JS屏蔽鼠标右键功能

 window.onload =function () {

           document.body.oncontextmenu = function () {window.event.returnValue =false };

           document.body.onselectstart = function () {returnfalse };

           document.body.oncopy =function () {returnfalse };

           document.body.oncut = function () {returnfalse };

       }