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普斯泰網(wǎng)站建設(shè)百度搜索指數(shù)和資訊指數(shù)

news 2025/7/4 4:00:35
普斯泰網(wǎng)站建設(shè),百度搜索指數(shù)和資訊指數(shù),天津做藝術(shù)品的網(wǎng)站,阜新網(wǎng)站制作一、window定時(shí)器 1.window定時(shí)器方法 有時(shí)我們并不想立即執(zhí)行一個(gè)函數(shù)，而是等待特定一段時(shí)間之后再執(zhí)行，我們稱之為“計(jì)劃調(diào)用（scheduling a call）”。 目前有兩種方式可以實(shí)現(xiàn)： setTimeout 允許我們將函數(shù)推遲到一…

一、window定時(shí)器

1.window定時(shí)器方法

有時(shí)我們并不想立即執(zhí)行一個(gè)函數(shù)，而是等待特定一段時(shí)間之后再執(zhí)行，我們稱之為“計(jì)劃調(diào)用（scheduling a call）”。

目前有兩種方式可以實(shí)現(xiàn)：

  • setTimeout 允許我們將函數(shù)推遲到一段時(shí)間間隔之后再執(zhí)行。

  • setInterval 允許我們重復(fù)運(yùn)行一個(gè)函數(shù)，從一段時(shí)間間隔之后開始運(yùn)行，之后以該時(shí)間間隔連續(xù)重復(fù)運(yùn)行該函數(shù)。

并且通常情況下有提供對(duì)應(yīng)的取消方法：

  • clearTimeout：取消setTimeout的定時(shí)器；
  • clearInterval：取消setInterval的定時(shí)器；

大多數(shù)運(yùn)行環(huán)境都有內(nèi)置的調(diào)度程序，并且提供了這些方法：

  • 目前來講，所有瀏覽器以及 Node.js 都支持這兩個(gè)方法；
  • 所以我們后續(xù)學(xué)習(xí)Node的時(shí)候，也可以在Node中使用它們；

2.setTimeout的使用

setTimeout的語法如下：

let timerId = setTimeout(func|code, [delay], [arg1], [arg2], ...)

  • func|code：想要執(zhí)行的函數(shù)或代碼字符串。
    • 一般傳入的都是函數(shù)，由于某些歷史原因，支持傳入代碼字符串，但是不建議這樣做；
  • delay：執(zhí)行前的延時(shí)，以毫秒為單位（1000 毫秒 = 1 秒），默認(rèn)值是 0；
  • arg1，arg2…：要傳入被執(zhí)行函數(shù)（或代碼字符串）的參數(shù)列表；

clearTimeout方法：

  • setTimeout 在調(diào)用時(shí)會(huì)返回一個(gè)“定時(shí)器標(biāo)識(shí)符（timer identifier）”，我們可以使用它來取消執(zhí)行
function showTime() {console.log(new Date().toISOString());setTimeout("showTime()", 1000);
}
showTime();
// 或者
function showTime() {console.log(new Date().toISOString());setTimeout(showTime, 1000);
}
showTime();

3.setInterval的使用

setInterval 方法和 setTimeout 的語法相同：

  • 所有參數(shù)的意義也是相同的；
  • 不過與 setTimeout 只執(zhí)行一次不同，setInterval 是每間隔給定的時(shí)間周期性執(zhí)行；

clearInterval方法：

  • setInterval也會(huì)返回一個(gè)“定時(shí)器標(biāo)識(shí)符（timer identifier）”，我們可以通過clearInterval來取消這個(gè)定時(shí)器。

關(guān)于定時(shí)器還有一些宏任務(wù)相關(guān)的概念，我們會(huì)在JavaScript高級(jí)中講解。

二、案例實(shí)戰(zhàn)

