src="" data-imgurl="img/13.jpg"></li>  <li class="in"><img src="" data-imgurl="img/14.jpg"></li>  <li class="in"><img src="" data-imgurl="img/15.jpg"></li>  <li class="in"><img src="" data-imgurl="img/16.jpg"></li> </ul> <script type="text/javascript">  var aImages = document.getElementByTagName("ul").getElementsByTagName('img'); //所有的图片  loadImg(aImages);  window.onscroll = function() { //滚动条滚动触发  loadImg(aImages);  };  //getBoundingClientRect 是图片懒加载的核心  function loadImg(arr) {  for(var i = 0, len = arr.length; i < len; i++) {   if(arr[i].getBoundingClientRect().top < document.documentElement.clientHeight && !arr[i].isLoad) {   arr[i].isLoad = true; //图片显示标志位   //arr[i].style.cssText = "opacity: 0;";    (function(i) {    setTimeout(function() {    if(arr[i].dataset) { //兼容不支持data的浏览器     aftLoadImg(arr[i], arr[i].dataset.imgurl);    } else {     aftLoadImg(arr[i], arr[i].getAttribute("data-imgurl"));    }    arr[i].style.cssText = "transition: 1s; opacity: 1;" //相当于fadein    }, 500)   })(i);   }  }  }   function aftLoadImg(obj, url) {  var oImg = new Image();  oImg.onload = function() {   obj.src = oImg.src; //下载完成后将该图片赋给目标obj目标对象  }  oImg.src = url; //oImg对象先下载该图像  } </script> </body> </html>
还可以使用jq的插件
jquery.lazyload.min.js
然后在页面上这样调用
$(function(){
$("img").lazyload();
})’
将图片的src换成data-original就可以了
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