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es5面向对象：（没有统一的写法）
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
<script>
//以函数的形式来写对象---即是构造函数，又是类
function Person(name, age) {
this.name = name;
this.age = age;
}
//添加方法--方法独立在类之外
Person.prototype.showName = function () {
alert(this.name);
};
Person.prototype.showAge = function () {
alert(this.age);
};
//--------------------------------------------
//没有专门的继承方法
function Worker(name, age, job) {
Person.call(this, name, age); //从父类继承要靠骗
this.job = job;
}
Worker.prototype = new Person(); //没有专门继承父类方法的方式
Worker.prototype.constructor = Worker;
Worker.prototype.showJob = function () {
alert(this.job);
};
let w = new Worker('buding', 21, '编程');
w.showName();
w.showAge();
w.showJob();
</script>
</head>
<body>
</body>
</html>es6面向对象：（统一写法）
提供了4个关键字
class 类声明
constructor 构造函数
extends 继承
super 父类/超类
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
<script>
//有单独的类声明、构造函数声明
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
showName() {
alert(this.name);
}
showAge() {
alert(this.age);
}
}
class Worker extends Person { //继承
constructor(name, age, job) {
super(name, age);
this.job = job;
}
showJob() {
alert(this.job);
}
}
let w = new Worker('buding', 21, '编程');
w.showName();
w.showAge();
w.showJob();
</script>
</head>
<body>
</body>
</html>