代码语言：javascript复制
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
function Person(myName, myAge) {
// let per = new Object();
// let this = per;
// this = stu;
this.name = myName; // stu.name = myName;
this.age = myAge; // stu.age = myAge;
// this.say = function () { // stu.say = function () {}
// console.log(this.name, this.age);
// }
// return this;
}
Person.prototype.say=function()
{
console.log(this.name, this.age);
}
function Student(myName, myAge, myScore) {
Person.call(this, myName, myAge);
this.score = myScore;
this.study = function () {
console.log("day day up");
}
}
// 注意点: 要想使用Person原型对象中的属性和方法, 那么就必须将Student的原型对象改为Person的原型对象才可以
Student.prototype= Person.prototype;//修改student的原型对象为person的原型对象
//为了不破坏关系,得把student的构造函数指向person原型对象的constructor
Student.prototype.constructor=Student;
let stu = new Student("ww", 19, 99);
console.log(stu.score);
stu.say();
stu.study();
</script>
</body>
</html>
