forin和forof的区别
时间: 2024-05-18 11:17:58 浏览: 21
在JavaScript中,for-in和for-of是两个常用的循环语句。它们在迭代对象方面有一些不同之处。
首先,它们都可以用来循环数组。但是,for-in循环输出的是数组的索引下标,而for-of循环输出的是数组的每个元素的值。例如,对于数组[1,2,3,4]:
```javascript
// for-in循环
for (const key in arr){
console.log(key); // 输出 0,1,2,3
}
// for-of循环
for (const key of arr){
console.log(key); // 输出 1,2,3,4
}
```
可以看到,for-in循环输出了数组的索引下标,而for-of循环输出了数组的每个元素的值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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- *3* [for in 和 for of的区别](https://blog.csdn.net/qq_43796489/article/details/119566594)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
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