open打开指定大小的窗口 不可改变大小的方法

代码如下：
大小不可改变

function keyboard(){
var top = (screen.availHeight - 400) / 2;

var left = (screen.availWidth - 600)/2;

window.open(“http://www.lvtaostudio.com”,"","resizable=no,toolbar=no,menubar=no,status=no,width=649,height=475,left="+left+",top="+top);

}

大小可以改变

function keyboard(){
var top = (screen.availHeight - 400) / 2;

var left = (screen.availWidth - 600)/2;

window.open("http://www.lvtaostudio.com"," ", "resizable=yes,toolbar=no,menubar=no,status=no,width=649,height=475,left="+left+",top="+top);

}