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์ฌ๋ผ์ด๋ ์ดํํธ 01. ํธ๋์ง์  ํจ๊ณผ
javascript๋ฅผ ์ด์ฉํ์ฌ ์ฌ๋ผ์ด๋ ์ดํํธ๋ฅผ ๋ง๋ค์์ต๋๋ค. ์ด์ฌํ ๊ณต๋ถํ์ธ์!
์ฌ๋ผ์ด๋ ์ดํํธ 01
์๋ฐ์คํฌ๋ฆฝํธ
const sliderWrap = document.querySelector(".slider__wrap");
const sliderImg = sliderWrap.querySelector(".slider__img");
const slider = sliderWrap.querySelectorAll(".slider");
let currentIndex = 0;   //ํ์ฌ ๋ณด์ด๋ ์ด๋ฏธ์ง ๋ณ์
let sliderCount = slider.length;    //์ด๋ฏธ์ง ๊ฐฏ์
setInterval(() => {
    let nextIndex = (currentIndex + 1) % sliderCount; //๋ค์ ์ด๋ฏธ์ง
    slider[currentIndex].style.opacity = "0";  //์ฒซ๋ฒ์งธ ์ด๋ฏธ์ง๋ฅผ ์๋ณด์ด๊ฒ
    slider[nextIndex].style.opacity = "1";  //๋๋ฒ์งธ ์ด๋ฏธ์ง๋ฅผ ๋ณด์ด๊ฒ
    currentIndex = nextIndex;
    //0 1 2 3 4 5 6 7 8 9...
    //0 1 2 3 4 0 1 2 3 4...
}, 2000);       
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