Home Web Front-end JS Tutorial A brief discussion on static attributes and prototype attributes of Javascript_javascript skills

A brief discussion on static attributes and prototype attributes of Javascript_javascript skills

May 16, 2016 pm 04:00 PM
javascript static properties

This article will introduce you to an example of Javascript’s static methods and prototype methods. If you don’t understand Javascript’s static methods and prototype methods, you can take a look with the editor. A piece of code to understand static methods and instance methods:

    <script>
    //对象构造函数
    function Atest(name){
      //私有属性,只能在对象构造函数内部使用
      var className = "Atest";
      //公有属性,在对象实例化后调用
      this.name = name;
      //对象方法
      this.hello = function(){
        alert(this.name);
        alert(this.msg());//使用原型方法扩充的方法可以在类内部使用
        alert(this.sex);//使用原型方法扩充的属性可以在类内部使用
        alert(Atest.age);//静态属性调用时格式为[对象.静态属性]
      }
    }
    //类方法 (实际是静态方法直接调用) 位置:Person类的外部 语法格式:类名称.方法名称 = function([参数...]){ 语句行; }
    Atest.Run = function(){
      alert("我是类方法 Run");
    }
 
 
    //原型方法
    Atest.prototype.msg = function(){
      alert("我的名字是:"+this.name);//如果原型方法当作静态方法直接调用时,this.name无法被调用
    }
 
    //公有静态属性 在类的外部
    Atest.age = 20;//公有静态属性不能使用 【this.属性】,只能使用 【对象.属性】 调用
 
    //原型属性,当作是类内部的属性使用【this.原型属性】,也可以当成公有静态属性使用【对象.prototype.原型属性】
    Atest.prototype.sex = "男";
 
    Atest.Run(); //类方法也是静态方法,可以直接使用 【对象.静态方法()】
    Atest.prototype.msg();//原型方法当成静态方法使用时【对象.prototype.方法()】 
    alert(Atest.prototype.sex);//原型属性当作静态属性使用时【对象.prototype.方法()】
    var a = new Atest("zhangsan");//对象方法和原型方法需要实例化对象后才可以使用
    a.hello();//对象方法必须实例化对象
    a.msg();//原型方法必须实例化对象
    alert(a.age)://错误,公有静态属性只能使用 【对象.属性】调用
 
    //ps:尽量将方法定义为原型方法,原型方法避免了每次调用构造函数时对属性或方法的构造,节省空间,创建对象快.
  </script>
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