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### 今日原题
[第十四题：JS 类型](https://github.com/KieSun/fucking-frontend/issues/19)
[第十七题：以下代码输出什么？为什么？](https://github.com/KieSun/fucking-frontend/issues/22)
请问 JS 基本类型和对象类型中各有哪些类型？
对于这些类型我们如何判断具体的类型。比如数组是对象类型，可以通过 `Array.isArray` 等方法判断是数组。
```js
var a = 0
var b = async () => {
a = a + await 10
console.log('2', a) // -> ？
}
b()
a++
console.log('1', a) // -> ？
```
## 前端十五万字面试资料