05_prototype.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        function student(a,b){
            this.sname=a;
            this.sage=b;

        }
        student.prototype.intr=function(){
                console.log(`Im${this.sname},Im${this.sage}`)
        }
        student.prototype.className="初一2班"           
        var lilei=new student('lilei',12)
        var hanmeimei=new student('meimei',13)
        console.log(lilei)
        console.log(hanmeimei)
        console.log(lilei.className,hanmeimei.className)
        student.prototype.className="初二2班"
        console.log(lilei.className,hanmeimei.className)
    </script>
</body>
</html>