awtk/docs/fscript_bits.md

## 位操作扩展函数

### 1. &

> 位与运算。
----------------------------

#### 原型

```
n1 & n2
```

#### 示例

```
print(1 & 1)
```

### 2. |

> 位或运算。
----------------------------

#### 原型

```
n1 | n2
```

#### 示例

```
print(|(1, 2))
```

### 3.~

> 按位取反运算。
----------------------------

#### 原型

```
~(n1)
```

#### 示例

```
print(~1)
```

### 4.^

> 异或运算。
----------------------------

#### 原型

```
n1^n2
```

#### 示例

```
print(n1^n2)
```

### 5. <<

> 左移
----------------------------

#### 原型

```
n1<<n2
```

#### 示例

```
print(n1<<n2)
```

### 6. >>

> 右移
----------------------------

#### 原型

```
n1>>n2
```

#### 示例

```
print(n1>>n2)
```

### 7. bit_get

> 获取指定的位
----------------------------

#### 原型

```
bit_get(n1, n2) => bool
```

#### 示例

```
print(bit_get(0b1010, 1))
```

### 8. bit_set

> 设置指定的位
----------------------------

#### 原型

```
bit_set(n1, n2) => value
```

#### 示例

```
print(bit_set(0b1010, 0))
```

### 9. bit_clear

> 清除指定的位
----------------------------

#### 原型

```
bit_clear(n1, n2) => value
```

#### 示例

```
print(bit_clear(0b1010, 1))
```

### 10. bit_toggle

> 取反指定的位
----------------------------

#### 原型

```
bit_toggle(n1, n2) => value
```

#### 示例

```
print(bit_toggle(0b1010, 1))
```

### 更多示例

```js
assert(bit_clear(0b0111, 1) == 0b0101)
assert(bit_clear(0b0111, 0) == 0b0110)

assert(bit_set(0b0, 0) == 0b1)
assert(bit_set(0b0, 1) == 0b10)
assert(bit_set(0b0, 2) == 0b100)

assert(bit_toggle(0b000, 0) == 0b1)
assert(bit_toggle(0b111, 1) == 0b101)
assert(bit_toggle(0b101, 2) == 0b1)

assert(bit_get(0b0111, 0))
assert(bit_get(0b0111, 1))
assert(!bit_get(0b0011, 2))

assert((1<<1) == 2)
assert((1<<2) == 4)
assert((1<<8) == 256)
assert(((0xf0112233 >> 24) & 0xff)  == 0xf0)
```