我們知道javaScript沒有“類”的概念，那javascript是不是就不能實現繼承了呢？答案是否定的，下面的例子就實現了兩個類的繼承。
Person 是父類，Student是子類，extend是實現兩個對象的繼承的函數，“subClass.superClass = superClass.prototype.constructor”是在子類添加一個靜態的屬性保存父類的constructor，方便對父類屬性的拷貝繼承， “Student.superClass.call(this,name,age); // 屬性繼承”便是實現了對父類屬性的拷貝繼承。實現兩個類的集成只需調用extend函數即可完成繼承。
<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); // 屬性繼承
};
// 繼承
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>
