js_practice/2_class_2.html at master · 200wonman/js_practice · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <script>

        /*
            [use strict]
            Object-oriented programming
            class : template
            object : instance of a class
            JavaScript classes
            - introduced in ES6
            - syntactical sugar over prototype-based inheritance
              (기존에 존재하던 문법에 좀 더 편한 기능을 추가한걸 syntactical sugar라고 한다. )
        */


        // class, object : 여러가지 타입의 값을 가지고 있으려고(그래서 함수도 넣을 수 있음)
        // func : 타입을 일관성있게 계산하고 가지려고


        // 1. Class declarations
        class Person {
            // constructor
            constructor(name, age) {
                //fields
                this.name = name;
                this.age = age;
            }

            //methods
            speak(){
                console.log(`${this.name} :hello!`);
            }
        }


        const juye = new Person('juye',30); // 매개변수를 전달
        console.log('age : '+ juye.age);
        console.log('name : '+ juye.name);
        console.log(juye)
        juye.speak();


        class Fruit {

            constructor(color, size){
                this.color = color;
                this.size = size;
            }

            info(){
               console.log(`${this.size}${this.color} fruit!`)
            };
        }

        const apple = new Fruit('red', 'small');
        console.log(apple);


    </script>

</body>
</html>