easyui window自动居中(修复了iframe弹窗被遮盖问题)

 $.extend($.fn.window.defaults, {
         onOpen: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({
                 left: setWidth,
                 top: setHeight
             });
             if (iframeHeight < windowHeight)
             {
                 $(this).parent().css({
                     left: setWidth,
                     top: 0
                 });
             }
             $(".window-shadow").hide();
         }
 });