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Update object.md

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这两段不知所云的英文插进代码段要干什么
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@ -1426,8 +1426,6 @@ let newVersion = {
```javascript
let aWithDefaults = { x: 1, y: 2, ...a };
// 等同于
even if property keys don’t clash, because objects record insertion order:
let aWithDefaults = Object.assign({}, { x: 1, y: 2 }, a);
// 等同于
let aWithDefaults = Object.assign({ x: 1, y: 2 }, a);
@ -1447,8 +1445,6 @@ const obj = {
```javascript
{...{}, a: 1}
// { a: 1 }
even if property keys don’t clash, because objects record insertion order:
```
如果扩展运算符的参数是`null`或`undefined`，这两个值会被忽略，不会报错。