ext listening event method [primary]_YUI.Ext related

<script>function a(){alert('some thing');}Ext.onReady(function(){ <BR> Ext.get("btnAlert").addListener("click",a);//这里监听 <BR> //或者使用 <BR> Ext.get("btnAlert").on("click",a);//效果相同 <BR> });</script>