Easyui 让Window弹出居中

//让window居中
var easyuiPanelOnOpen = function (left, top) {
    var iframeWidth = $(this).parent().parent().width();
   
    var iframeHeight = $(this).parent().parent().height();

    var windowWidth = $(this).parent().width();
    var windowHeight = $(this).parent().height();

    var setWidth = (iframeWidth - windowWidth) / 2;
    var setHeight = (iframeHeight - windowHeight) / 2;
    $(this).parent().css({/* 修正面板位置 */
        left: setWidth,
        top: setHeight
    });

    if (iframeHeight < windowHeight)
    {
        $(this).parent().css({/* 修正面板位置 */
            left: setWidth,
            top: 0
        });
    }
    $(".window-shadow").hide();
};
$.fn.window.defaults.onOpen = easyuiPanelOnOpen;