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Update JS-ch.md #123

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8 changes: 7 additions & 1 deletion JS/JS-ch.md
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Expand Up @@ -119,7 +119,13 @@ a === void 0

## 对象转基本类型

对象在转换基本类型时，首先会调用 `valueOf` 然后调用 `toString`。并且这两个方法你是可以重写的。
对象在转换基本类型时，会调用 `valueOf` 和 `toString` 方法。这两个方法是可以重写的，其中调用步骤如下：

第一步，调用对象自身的valueOf方法。如果返回原始类型的值，则直接使用该值，不再进行后续步骤。

第二步，如果valueOf方法返回的还是对象，则改为调用对象自身的toString方法。如果toString方法返回原始类型的值，则直接使用该值，不再进行后续步骤。

第三步，如果toString方法返回的是对象，就会报错。

```js
let a = {
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