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add let

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Hencky2018 2018-11-22 11:30:44 +08:00
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docs/set-map.md
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@ -219,7 +219,7 @@ for (let x of set) {
Set 结构的实例与数组一样，也拥有`forEach`方法，用于对每个成员执行某种操作，没有返回值。 Set 结构的实例与数组一样，也拥有`forEach`方法，用于对每个成员执行某种操作，没有返回值。
```javascript ```javascript
set = new Set([1, 4, 9]); let set = new Set([1, 4, 9]);
set.forEach((value, key) => console.log(key + ' : ' + value)) set.forEach((value, key) => console.log(key + ' : ' + value))
// 1 : 1 // 1 : 1
// 4 : 4 // 4 : 4