this
객체 프로퍼티에 할당된 함수 -> 메서드
그냥 함수는 윈도우를 바라 봄
let user = {
name: 'green',
age: 30,
say: function(){
console.log('aaa');
}
}
let user = {
name: 'green',
age: 30,
say(){
console.log(this.name);
}
}
08methodthis.html
<!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>
<ul>
<li onclick="liView(this)">menu1</li>
<li onclick="liView(this)">menu2</li>
<li onclick="liView(this)">menu3</li>
<li onclick="liView(this)">menu4</li>
</ul>
<div><img src="../images/img_lights1.jpg" alt="안녕" onclick="imgSrc(this)"></div>
<script>
function imgSrc(img) {
console.log(img.src);
}
function liView(a) {
console.log(a);
}
let user = {
name: 'green',
age: 20,
say:function() {
console.log(this.name);
}
}
let user2 = {
name: 'blue',
age: 30,
say() {
console.log(this.name);
}
}
let obj = {
print:function() {
console.log(this);
}
}
function printThis() {
console.log(this);
}
printThis();
user.say();
user2.say();
console.log(this);
obj.print();
</script>
</body>
</html>
08ex_t.html
<!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>
<style>
* { margin: 0; padding: 0; box-sizing: border-box;}
#wrap {
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
ul {
display: flex ;
}
ul li {
width: 25%;
list-style: none;
}
ul li img {
width: 100%;
}
#imgView {
position: absolute;
width: 100%;
height: 100vh;
background: rgba(0, 0, 0, 0.5);
top: 0;
left: 0;
display: none;
flex-direction: column;
justify-content: center;
align-items: center;
}
#imgView span {
position: absolute;
right: 50px;
top: 50px;
color: #fff;
font-size: 48px;
}
</style>
</head>
<body>
<div id="wrap">
<ul>
<li><img src="../images/img_lights1.jpg" alt="첫번째 이미지입니다." onclick="viewImg(this)"></li>
<li><img src="../images/img_lights2.jpg" alt="두번째 이미지입니다." onclick="viewImg(this)"></li>
<li><img src="../images/img_lights3.jpg" alt="세번째 이미지입니다." onclick="viewImg(this)"></li>
<li><img src="../images/img_lights4.jpg" alt="네번째 이미지입니다." onclick="viewImg(this)"></li>
</ul>
</div>
<div id="imgView">
<span onclick="hideDiv()">X</span>
<img src="../images/img_lights1.jpg" alt="" id="bigImg">
<p>첫번째 이미지입니다.</p>
</div>
<script>
function viewImg(img) {
let imgSrc = img.src;
document.querySelector('#imgView').style.display = 'flex';
document.querySelector('#bigImg').src=imgSrc;
document.querySelector('p').innerHTML = img.alt;
}
function hideDiv() {
document.querySelector('#imgView').style.display = 'none';
}
</script>
</body>
</html>
08ex.html (내가 한 것 . .)
<!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>
<style>
* { margin: 0; padding: 0; box-sizing: border-box;}
img { vertical-align: top; }
li { list-style: none; }
.inner {
width: 100%;
max-width: 1200px;
margin: 0 auto;
height: 100vh;
display: flex;
align-items: center;
position: relative;
z-index: 1;
}
ul {
display: flex;
}
img {
width: 100%;
}
#blackbg {
width: 100%;
height: 100vh;
background-color: rgba(0, 0, 0, 0.5);
position: absolute;
left: 0;
top: 0;
opacity: 0;
display: flex;
}
#bigimg {
z-index: 1;
position: absolute;
width: 50%;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
display: flex;
}
#btn {
font-size: 62px;
color: #fff;
position: absolute;
left: 80%;
top: 5%;
z-index: 2;
}
</style>
</head>
<body>
<div id="wrap">
<ul class="inner">
<li><img src="../images/img_lights1.jpg" alt="첫번째 이미지입니다." onclick="imgSrc(this)"></li>
<li><img src="../images/img_lights2.jpg" alt="두번째 이미지입니다." onclick="imgSrc(this)"></li>
<li><img src="../images/img_lights3.jpg" alt="세번째 이미지입니다." onclick="imgSrc(this)"></li>
<li><img src="../images/img_lights4.jpg" alt="네번째 이미지입니다." onclick="imgSrc(this)"></li>
</ul>
<div id="blackbg">
<img src="" alt="" id="bigimg">
<div id="btn" onclick="closepic()">x</div>
</div>
</div>
<script>
function imgSrc(img) {
alert(img.alt);
document.querySelector('#blackbg').style.opacity = 1;
