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Update 2017-03-04-lesson21.md #13

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Jun 28, 2017
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2 changes: 1 addition & 1 deletion _posts/2017-03-04-lesson21.md
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Expand Up @@ -57,7 +57,7 @@ ReactDOM.render(
这样你获取到的是这个 `Clock` 组件在 React.js 内部初始化的实例。但这并不是什么常用的做法，而且也并不建议这么做，所以这里就简单提及，有兴趣的朋友可以自己学习探索。

## 课后练习
* <a target="_blank" href="http://scriptoj.huziketang.com/problems/11">获取文本的长度</a>
* <a target="_blank" href="http://scriptoj.huziketang.com/problems/11">获取文本的高度</a>

* * *

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