JS实现windows.open打开窗口并居中

function openWin() {
           var url='Add.aspx';                             //转向网页的地址;
           var name='add';                            //网页名称，可为空;
           var iWidth=720;                          //弹出窗口的宽度;
           var iHeight=600;                         //弹出窗口的高度;
           //获得窗口的垂直位置
           var iTop = (window.screen.availHeight - 30 - iHeight) / 2;
           //获得窗口的水平位置
           var iLeft = (window.screen.availWidth - 10 - iWidth) / 2;
           window.open(url, name, 'height=' + iHeight + ',,innerHeight=' + iHeight + ',width=' + iWidth + ',innerWidth=' + iWidth + ',top=' + iTop + ',left=' + iLeft + ',status=no,toolbar=no,menubar=no,location=no,resizable=no,scrollbars=0,titlebar=no');
          // window.open("AddScfj.aspx", "newWindows", 'height=100,width=400,top=0,left=0,toolbar=no,menubar=no,scrollbars=no, resizable=no,location=no, status=no');
       }