怎样在js代码里面实现防止趴网站的效果

css:

body {

-moz-user-select : none;

-webkit-user-select: none;

}

js:

function iEsc(){ return false; }

function iRec(){ return true; }

function DisableKeys() {

if(event.ctrlKey || event.shiftKey || event.altKey)  {

window.event.returnValue=false;

iEsc();}

}

document.ondragstart=iEsc;

document.onkeydown=DisableKeys;

document.oncontextmenu=iEsc;

if (typeof document.onselectstart !="undefined")

document.onselectstart=iEsc;

else{//qsyz.net

document.onmousedown=iEsc;

document.onmouseup=iRec;

}

function DisableRightClick(www_qsyz_net){

if (window.Event){

if (www_qsyz_net.which == 2 || www_qsyz_net.which == 3)

iEsc();}

else

if (event.button == 2 || event.button == 3){

event.cancelBubble = true

event.returnValue = false;

iEsc();}

}