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<script type="text/javascript">
function loadImg(){
var pics = document.getElementsByTagName(‘IMG‘);
for(var i=0;i<pics.length;i++){
pics[i].src = pics[i].attributes[‘lazy_src‘].value;
}
}
</script>
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<body style="text-align:center">
<p>
<input type="button" value="加载" onclick="loadImg();"/>
</p>
<img lazy_src="1.jpg" src=""/>
</body>
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原文：http://www.cnblogs.com/hanxuming/p/5920405.html