extjs 创建多个实例

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Ext.onReady(function() {    var html = '<p>测试数据.</p>';        var configs = [{        title: 'Basic Panel',        collapsible:true,        width:400,        html: html    },{        width: 320,        height: 320,        title: 'Masked Panel with a really long title',        bodyStyle: "padding: 5px;",        html: 'Some content',          }];        Ext.each(configs, function(config) {   //循环迭代 configs         var element = Ext.getBody().createChild({cls: 'panel-container'});//创建一个子窗口                Ext.createWidget('panel', Ext.apply(config, {            renderTo: element,            bodyPadding: 7        }));    });});