# Example
# Common Usage
# Usage Example
::: javascript
```js
var a = { n: 1 };
var b = a;
a.x = a = { n: 2 };
// 请写出以下输出结果
console.log(a.x);
console.log(b);
```
:::
# Result
# Set title
# Usage Example
::: javascript JavaScript Demo: Array.includes()
```js
const array1 = [1, 2, 3];
console.log(array1.includes(2));
// expected output: true
const pets = ["cat", "dog", "bat"];
console.log(pets.includes("cat"));
// expected output: true
console.log(pets.includes("at"));
// expected output: false
```
:::