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                            #### 1. 強制轉換：
1. Number(value)
string, boolean --> Number(value)
特點：只能識別純數字的字符串
true -->  1
false --> 0 
     ```
   var a = "12";  
   var b = "true";
   var c = true;
   var d = false;
   console.log(Number(a));  //12
   console.log(Number(b));  //NaN
   console.log(Number(c));  //1
   console.log(Number(d));  //0
    ```
2. string --> Number    parseInt(), parseFloat()
3. other --> Boolean    Boolean()
4. other --> String    String()  toString()

#### 2. 自動轉換：
發生在計算中：算術，比較，邏輯，三目，賦值
1. 只要一邊為boolean，先將其轉為number
2. 字符串和數字相加，轉化為字符串
3. NaN與任何值計算都是NaN

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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