When using AJAX in a web application then how to generate the HTML or HTML fragment when a user event occurs on the screen?

在Web应用中使用AJAX后，当窗口上发生用户事件时如何产生HTML或HTML片断？

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This means you can catch the user event in a class that you know works and then pass it through for processing to the class you're developing.

这意味着你可以捕捉类里的用户事件，因为你知道这个类是怎么工作的；然后再将其传递到类里进行处理。

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Target-Action: The mechanism that enables a view object to present a control in response to a user event; for example, a click to send the action message to the target object.

Target-Action：该机制支持视图对象呈现一个控制，响应一个用户事件；例如，单击发送活动消息到目标对象。

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