1.輪播消息提示

<!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>.tip-bar {display: inline-flex;align-items: center;height: 30px;background-color: rgba(0,0,0,.4);border-radius: 16px;}img {width: 30px;height: 30px;border-radius: 50%;margin-right: 5px;}span {font-size: 13px;color: white;margin-right: 8px;}</style>
</head>
<body><div class="tip-bar"><img src="https://bfs.biyao.com/group1/M01/A2/67/rBACVGA_iOuAYaTxAAAPbted3yE165.png" alt=""><span>183***138對(duì)這件商品感興趣</span></div><script>// 1.從服務(wù)器拿到數(shù)據(jù)ajax/fetch請(qǐng)求let tipList = [{icon: 'https://bfs.biyao.com/group1/M01/A6/97/rBACYWBCHqyAFH5tAAANZXX5Eww646.png',title: 'coderwhy對(duì)這件商品感興趣'},{icon: 'https://bfs.biyao.com/group1/M01/A2/67/rBACVGA_iOuAYaTxAAAPbted3yE165.png',title: '123***814對(duì)這件商品感興趣'},{icon: 'https://bfs.biyao.com/group1/M00/7F/4E/rBACYV16HseAP-PnAAAW9bbVoKE463.png',title: '劉軍對(duì)這件商品感興趣'}]// 2.動(dòng)態(tài)的切換數(shù)據(jù)// 2.1.獲取元素var tipBar = document.querySelector(".tip-bar")var imgEl = tipBar.querySelector("img")var spanEl = tipBar.querySelector("span")// 2.2.3s切換一次數(shù)據(jù)var currentIndex = 0 // 記錄當(dāng)前展示到的索引位置setInterval(function() {// 1> 根據(jù)索引獲取itemvar tipItem = tipList[currentIndex]// 2> 給DOM設(shè)置內(nèi)容imgEl.src = tipItem.iconspanEl.textContent = tipItem.title// 3> 重新計(jì)算索引currentIndex++if (currentIndex === tipList.length) {currentIndex = 0}}, 3000)// 隨機(jī)// Math.floor(Math.random() * tipList.length)</script></body>
</html>

2.關(guān)閉隱藏信息

<!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>.top-bar {display: flex;flex-direction: row;align-items: center;height: 45px;width: 375px;background-color: black;/* 關(guān)鍵 */overflow: hidden;transition: all .5s ease-out;}.delete {display: flex;flex-direction: row;justify-content: center;align-items: center;height: 100%;width: 30px;cursor: pointer;}.delete img {height: 10px;width: 10px;}.logo {height: 30px;width: 30px;margin-left:3px;margin-right: 30px;cursor: pointer;}span {color: white;font-size: 14px;flex: 1;white-space: nowrap;overflow: hidden;text-overflow: ellipsis;}.btn {width: 94px;height: 100%;line-height: 45px;text-align: center;font-size: 14px;color: #fff;background-color: #F63515;}</style>
</head>
<body><div class="top-bar"><div class="delete"><img src="./img/delete.png" alt=""></div><img class="logo" src="./img/logo.png" alt=""><span>打開京東App,購物更輕松</span><div class="btn">立即打開</div></div><script>// 1.獲取元素var topBar = document.querySelector(".top-bar")var deleteEl = topBar.querySelector(".delete")// 2.監(jiān)聽delete的點(diǎn)擊deleteEl.onclick = function() {topBar.style.height = 0// setTimeout(function() {//   topBar.remove()// }, 300)}// 3.監(jiān)聽過渡動(dòng)畫結(jié)束topBar.ontransitionend = function() {topBar.remove()}</script></body>
</html>

