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Aug 24, 2017
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update zh/universal.md #118

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## 组件生命周期钩子函数

由于没有动态更新，所有的生命周期钩子函数中，只有 `beforeCreate` 和 `created` 会在服务器端渲染(SSR)过程中被调用。这就是说任何其他声明周期钩子函数中的代码（例如 `beforeMount` 或 `mounted`），只会在客户端执行。
由于没有动态更新，所有的生命周期钩子函数中，只有 `beforeCreate` 和 `created` 会在服务器端渲染(SSR)过程中被调用。这就是说任何其他生命周期钩子函数中的代码（例如 `beforeMount` 或 `mounted`），只会在客户端执行。

此外还需要注意的是，你应该避免在 `beforeCreate` 和 `created` 生命周期时产生全局副作用的代码，例如在其中使用 `setInterval` 设置 timer。在纯客户端(client-side only)的代码中，我们可以设置一个 timer，然后在 `beforeDestroy` 或 `destroyed` 生命周期时将其销毁。但是，由于在 SSR 期间并不会调用销毁钩子函数，所以 timer 将永远保留下来。为了避免这种情况，请将副作用代码移动到 `beforeMount` 或 `mounted` 生命周期中。

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