阻止页面右键事件

<script>
	function addEvent(obj,sEv,fn){
		if(obj.addEventListener){
			obj.addEventListener(sEv,fn,false);
		}else{
			attachEvent(‘on‘+sEv,fn);
		}
	}

	window.onload=function(){
		addEvent(document,‘contextmenu‘,function(ev){
		     var oEvent=ev||event;
		     oEvent.preventDefault && oEvent.preventDefault();
		     return false;
		})
        }
</script>