button phase 钮期
For example, let's say the user clicks a button that is bound to an action method, which gets invoked during the invoke application phase (refer back to Figure 1 for details).
例如，假定用户单击了绑定到某个操作方法的按钮，那么就会在调用应用程序阶段调用这个方法(有关的细节，请参见上面的图1)。
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