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Update language.md #15

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Update language.md #15

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2 changes: 1 addition & 1 deletion source/docs/js/language.md
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Expand Up @@ -1221,7 +1221,7 @@ const { type, ...coords } = data
// 'coords' is now the 'data' object without its 'type' property.
```

### Hoisting
### 变量提升

- `var` 存在变量提升的情况，即 `var` 声明会被提升至该作用域的顶部，但是他们的赋值并不会。而 `const` 和 `let` 并不存在这种情况，他们被赋予了 [Temporal Dead Zones, TDZ](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let#Temporal_dead_zone_and_errors_with_let)， 了解 [typeof 不再安全](http://es-discourse.com/t/why-typeof-is-no-longer-safe/15)很重要

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