<script>

var extend = function (subClass, superClass) {

//1.继承类的中间类

var Tmp = function() {};

//2.将父类的原型传递给中间类

Tmp.prototype = superClass.prototype;

//3.设值继承关系

subClass.prototype = new Tmp();

subClass.prototype.constructor = subClass;

//4.在子类中将父类的this转换成当前类的this

subClass.convertASThis = superClass.prototype;

}

function Person(name) {

this.name = name;

}

function Author(name, books) {

//使用call方法将父类的this转换为本类的this，并将name属性合并到当前类

Author.convertASThis.constructor.call(this, name);

this.books = books;

this.getInfo = function() {

return this.name + " -> " + this.books;

}

}

onload = function() {

extend(Author, Person);

var a = new Author("aa", "bb");

alert(a.getInfo());

}

</script>