Extj报错 小弟实在找不出问题 特请大神相助

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信息管理系统界面

<pre><code>var Ext; Ext.onReady(function(){ Ext.create(&#39;Ext.panel.Panel&#39;, { width: 500, height: 300, title: &#39;Border Layout&#39;, layout: &#39;border&#39;, items: [{ title: &#39;South Region is resizable&#39;, region: &#39;south&#39;, // position for region xtype: &#39;panel&#39;, height: 100, split: true, // enable resizing margin: &#39;0 5 5 5&#39; },{ // xtype: &#39;panel&#39; implied by default title: &#39;West Region is collapsible&#39;, region:&#39;west&#39;, xtype: &#39;panel&#39;, margin: &#39;5 0 0 5&#39;, width: 200, collapsible: true, // make collapsible id: &#39;west-region-container&#39;, layout: &#39;fit&#39; },{ title: &#39;Center Region&#39;, region: &#39;center&#39;, // center region is required, no width/height specified xtype: &#39;panel&#39;, layout: &#39;fit&#39;, margin: &#39;5 5 0 0&#39; }], renderTo: &#39;f1&#39; </code></pre> <p>});</p> <p>});<br>