JS中封装性，你真的懂封装性嘛？？？？console.console.console./*console.console

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
  
</head>
<body>
    <script>
        /*function demo()
        {
            var num="局部变量1";
            let value="局部变量2";
            function test()
            {
                console.log("局部函数");
            }
            console.log(num);
            console.log(value);//记住,局部的变量与函数只能在他所在的作用域中输出,不然会错
            test();
        }
        demo();
        */
        /*console.log(num);
        console.log(value);
        test();*/
        function Person()
        {
            this.name="cyg";
            let age=20;
            this.setAge=function(myAge)
            {
                 if(myAge >= 0){
                    age = myAge;
                }
            }
            this.getAge = function () {
                return age;
            }
            this.say = function () {
                console.log("hello world");
            }

        }
         let obj = new Person();
         obj.setAge(666);
         console.log(obj.getAge());
    </script>
</body>
</html>