响应时间是门户或者站点对请求做出响应所花费的时间。
Response time is the time it takes for the portal or site to respond to the request.
所有这些方法和常量应该会使得对按钮事件做出响应更加容易。
All these methods and constants should make responding to button events easier.
要构建对用户操作做出响应的代码，就需要编写在操作发生时执行的代码。
Building the code to respond to a user's actions consists of writing code to act upon that action.
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