一：轉換時間案例
1 需求：
用戶輸入秒數，系統會自動將秒數轉變為小時、分鐘、秒，并且不滿10的要在前面補零
2 算法：
小時:hour = parseInt(總秒數/60/60%24)
分鐘:minute = parseInt(總秒數/60%60)
秒數:second = parseInt(總秒數%60)
3 JS代碼實現：
let totalSecond = +prompt('請輸入總秒數')function getTime(total = 0) {//函數內沒有聲明直接使用的變量會變成全局變量let h = parseInt(total / 60 / 60 % 24)let m = parseInt(total / 60 % 60)let s = parseInt(total % 60)h = h < 10 ? '0' + h : hm = m < 10 ? '0' + m : ms = s < 10 ? '0' + s : sreturn (`當前還剩時間${h}小時${m}分${s}秒`)}let surplus = getTime(totalSecond)// document.write(surplus)
console.log(surplus);二：定時輪播圖
1 需求：每隔1秒鐘切換一張圖片
2 最終實現樣式：
3 代碼：
<!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>輪播圖點擊切換</title><style>* {box-sizing: border-box;}.slider {width: 560px;height: 400px;overflow: hidden;}.slider-wrapper {width: 100%;height: 320px;}.slider-wrapper img {width: 100%;height: 100%;display: block;}.slider-footer {height: 80px;background-color: rgb(100, 67, 68);padding: 12px 12px 0 12px;position: relative;}.slider-footer .toggle {position: absolute;right: 0;top: 12px;display: flex;}.slider-footer .toggle button {margin-right: 12px;width: 28px;height: 28px;appearance: none;border: none;background: rgba(255, 255, 255, 0.1);color: #fff;border-radius: 4px;cursor: pointer;}.slider-footer .toggle button:hover {background: rgba(255, 255, 255, 0.2);}.slider-footer p {margin: 0;color: #fff;font-size: 18px;margin-bottom: 10px;}.slider-indicator {margin: 0;padding: 0;list-style: none;display: flex;align-items: center;}.slider-indicator li {width: 8px;height: 8px;margin: 4px;border-radius: 50%;background: #fff;opacity: 0.4;cursor: pointer;}.slider-indicator li.active {width: 12px;height: 12px;opacity: 1;}</style>
</head><body><div class="slider"><div class="slider-wrapper"><img src="./images/slider01.jpg" alt="" /></div><div class="slider-footer"><p>對人類來說會不會太超前了？</p><ul class="slider-indicator"><li class="active"></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li></ul><div class="toggle"><button class="prev"><</button><button class="next">></button></div></div></div><script>const sliderData = [{ url: './images/slider01.jpg', title: '對人類來說會不會太超前了？', color: 'rgb(100, 67, 68)' },{ url: './images/slider02.jpg', title: '開啟劍與雪的黑暗傳說！', color: 'rgb(43, 35, 26)' },{ url: './images/slider03.jpg', title: '真正的jo廚出現了！', color: 'rgb(36, 31, 33)' },{ url: './images/slider04.jpg', title: '李玉剛：讓世界通過B站看到東方大國文化', color: 'rgb(139, 98, 66)' },{ url: './images/slider05.jpg', title: '快來分享你的寒假日常吧~', color: 'rgb(67, 90, 92)' },{ url: './images/slider06.jpg', title: '嗶哩嗶哩小年YEAH', color: 'rgb(166, 131, 143)' },{ url: './images/slider07.jpg', title: '一站式解決你的電腦配置問題！！！', color: 'rgb(53, 29, 25)' },{ url: './images/slider08.jpg', title: '誰不想和小貓咪貼貼呢！', color: 'rgb(99, 72, 114)' },]let i = 0const img = document.querySelector('.slider-wrapper img')const p = document.querySelector('.slider-footer p')let timer = setInterval(function () {i++// 無縫銜接位置if (i === sliderData.length) {i = 0// document.querySelector('.slider-indicator li:nth-child(1)').classList.add('active')}// 每秒更換圖片、小圓點、顏色img.src = sliderData[i].urlp.innerHTML = sliderData[i].title//給隨著圖片運動時，li標簽顏色發生變化，且讓當前li添加activedocument.querySelector('.slider-indicator .active').classList.remove('active')document.querySelector(`.slider-indicator li:nth-child(${i + 1})`).classList.add('active')}, 1000)</script>
</body></html>
 : 冪運算)
![[AIGC] Vue2與Vue3的主要區別和示例代碼](http://pic.xiahunao.cn/[AIGC] Vue2與Vue3的主要區別和示例代碼)
結果不正確問題)