网页中屏蔽右键,不允许选择文本.兼容IE,Firefox

<style>
body {
-moz-user-select : none;
}
</style>
<script>
document.oncontextmenu=function(e){return false;}
window.onload = function(){
document.body.onmouseup = function (){document.selection.empty();};
document.body.oncontextmenu = function () {return false;};
document.body.onselectstart = function () {return false;};
document.body.onselect = function () {document.selection.empty()};
}
</script>