3.側(cè)邊欄展示

<!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>.tool-bar {position: fixed;top: 30%;right: 0;display: flex;flex-direction: column;align-items: center;width: 35px;}.item {position: relative;width: 35px;height: 35px;margin-bottom: 1px;background-color: #7a6e6e;border-radius: 3px 0 0 3px;}.icon {display: inline-block;width: 100%;height: 100%;cursor: pointer;background-image: url(./img/toolbars.png);}/* .icon01 {background-position: -48px 0;}.icon02 {background-position: -48px -50px;}.icon03 {background-position: -48px -100px;}.icon04 {background-position: -48px -150px;} */.name {position: absolute;z-index: -1;right: 35px;/* left: -62px; */top: 0;width: 0;height: 35px;line-height: 35px;color: #fff;text-align: center;font-size: 12px;background-color: #7a6e6e;cursor: pointer;border-radius: 3px 0 0 3px;transition: width .2s ease;}.item:hover,.item:hover .name {background-color: #cd1926;}</style>
</head>
<body><div class="tool-bar"><div class="item"><i class="icon icon01"></i><div class="name">購物車</div></div><div class="item"><i class="icon icon02"></i><div class="name">收藏</div></div><div class="item"><i class="icon icon03"></i><div class="name">限時(shí)活動(dòng)</div></div><div class="item"><i class="icon icon04"></i><div class="name">大禮包</div></div></div><script>// 1.動(dòng)態(tài)給icon設(shè)置backgroundPositionvar iconEls = document.querySelectorAll(".icon")for (var i = 0; i < iconEls.length; i++) {var iconEl = iconEls[i]iconEl.style.backgroundPosition = `-48px -${50*i}px`}// 2.實(shí)現(xiàn)鼠標(biāo)進(jìn)入動(dòng)畫// 方案一: mouseenter(不能使用事件委托)var itemEls = document.querySelectorAll(".item")for (var itemEl of itemEls) {itemEl.onmouseenter = function() {var nameEl = this.children[1]nameEl.style.width = "62px"}itemEl.onmouseleave = function() {var nameEl = this.children[1]nameEl.style.width = "0"}}// 方案二: mouseover(使用事件委托)// var toolbarEl = document.querySelector(".tool-bar")// toolbarEl.onmouseover = function(event) {//   handleMouseEvent(event, 62)// }// toolbarEl.onmouseout = function(event) {//   handleMouseEvent(event, 0)// }// function handleMouseEvent(event, width) {//   if (event.target !== toolbarEl) {//     // var itemEl = event.target.classList.contains("item") ? event.target: event.target.parentElement//     // 1.獲取唯一的item//     var itemEl = null//     if (event.target.classList.contains("item")) {//       itemEl = event.target//     } else {//       itemEl = event.target.parentElement//     }//     // 2.根據(jù)item獲取nameElement//     var nameEl = itemEl.children[1]//     // 3.設(shè)置寬度//     nameEl.style.width = `${width}px`//   }// }</script></body>
</html>

4.登錄框

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><link rel="stylesheet" href="./css/iconfont.css"><style>body,input {margin: 0;padding: 0;outline: none;}.container {text-align: center;}.pannel {display: inline-block;padding: 30px;width: 300px;/* border-radius: 10px; *//* border: 2px solid #ccc; */}.pannel .form-item {display: flex;width: 100%;margin-bottom: 15px;border: 1px solid #ccc;}.pannel .form-item .icon {width: 40px;height: 40px;box-sizing: border-box;border-right: 1px solid #ccc;background-color: #eee;vertical-align: bottom;color: #ccc;}.pannel .form-item .icon.icon-account {font-size: 24px;line-height: 40px;}.pannel .form-item .icon.icon-password {line-height: 40px;font-size: 18px;}.pannel .form-item input {padding-left: 10px;height: 40px;flex: 1;box-sizing: border-box;border-style: none;}.pannel .form-item i {width: 20px;margin: 0 3px;font-style: normal;color: #ccc;line-height: 40px;font-size: 20px;}button {width: 100%;background-color: rgb(233, 97, 99);border-style: none;padding: 5px 0;font-size: 20px;letter-spacing: 5px;color: #fff;}</style>
</head>
<body><div class="container"><div class="pannel"><form action="/abc" method="post"><h1>登錄頁面</h1><div class="form-item"><div class="icon iconfont icon-account"></div><input type="text" name="username" id="username" placeholder="郵箱/用戶名/登錄手機(jī)"><i class="remove-icon iconfont icon-delete"></i></div><div class="form-item"><div class="icon iconfont icon-password"></div><input type="password" name="password" id="password" placeholder="密碼"><i class="hidden-icon iconfont icon-no_eye"></i><i class="remove-icon iconfont icon-delete"></i></div><button type="submit">登錄</button></form></div></div><script>var removeIconEls = document.querySelectorAll(".icon-delete");removeIconEls.forEach(function (value) {console.log(value);value.addEventListener("click", function () {console.log("當(dāng)前元素：", this);this.previousElementSibling.value = "";})})</script>
</body>
</html>

