ExtJS初学遇到的问题

Question

firebug提示错误
TypeError: highlightPanelContent.defer is not a function
highlightPanelContent.defer(1200);
但我觉得没有错误啊？
    <script type="text/javascript">
        Ext.onReady(function () {            Ext.getBody().createChild({
                tag: 'div',
                id: 'mainDiv'
            });            var panel = new Ext.Panel({
                title: 'ExtJS Rocks!!',
                width: 500,
                height: 300,
                id: 'mypanel',
                html: '<h1>ExtJS</h1><p>Making life better.</p>'
            });            //使用id为mainDiv的div作为显示锚点
            panel.render('mainDiv');            var highlightPanelContent = function () {
                //得到panel
                var panel = Ext.getCmp('myPanel');
                panel.body.highlight();
            }            //1.2秒后执行
            highlightPanelContent.defer(1200);
        });
    </script>

Answer 1

 你用的extjs版中有这个方法？highlightPanelContent.defer

Answer 2

我是照着书上抄的。这里不是自定义过吗var highlightPanelContent = function () {
                //得到panel
                var panel = Ext.getCmp('myPanel');
                panel.body.highlight();
            }