Going back to Listing 7, the last thing you do is register event handlers. You are registering for online and offline events.
返回到清单7，需要做的最后一件事是注册事件处理程序。
Going back to Listing 7, the last thing you do is register event handlers. You are registering for online and offline events.
返回到清单7，需要做的最后一件事是注册事件处理程序。
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