front_basic/14.js_callback.html at main · luail/front_basic · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>js 콜백함수</title>
</head>
<body>
    <button onclick="basicFunthion()">일반함수 예제</button>
    <button onclick="callbackFunction1()">콜백함수 예제1</button>
    <button onclick="callbackFunction2()">콜백함수 예제2(동기적실행)</button>
    <button onclick="callbackFunction3()">콜백함수 예제3(비동기실행)</button>
    <script>
        function basicFunthion() {
            alert('hello world');
        }

        function callbackFunction1() {
            userInput((a)=>{console.log(a)});
        }

        function userInput(callback) {
            callback("hongildong");
        }

        function callbackFunction2() {
            const numbers = [1,2,3,4,5];
            numbers.forEach((a)=>console.log(a));
            console.log('hello world');
        }

        function callbackFunction3() {
            // setTimeout 함수는 js의 대표적인 비동기함수 중 하나(+콜백함수처리)
            setTimeout(()=>console.log('hello world1'), 2000);
            console.log('hello world2');
            console.log('hello world3');
        }
    </script>
</body>
</html>