js的三种继承方式详解
编程学习 2021-07-04 19:20www.dzhlxh.cn编程入门
本文主要介绍了js的三种继承方式。具有一定的参考价值,狼蚁网站SEO优化跟着长沙网络推广一起来看下吧
1.js原型(prototype)实现继承
代码如下
<body> <script type="text/javascript"> function Parent(name,age){ this.name=name; this.age=age; this.sayHi=function(){ alert("Hi, my name is "+this.name+", my age is "+this.age); } } //Child继承Parent function Child(grade){ this.grade=grade; this.sayGrade=function(){ alert("My grade is "+this.grade); } } Child.prototype=new Parent("狼蚁网络推广","10");/////////// var chi=new Child("5"); chi.sayHi(); chi.sayGrade(); </script> </body>
2.构造函数实现继承
代码如下:
<body> <script type="text/javascript"> function Parent(name,age){ this.name=name; this.age=age; this.sayHi=function(){ alert("Hi, my name is "+this.name+", my age is "+this.age); } } //Child继承Parent function Child(name,age,grade){ this.grade=grade; this.sayHi=Parent;/////////// this.sayHi(name,age); this.sayGrade=function(){ alert("My grade is "+this.grade); } } var chi=new Child("狼蚁网络推广","10","5"); chi.sayHi(); chi.sayGrade(); </script> </body>
3.call , apply实现继承 -----很方便!
代码如下:
<body> <script type="text/javascript"> function Parent(name,age){ this.name=name; this.age=age; this.sayHi=function(){ alert("Hi, my name is "+this.name+", my age is "+this.age); } } function Child(name,age,grade){ this.grade=grade; // Parent.call(this,name,age);/////////// // Parent.apply(this,[name,age]);/////////// 都可 Parent.apply(this,arguments);/////////// this.sayGrade=function(){ alert("My grade is "+this.grade); } // this.sayHi=function(){ // alert("Hi, my name is "+this.name+", my age is "+this.age+",My grade is "+this.grade); // } } var chi=new Child("狼蚁网络推广","10","5"); chi.sayHi(); chi.sayGrade(); </script> </body>
以上就是本文的全部内容,希望本文的内容对大家的学习或者工作能带来一定的帮助,同时也希望多多支持狼蚁SEO!
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