<script language="javascript">
function imgdragstart(){return false;}
</script>
<script language="javascript">
for(i in document.images)document.images[i].ondragstart=imgdragstart;
</script>
或直接在body写就行了<body ondragstart="return false">
原文：http://www.cnblogs.com/bigdesign/p/5085239.html