标记创建这样的触发器：当用户单击时，该触发器会调用在标记内定义的操作。

The tag creates a trigger that, when clicked by the user, invokes the action defined within the tag.

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属性触发器的“主体”是标记，而不是代码。

The "body" of a property trigger is not code, it is markup.

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此属性只报告在标记或代码中按文字原样添加到该集合的触发器集合。

It only reports the collection of triggers that are literally added to the collection, either in markup or code.

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