html 弹出窗口居中显示

var top = (screen.height-300)/2; 
var left = (screen.width-450)/2;
window.open(‘lzjs.html’,’new’,’height=320,width=450,menubar=no,location=no,top=’+top+’,left=’+left);

其中450,300是弹出窗口的宽和高

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