zoukankan      html  css  js  c++  java
  • js 原型

       1:  function Person (name,age) {
       2:              this.name = name;
       3:              this.age = age;
       4:          }
       5:   
       6:          Person.prototype = {
       7:              constructor : Person, // 原型{}这种格式得重新定义指向 要不然默认是Object
       8:              getInfo: function() {
       9:                  return 'A ' + this.name + ' ' + this.age + '.';
      10:              }
      11:          };
      12:   
      13:          var p = new Person('Lily',18);
      14:   
      15:          /**
      16:           * Person的prototype属性指向Person的prototype对象
      17:           * Person的实例p的__proto__属性指向Preson的prototype对象
      18:           * Preson的prototype对象的constructor属性指向Person
      19:           */
      20:          console.log(p.constructor); // Person
      21:          console.log(p.__proto__ == Person.prototype); // true
      22:          console.log(p.__proto__.constructor == Person); // true  p.__proto__ 指向Person的prototype对象 Person的prototype对象constructor属性指向Person构造器
      23:   
      24:          //Object.create EcmaScript5 以上有
      25:          var Person2 = Object.create(p); //复制对象
      26:          console.log(Person2.name);// Lily
      27:          Person2.age = 20;
      28:          console.log(Person2.age);// 20
      29:          console.log(p.age);// 20
      30:   
      31:          var o1 = Object.create({x:1, y:2});
      32:          var o2 = Object.create(Object.prototype);
      33:          console.log(o2);
      34:          console.log(new Object());
       1:  function Person (name,age) {
       2:              this.name = name;
       3:              this.age = age;
       4:          }
       5:   
       6:          Person.prototype = {
       7:              constructor : Person, // 原型{}这种格式得重新定义指向 要不然默认是Object
       8:              getInfo: function() {
       9:                  return 'A ' + this.name + ' ' + this.age + '.';
      10:              }
      11:          };
      12:   
      13:          var p = new Person('Lily',18);
      14:   
      15:          /**
      16:           * Person的prototype属性指向Person的prototype对象
      17:           * Person的实例p的__proto__属性指向Preson的prototype对象
      18:           * Preson的prototype对象的constructor属性指向Person
      19:           */
      20:          console.log(p.constructor); // Person
      21:          console.log(p.__proto__ == Person.prototype); // true
      22:          console.log(p.__proto__.constructor == Person); // true  p.__proto__ 指向Person的prototype对象 Person的prototype对象constructor属性指向Person构造器
      23:   
      24:          //Object.create EcmaScript5 以上有
      25:          var Person2 = Object.create(p); //复制对象
      26:          console.log(Person2.name);// Lily
      27:          Person2.age = 20;
      28:          console.log(Person2.age);// 20
      29:          console.log(p.age);// 20
      30:   
      31:          var o1 = Object.create({x:1, y:2});
      32:          var o2 = Object.create(Object.prototype);
      33:          console.log(o2);
      34:          console.log(new Object());
  • 相关阅读:
    fetch jsonp请求接口
    mysql explain执行计划详解
    MySQL主从复制与读写分离 --非原创
    C#修改文件或文件夹的权限,为指定用户、用户组添加完全控制权限
    Mysql有没有语法可以在增加列前进行判断该列是否存在
    .net4.0注册到IIS ,重新注册IIS ,iis注册
    C#操作IIS程序池及站点的创建配置
    .net C# 对虚拟目录IIS的操作
    I​n​n​o​ ​s​e​t​u​p​ ​常​用​修​改​技​巧
    innosetup语法详解
  • 原文地址:https://www.cnblogs.com/yuan001/p/3673920.html
Copyright © 2011-2022 走看看