<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
</head>
<body>
<script type="text/javascript">
function Person() {
this.name = ‘老王‘;
this.age = 40;
}
Person.prototype.showName = function () {
// alert(this.name);
alert(this.age);
};
function Person1() {
Person.call(this);
}
/*
** 方法一 类式继承
**
*/
// var F = function () {};
// F.prototype = Person.prototype;
// Person1.prototype = new F();
// Person1.prototype.constructor = Person1;
/*
** 方法二 类式继承2
**
*/
// Person1.prototype = Person.prototype;
// Person1.prototype.constructor = Person1;
/*
** 方法三 拷贝继承
**
*/
// extend( Person1.prototype, Person.prototype );
// function extend( obj1, obj2 ) {
// for( var attr in obj2 ){
// obj1[attr] = obj2[attr];
// }
// }
/*
** 方法四 原型继承
**
*/
var a = {
age : 1000
};
var b = Inherit(a);
b.age = 24;
alert(b.age);
function Inherit(obj) {
var F = function () {};
F.prototype = obj;
return new F();
}
// var p1 = new Person1();
// p1.showName();
</script>
</body>
</html>
原文：http://www.cnblogs.com/zsongs/p/5592518.html