document.querySelectorAll('img')[0].style.opacity = 0.5;
document.querySelectorAll('img')[1].style.opacity = 0.5;
document.querySelectorAll('img')[2].style.opacity = 0.5;
document.querySelectorAll('img')[3].style.opacity = 0.5;
document.querySelector('#bigimg').src = img.src;
}
function closepic() {
document.querySelector('#blackbg').style.opacity = 0;
document.querySelectorAll('img')[0].style.opacity = 1;
document.querySelectorAll('img')[1].style.opacity = 1;
document.querySelectorAll('img')[2].style.opacity = 1;
document.querySelectorAll('img')[3].style.opacity = 1;
}
</script>
</body>
</html>
동기 비동기
console.log(2)
console.log(3)
console.log(4)
console.log(5)
console.log(6)
console.log(7)
for(let i = 0; i< 100; i ++) {
console.log(i);
}
console.log(8)
setInterval(함수, 시간) // 시간 지나갈 때마다 함수를 실행
setInterval(function(){
console.log('안녕');
}, 1000) // 1000이 1초 ms 단위
setTimeout(함수, 시간) // 얘는 시간에 한번 때려주고 끝 ! 일회성
clearInterval(timer);
setInterval.html
<!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>
setInterval(function(){
console.log('안녕');
},2000)
setTimeout(function(){
console.log('안녕');
},5000)
console.log(2);
</script>
</body>
</html>
fadein.html
<!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>
<style>
* {margin: 0; padding: 0; box-sizing: border-box; }
body {
width: 100%;
height: 100vh;
}
@keyframes fadein{
0% { opacity: 0.4; }
100% { opacity: 1; }
}
.fadeImg {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
animation: fadein 0.5s;
}
</style>
</head>
<body>
<div class="fadeImg"><img src="../images/img_lights1.jpg" alt=""></div>
<div class="fadeImg"><img src="../images/img_lights2.jpg" alt=""></div>
<div class="fadeImg"><img src="../images/img_lights3.jpg" alt=""></div>
<div class="fadeImg"><img src="../images/img_lights4.jpg" alt=""></div>
<script>
let imgDivs = document.querySelectorAll('.fadeImg');
let indexNum = 0;
let nextNum;
// imgDivs 안에 있는 값 div의 스타일 display를 none으로 변경
imgDivs.forEach(div => div.style.display = 'none');
// for(let i=0; i<imgDivs.length; i++) {
// imgDivs[i].style.display = 'none';
// }
imgDivs[0].style.display = 'block';
/*
1) 0초일 때
indexNum = 0
2) 3초일 때
1번 줄 indexNum => 0 nextNum => 1
4번 줄 indexNum => 1
3) 6초일 때
1번 줄 indexNum => 1 nextNum => 2
4번 줄 indexNum => 2
4) 9초일 때
1번 줄 indexNum => 2 nextNum => 3
4번 줄 indexNum => 3
5) 12초일 때
1번 줄 indexNum => 3 nextNum => 4
4번 줄 indexNum =>
*/
setInterval(function(){
nextNum = indexNum === 3? 0: indexNum+1; // nextNum = (indexNum + 1) % 4;
imgDivs[indexNum].style.display = 'none';
imgDivs[nextNum].style.display = 'block';
indexNum = nextNum;
},3000)
</script>
</body>
</html>
slideLeft.html
<!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>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
li { list-style: none;}
#divView {
width: 600px;
height: 400px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
overflow: hidden;
}
#divs {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
transition: 0.5s;
}
.imgdiv {
position: absolute;
top: 0;
}
/* .imgdiv:nth-child(1) {
left: 0;
}
.imgdiv:nth-child(2) {
left: 100%;
}
.imgdiv:nth-child(3) {
left: 200%;
}
.imgdiv:nth-child(4) {
left: 300%;
} */
</style>
</head>
<body>
<div id="divView">
<div id="divs">
<div class="imgdiv"><img src="../images/img_lights1.jpg" alt=""></div>
<div class="imgdiv"><img src="../images/img_lights2.jpg" alt=""></div>
<div class="imgdiv"><img src="../images/img_lights3.jpg" alt=""></div>
<div class="imgdiv"><img src="../images/img_lights4.jpg" alt=""></div>
</div>
</div>
<script>
const imgDivs = document.querySelectorAll('.imgdiv');
let divLeft = 0;
imgDivs.forEach((imgdiv,index) =>{
imgdiv.style.left = 100 * index + '%' // imgdiv.style.left = `${index*100}%`;
})
// setInterval(함수, 시간)
setInterval(function(){
// 3초마다 이미지전환
// dom요소divs의 left값이 0%, -100%, -200%, -300%, 0, -100% . . .
