理想情况下，这两个函数的使用应该限于对界面的拖放，因为这种情况下单击不会有合适的替代。
Ideally, the use of these two functions should be limited to dragging and dropping interfaces, where the click would not make a suitable replacement.
作为应用程序开发人员，可以将精力放在构建用户界面和服务器中执行的函数上。
As an application developer, you can focus on building the user interface and the functions that are executed on the server.
一旦数据进入了常规化的结构，就可以被传递给一个公共函数来更新用户界面。
Once the data is in a normalized structure, it can be passed to a common function for updating the user interface.
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