---恢复内容开始---
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8" />
<title>Document</title>
</head>
<body>
<script>
People.prototype ={
x:100,y:200,z:function(){alert(300);}
} ; //上一级
function People(name,age){
this.name= name;
this.age = age;
} //类
var people = new People("张三",28); //构造函数
people.z();
//alert(people.);
构造函数
原文：https://www.cnblogs.com/aladam/p/10780112.html