divLeft = divLeft=== -3? 0 : divLeft - 1;
document.querySelector('#divs').style.left = `${divLeft * 100}%`
},3000)
</script>
</body>
</html>
</body>
</html>
slideLeft_real.html (인디게이터 추가버전)
<!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>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
li { list-style: none;}
#divView {
width: 600px;
height: 400px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
overflow: hidden;
}
#divs {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
transition: 0.5s;
}
.imgdiv {
position: absolute;
top: 0;
}
/* .imgdiv:nth-child(1) {
left: 0;
}
.imgdiv:nth-child(2) {
left: 100%;
}
.imgdiv:nth-child(3) {
left: 200%;
}
.imgdiv:nth-child(4) {
left: 300%;
} */
.btn {
width: 60px;
height: 60px;
background-color: tomato;
color: #fff;
border-radius: 50%;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
text-align: center;
line-height: 60px;
}
#prev {
margin-left: -250px;
}
#next {
margin-left: 250px;
}
#indi {
position: absolute;
bottom: 0;
/* background-color: lightblue; */
width: 100%;
text-align: center;
padding: 10px;
}
#indi span {
display: inline-block;
width: 16px;
height: 16px;
background-color: tomato;
border-radius: 50%;
margin: 0 6px;
font-size: 0;
}
#indi span.on {
background-color: #000;
}
</style>
</head>
<body>
<div id="divView">
<div id="divs">
<div class="imgdiv"><img src="../images/img_lights1.jpg" alt=""></div>
<div class="imgdiv"><img src="../images/img_lights2.jpg" alt=""></div>
<div class="imgdiv"><img src="../images/img_lights3.jpg" alt=""></div>
<div class="imgdiv"><img src="../images/img_lights4.jpg" alt=""></div>
<!-- <div class="imgdiv"><img src="../images/img_lights1.jpg" alt=""></div>
<div class="imgdiv"><img src="../images/img_lights2.jpg" alt=""></div> -->
</div>
<div id="prev" class="btn">이전</div>
<div id="next" class="btn">다음</div>
<div id="indi"></div>
</div>
<script>
const imgDivs = document.querySelectorAll('.imgdiv');
const next = document.querySelector('#next');
const prev = document.querySelector('#prev');
const indiDiv = document.querySelector('#indi');
let divLeft = 0;
let current = 0;
let indiStr = "";
// setInterval을 담을 변수
let timer;
imgDivs.forEach((imgdiv,index) =>{
imgdiv.style.left = `${index*100}%`; // imgdiv.style.left = `${index*100}%`;
indiStr = indiStr + `<span>${index}</span>`
})
indiDiv.innerHTML = indiStr;
let indi = document.querySelectorAll('#indi span');
indi[0].classList.add('on');
console.log(indi);
// 인디게이터 이벤트 연결
indiDiv.addEventListener('click', function(e){
let targetNum = e.target.innerHTML;
moveDiv(targetNum);
})
// document.querySelector('#indi').innerHTML = indiStr;
// 이전, 다음 버튼 이벤트 연결
prev.addEventListener('mouseenter', function(){
stopIt();
})
prev.addEventListener('mouseleave', function(){
startIt();
})
prev.addEventListener('click',function(){
// 이전으로 이동
// 현재의 이전값을 구함
let prevNum = current == 0? imgDivs.length-1 : current-1; // imgDivs.length-1 = 3
moveDiv(prevNum);
})
next.addEventListener('mouseenter',function(){
stopIt();
})
next.addEventListener('mouseleave',function(){
startIt();
})
next.addEventListener('click', function(){
//현재의 다음값을 구함
let nextNum = current == imgDivs.length-1? 0 : current + 1;
//다음값으로 이동
moveDiv(nextNum);
})
// div를 이동시키는 함수
function moveDiv(left){
document.querySelector('#divs').style.left = `${-(left * 100)}%`;
current = left;
console.log(current);
indi.forEach(ind=>{ind.classList.remove('on');})
indi[current].classList.add('on');
}
// 현재 보고있는 div가 0일 때 이전 3 다음 1
// 현재 보고있는 div가 1일 때 이전 0 다음 2
// 현재 보고있는 div가 2일 때 이전 1 다음 3
// 현재 보고있는 div가 3일 때 이전 2 다음 0
// 자동이미지 전환 실행함수(setInterval)
function startIt() {
// setInterval(함수, 시간)
timer = setInterval(function(){
// 3초마다 이미지전환
// dom요소divs의 left값이 0%, -100%, -200%, -300%, 0, -100% . . .
divLeft = current === imgDivs.length-1 ? 0 : divLeft + 1;
moveDiv(divLeft);
},3000)
}
// 자동이미지 전환 멈춤함수(clearInterval)
function stopIt() {
clearInterval(timer);
}
startIt();
</script>
</body>
</html>
</body>
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