清单 20 中所示的方法可用来忽略 onClick 事件，只返回某个被禁用了的节点是否被单击。

The method shown in Listing 20 can be used to ignore the onClick event by simply returning if a disabled node was clicked on.

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当用户单击某个关闭的节点时，浏览器会将目标节点的onClick事件(通过气泡)传递给小组件控制器代码的主onclick处理程序。

When a user clicks on a closed node, the onClick event of the target node is bubbled up by the browser to the main onClick handler of the widget's controller code.

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