To begin with, look at how to use localStorage to store the tweets locally.

首先来看如何使用 localStorage 来本地存储 tweet。

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The loadLocal function takes a keyword, as this is used to find the relevant tweets in the localStorage cache.

loadLocal 函数接受一个 keyword 作为参数，该关键词也被用于在 localStorage 高速缓存中寻找相关 tweet。

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Once again, you do some browser capability detection, by first checking if the window object has the localStorage property, per the HTML 5 specification.

同样，这里做了一些浏览器功能检查，按照 HTML 5 规范，首先检查 window 对象是否有 localStorage 属性。

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