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Feb 26, 2017
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Update destructuring.md #339

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2 changes: 1 addition & 1 deletion docs/destructuring.md
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Expand Up @@ -420,7 +420,7 @@ s === Boolean.prototype.toString // true

上面代码中，数值和布尔值的包装对象都有`toString`属性，因此变量`s`都能取到值。

解构赋值的规则是，只要等号右边的值不是对象，就先将其转为对象。由于`undefined`和`null`无法转为对象，所以对它们进行解构赋值，都会报错。
解构赋值的规则是，只要等号右边的值不是对象或数组，就先将其转为对象。由于`undefined`和`null`无法转为对象，所以对它们进行解构赋值，都会报错。

```javascript
let { prop: x } = undefined; // TypeError
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