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Update destructuring.md

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修正395行错别字：‘结构’-》‘解构’
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@ -392,7 +392,7 @@ first // 1
last // 3
```
上面代码对数组进行对象结构。数组`arr`的`0`键对应的值是`1`，`[arr.length - 1]`就是`2`键，对应的值是`3`。方括号这种写法，属于“属性名表达式”，参见《对象的扩展》一章。
上面代码对数组进行对象解构。数组`arr`的`0`键对应的值是`1`，`[arr.length - 1]`就是`2`键，对应的值是`3`。方括号这种写法，属于“属性名表达式”，参见《对象的扩展》一章。
## 字符串的解构赋值