当检测到点击时，页面回传并激发这个点击事件。
When a click is detected, the page posts back and fires the click event.
相反，它回传了其响应，而这一点非常重要。
Rather, it echoes its response, and this is an important point.
当用户在菜单项上点击时，页面回传并引发服务器端事件。
When the user clicks on any of the menu's menu items, the page posts back and raises a server-side event.
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