textarea动态改变Label

var comment = Ext.getCmp('codeModuleComment');

comment.label.update('');

 

http://forum.z27315.com/topic/3271-%E5%9B%BE%E7%89%87%E7%B2%98%E8%B4%B4%E4%B8%8A%E4%BC%A0%E7%9A%84%E5%AE%9E%E7%8E%B0/