JS基礎語法---（數據）簡單類型和複雜類型

1.     原始數據類型: number, string, boolean, undefined, null, object

2.     基本類型(簡單類型), 即值類型: number, string, boolean

3.     複雜類型(引用類型): object

4.     空類型:undefined, null

存儲空間

 值類型和引用類型的傳遞

 判斷下麵的值：

練習1：

       var num1 = 10;
       var num2 = num1;
       num1 = 20;
       console.log(num1);//20
       console.log(num2);//10

練習2：

       var num = 50;
       function f1(num) {
         num = 60;
         console.log(num);//60
       }
       f1(num); //50
       console.log(num);//50

 練習3：

       var num1 = 55;
       var num2 = 66;
       function f1(num, num1) {
         num = 100;
         num1 = 100;
         num2 = 100;
         console.log(num);//100
         console.log(num1);//100
         console.log(num2);//100
       }
    
       f1(num1, num2);
    
    
    
       console.log(num1);//55
       console.log(num2);//100
       console.log(num);// 報錯

練習4：

    function Person(name, age, salary) {
      this.name = name;
      this.age = age;
      this.salary = salary;
    }
    function f1(person) {
      person.name = "ls";
      person = new Person("aa", 18, 10);
    }

    var p = new Person("zs", 18, 1000);
    console.log(p.name); //zs
    f1(p);
    console.log(p.name); //ls

畫圖理解：