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/gist:7e4bc54b133ccb7d70023de0a059e3a7

Created September 2, 2017 05:35
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gistfile1.txt
<html>
<head>
<style> img{ display:block; width:300px; height:300px; } </style>
</head>
<body>
<input class="btn" type="button" value="删除" />
<script>
var imgs = document.getElementsByTagName("img"); var lenght = document.getElementsByTagName("img").length; var n = 0; lazyload(); window.onscroll = lazyload; function lazyload(){ var seeheight = document.documentElement.clientHeight var scrolltop = document.documentElement.scrollTop || document.body.scrollTop;
for (var i = n;i<lenght;i++){ if(imgs[i].offsetTop < seeheight + scrolltop ){ if (imgs[i].getAttribute("src")==="default.jpg"){ imgs[i].src = imgs[i].getAttribute("data-src") } n = i+1; } } } </script>
</body>
</html>
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