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                            1. NaN(非數) 是一個`number` 類型，不等于任何值，包括自己
2. 數字擁有方法: Math
```
Math.ceil()上取整
Math.floor()下取整
Math.round()四舍五入取整
Math.random()取0-1的隨機數, 左閉右開
Math.max()取最大值
Math.min()取最小值
```
    
#### 為什么0.1 + 0.2 !== 0.3
1.因為 js采用的是雙精度版本的
2.因為0.1 + 0.2的加法是采用二進制的，不等于0.3的二進制

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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