标记加载后，会执行回调函数，并通过回调函数的参数把从服务返回的信息传递给该回调函数。
When the tag loads, the callback function executes, and the information returned from the server passes to it through its arguments.
在每一个定时器事件被调用时该state对象作为一个参数传递给你的定时回调函数。
This state object is passed to your timer callback function during each timer event invocation.
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