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2 changes: 1 addition & 1 deletion 21.md
Original file line number Diff line number Diff line change
Expand Up @@ -655,7 +655,7 @@ runApp();

## 习题

下面的习题涉及修改本章中定义的系统。为了使用该系统进行工作,请确保首先下载[代码](http://eloquentjavascript.net/code/skillshare.zip),安装了 [Node](http://nodejs.org/),并使用`npm install`安装了项目的所有依赖。
下面的习题涉及修改本章中定义的系统。为了使用该系统进行工作,请确保首先下载[代码](http://eloquentjavascript.net/code/skillsharing.zip),安装了 [Node](http://nodejs.org/),并使用`npm install`安装了项目的所有依赖。

### 磁盘持久化

Expand Down