# 章序号/节序号/节/笔记序号
codecademy, Variable
# 概念阐释
- 可以用来重新分配一个不同的值。 reassigned a different value.
# 举例子
```js
let meal = 'Enchiladas';
meal='lalala'
console.log(meal); // Output: lalala 变量真的可以变
meal = 'Burrito';
console.log(meal); // Output: Burrito
```
# 类比、比较与对比
# 问题
**1.**
Create a `let` variable called `changeMe` and set it equal to the boolean `true`.
**2.**
On the line after `changeMe` is declared, set the value of `changeMe` to be the boolean `false`.
To check if `changeMe` was reassigned, log the value saved to `changeMe` to the console.
**3.**
什么是undefined？写一个undefined的例子。
# 问题答案
```js
let changeMe = true;
changeMe = false;
console.log(changeMe);
```
```js
let price;
console.log(price); // Output: undefined
```
# 备注（经验集/错误集）