<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
function Person(name, age, sex) {
this.name = name;
this.age = age;
this.sex = sex;
this.eat = function () {
console.log(this.name + "在吃饭");
}
}
Person.prototype.run = function () {
console.log(this.name + "在跑步");
};
Person.prototype.age = 19;
var per = new Person("Andy", 18, "男");
console.log(per.age);//18
per.run();
/*
* 实例对象使用属性和方法时，先在当前对象查询，查询到直接使用，如果查询不到则去原型对象中查找，如果还是查询不到则报错
* */
</script>
</body>
</html>
