如果希望创建其他类型的触发器，可单击信封图标旁边的下箭头，显示其他选项。

If we'd wanted to create a different kind of trigger, we'd have clicked on the down arrow next to the envelope to reveal additional choices.

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为了添加Message事件触发器，请单击蓝色小信封图标。

To add a Message event trigger we click on the small blue envelope.

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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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