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此处逗号会引起歧义，好似let会引起"变量提升"
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RocXing 2015-12-30 15:30:39 +08:00
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@ -59,7 +59,7 @@ a[6](); // 6
### 不存在变量提升 ### 不存在变量提升
`let`不像`var`那样，会发生“变量提升”现象。所以，变量一定要在声明后使用，否则报错。 `let`不像`var`那样会发生“变量提升”现象。所以，变量一定要在声明后使用，否则报错。
```javascript ```javascript
console.log(foo); // ReferenceError console.log(foo); // ReferenceError