订购流程就是这样一个例子，您可以在订单处理过程中的任何时刻修改或者取消订单，直到实际完成订单为止。

One example would be an ordering process where you can modify or cancel the order at any time during the order process until the order is actually fulfilled.

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var id = setInterval(fn delay); - 与setTimeout类似，只不过它会持续地调用指定的函数（每次都有一个延时），直到timer被取消为止。

var id = setInterval(fn, delay); - Similar to setTimeout but continually calls the function (with a delay every time) until it is canceled.

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第一个订户订阅后，发布点会在消息发布到主题时将其添加到主题空间，直到最后一个订户取消订阅为止。

After the first subscriber subscribes, when messages are published to the topic, the publication point adds the messages to the topic space until the last subscriber unsubscribes.

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