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quiz.html
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quiz.html
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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>Document</title>
</head>
<body>
<h1>콜백지옥 예시</h1>
<script>
// // 1. 1초 뒤에 body 태그의 색상을 빨간색 변경
// setTimeout(function () {
// const b = document.querySelector('body');
// b.style.backgroundColor = 'red';
// }, 1000);
// // 2. 1초 뒤에 body 태그의 색상을 빨 -> 1초 뒤 주 -> ... -> 1초 뒤 파란색
// setTimeout(function () {
// const b = document.querySelector('body');
// b.style.backgroundColor = 'red';
// setTimeout(function () {
// const b = document.querySelector('body');
// b.style.backgroundColor = 'orange';
// setTimeout(function () {
// const b = document.querySelector('body');
// b.style.backgroundColor = 'yellow';
// setTimeout(function () {
// const b = document.querySelector('body');
// b.style.backgroundColor = 'green';
// setTimeout(function () {
// const b = document.querySelector('body');
// b.style.backgroundColor = 'blue';
// }, 1000);
// }, 1000);
// }, 1000);
// }, 1000);
// }, 1000);
function changeRed() {
return new Promise(function (res, rej) {
setTimeout(function () {
document.body.style.backgroundColor = 'red';
res();
}, 1000);
});
}
function changeOrange() {
return new Promise(function (res, rej) {
setTimeout(function () {
document.body.style.backgroundColor = 'orange';
res();
}, 1000);
});
}
function changeYellow() {
return new Promise(function (res, rej) {
setTimeout(function () {
document.body.style.backgroundColor = 'yellow';
res();
}, 1000);
});
}
function changeGreen() {
return new Promise(function (res, rej) {
setTimeout(function () {
document.body.style.backgroundColor = 'green';
res();
}, 1000);
});
}
function changeBlue() {
return new Promise(function (res, rej) {
setTimeout(function () {
document.body.style.backgroundColor = 'blue';
res();
}, 1000);
});
}
changeRed()
.then(function (result) {
return changeOrange();
})
.then(function (result) {
return changeYellow();
})
.then(function (result) {
return changeGreen();
})
.then(function (result) {
return changeBlue();
});
</script>
</body>
</html>