JS 禁止网页的复制粘贴以及打开F12

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//禁止用户复制粘贴     forbid(){         var noright = "";       if(!noright){         document.onselectstart=function(){return false;}; //禁止复制粘贴         window.oncontextmenu=function(){return false;} //禁止右键点击时间         window.onkeydown = window.onkeyup = window.onkeypress = function (event) { //禁止打开F12           if(event.code == 'F12'){             window.event.returnValue = false;             return false;           }         }       }       },