浏览器获取电脑屏幕的像数打开新的页面

function xxxx(){
var windowHeight=window.screen.height-120;
var windowWeight=window.screen.width-100;
var windowLeft=(window.screen.width-windowWeight)/2;	 
var openlocation="xxx/xxxx.jsp?";

//window.open("xxx/xxxx.jsp?");

window.open(openlocation,"_blank","top=20,left="+windowLeft+",width="+windowWeight+", height="+windowHeight+", toolbar=no,"+
"menubar=no,scrollbars=no, resizable=no,location=no, status=no"); 
}

打开的独立的新页面 居中显示