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参数对象`opts`如果不存在属性`foo`和属性`bar`   
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参数对象`opts`如果不存在属性`foo`和属性`baz`
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@ -298,7 +298,7 @@ function example(opts) {
}
```
上面示例中，参数对象`opts`如果不存在属性`foo`和属性`bar`，则为这两个属性设置默认值。有了“Null 赋值运算符”以后，就可以统一写成下面这样。
上面示例中，参数对象`opts`如果不存在属性`foo`和属性`baz`，则为这两个属性设置默认值。有了“Null 赋值运算符”以后，就可以统一写成下面这样。
```javascript
function example(opts) {