js锁屏技术 功能强大完善

 //ËøÆÁ
    function CoverScreen()
    {
        var h = screen.availHeight;
        var sh = document.body.scrollHeight;
var hh=window.screen.availHeight;

        var w = screen.availWidth;
        var sw =document.body.scrollWidth;
        var dialogDiv = document.getElementById("CoverDiv");
        if(!dialogDiv)
        {
         var dialogDiv = document.createElement("div");
         dialogDiv.id="CoverDiv";
         dialogDiv.style.cssText="font-family: Arial, Helvetica, sans-serif;font-size: 12px;line-height: normal;color: #FF0000;text-transform: capitalize;height: "+sh+"px;width:"+sw+"px;padding: 5px;margin: 0px;border: 1px solid #CCCCCC;top: 0px;position:absolute;left:0px;right:0px;bottom:0px;background-color: #F0F0F0;z-Index:1000;filter: Alpha(Opacity=80);";
         dialogDiv.innerHTML="";
         document.body.appendChild(dialogDiv);
         }
         else
         {
          dialogDiv.innerHTML="";
         }
        
    }
    
    //½âËø
   function HiddenDialog()
    {
        var dialogDiv = document.getElementById("CoverDiv");
        if(dialogDiv)