我们知道javaScript没有“类”的概念，那javascript是不是就不能实现继承了呢？答案是否定的，下面的例子就实现了两个类的继承。
Person 是父类，Student是子类，extend是实现两个对象的继承的函数，“subClass.superClass = superClass.prototype.constructor”是在子类添加一个静态的属性保存父类的constructor，方便对父类属性的拷贝继承， “Student.superClass.call(this,name,age); // 属性继承”便是实现了对父类属性的拷贝继承。实现两个类的集成只需调用extend函数即可完成继承。
<head>
<title>index.html</title>
<style>
</style>
<script type="text/javascript" >
// Super class
var Person = function(name,age) {
this.name = name;
this.age = age;
this.books = [];
};
Person.prototype.getBooks = function() {
return this.books;
};
// sub Class
var Student = function(no,name,age) {
this.no = no;
Student.superClass.call(this,name,age); // 属性继承
};
// 继承
function extend(subClass,superClass) {
var F = function() {};
F.prototype = superClass.prototype;
subClass.prototype = new F();
subClass.superClass = superClass.prototype.constructor;
};
//Student.prototype = new Person();
extend(Student,Person);
Student.prototype.show = function() {
alert(this.name + "," + this.age);
};
var stu1 = new Student("wangmei",26);
stu1.books.push("java");
alert(stu1.getBooks());
var stu2 = new Student("jiashu",28);
stu2.books.push("javascript");
alert(stu2.getBooks());
</script>
</head>
<body >
<input type="button" value="getData" id="getData" οnclick="getData()"/>
<div id="data">
</div>
</body>
</html>
