浅析2种JavaScript继承方式

function Body(name,age){// 创建一个Body类  this.name = name;// 赋予基础属性name、age  this.age = age;}Body.prototype.sayName =function() {// 给原型定义一个sayName的方法  console.log(this.name);}var a = new Body('wutao','10');//创建一个Body的实例对象function Another(){}Another.prototype = new Body('www');//将Body实例对象给新创建的子类(Another)的prototype属性，这样，Another就拥有了Body的属性和方法var b = new Another();//创建Another子类的实例Another.prototype.sex ="mail";//定义子类的属性及方法Another.prototype.saySex = function(){  console.log(this.sex);}a.sayName();//wutaob.sayName();//www 实例b拥有父类Body的方法sayNameb.saySex();//mail 实例b拥有自己定义的方法saySex

function Person(name){  this.name = name;  this.sayHello = function(){    console.log(this.name);  }}function Son(name,age){  Person.call(this,name,age);//call用法：将this指针指向父类构造函数，并依次传入参数，使其拥有父类的属性和方法  this.age = age;  this.sayFunc = function(){    console.log(this.name+"-"+this.age);  } }var a = new Person('wutao');var b = new Son("wwwwww",22);a.sayHello();//wutaob.sayHello();//wwwwww; 通过call继承来的父类Person的方法sayHellob.sayFunc();//wwwwww-22

function Person(name){  this.name = name;  this.sayHello = function(){    console.log(this.name);  }}function Son(name,age){  Person.apply(this,[name,age]);//apply用法：类似call，将this指针指向父类构造函数，并传入一个由参数组成的数组参数，使其拥有父类的属性和方法  this.age = age;  this.sayFunc = function(){    console.log(this.name+"-"+this.age);  } }var a = new Person('wutao');var b = new Son("ttt",222);a.sayHello();//wutaob.sayHello();//ttt;通过apply继承来的父类Person的方法sayHellob.sayFunc();//ttt-222