JavaScript創建對象的四種方式

一. 使用Object創建一個新的對象

1>定義一個新的對象

var student1 = new Object()
var student1 = new Object()

2>添加屬性

student1.name = ‘張三’;
student1.age = 12;

3>取屬性值

var nameValue = student1.name;
var nameValue = student1[‘name’]//裏面可是要引起來哦;
var test = ‘name’;
var student1[‘test’];

4>刪除屬性

delete student1.name;

5>給對象添加行爲

student1.number = function(){
    return age ; 
}
// 調用則是 student1.number();

二.  通過字面量的方式創建對象

// 注:逗號分隔
var student2 = {
   age:20,
   name:’李四’,
   number:function(){
       return age;
    }
}
 student2.number;

三,通過工廠模式

 

function creatStudent(){
    var p = new Object();
     p.name = ‘王五’;
    p.age = 20;
    p.number = function(){return age}
return p;//一定要有返回值;
}
   var student3 = creatStudent();

四.  構建函數創建對象

function Student(name,age,numbe){ //函數首字母大寫
     this.name= name;
     this.age = age;
    this.number  = function(){
                 return age;
         }
}

一個函數是不是調用函數要看調用方式,以new開始調用的就是構造函數;

var student4 = new Student(‘haha’,20);