5.王者榮耀tabControl

<!DOCTYPE html>
<html lang="zh-CN">
<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>王者榮耀-main-news</title><link rel="stylesheet" href="./css/reset.css"><link rel="stylesheet" href="./css/common.css"><style>.main .section-content {display: flex;justify-content: space-between;}.main .section-content .left-content {width: 872px;height: 1000px;}.main .section-content .right-content {width: 295px;height: 500px;}</style>
</head>
<body><div class="main main_wrapper"><div class="section-content"><div class="left-content"><div class="content-center"><div class="section_header"><div class="header_left"><h3 class="title">內(nèi)容中心</h3></div><div class="header_right" href="#"><a class="more" href="#">更多</a></div></div><div class="tab_control"><div class="item active">精品欄目</div><div class="line"></div><div class="item">賽事精品</div><div class="line"></div><div class="item">英雄攻略</div></div></div></div></div><script>// 1.獲取元素var tabControl = document.querySelector(".tab_control")// 2.監(jiān)聽鼠標(biāo)進(jìn)入(事件委托)var activeLiEl = tabControl.querySelector(".active")tabControl.onmouseover = function(event) {// 1.拿到事件發(fā)生的對(duì)象var itemEl = event.targetif (itemEl.classList.contains("item")) {// 其他的取消active// 1.for循環(huán)所有的item// 2.querySelector(".active")// 3.記錄當(dāng)前的active對(duì)應(yīng)的itemactiveLiEl.classList.remove("active")// 當(dāng)前進(jìn)入的item變成activeitemEl.classList.add("active")// 將最新的itemEl變成activeLiElactiveLiEl = itemEl}}</script>
</body>
</html>

6.王者輪播圖

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>body {margin: 0;padding: 0;}a {text-decoration: none;}.box {width: 604px;height: 342px;margin: 0 auto;overflow: hidden;}.pic {display: flex;width: 100%;height: 298px;transition: all 300ms ease;}.pic .banner {flex: 1;}.btn {display: flex;height: 44px;background-color: #000;}.btn a {flex: 1;line-height: 44px;font-size: 14px;text-align: center;color: #b1b2be;}.btn a.active,.btn a:hover {color: #f3c258;background-color: rgba(255, 255, 255, 0.15);}</style>
</head>
<body><div class="box"><div class="pic"><a href="#" class="banner"><img src="./images/banner01.jpeg" alt="海諾設(shè)計(jì)理念"></a><a href="#" class="banner"><img src="./images/banner02.jpeg" alt="季后賽宣傳片"></a><a href="#" class="banner"><img src="./images/banner03.jpeg" alt="KPL選秀招募"></a><a href="#" class="banner"><img src="./images/banner04.jpeg" alt="榮耀大話王"></a><a href="#" class="banner"><img src="./images/banner05.jpeg" alt="虔誠人物志"></a></div><div class="btn"><a href="#" class="active">海諾設(shè)計(jì)理念</a><a href="#">季后賽宣傳片</a><a href="#">KPL選秀招募</a><a href="#">榮耀大話王</a><a href="#">虔誠人物志</a></div></div><script>// 獲取bannervar boxEl = document.querySelector(".box");var picEl = document.querySelector(".pic");var btnEl = document.querySelector(".btn");var index = 0;var activeBtn = document.querySelector(".active");// 輪播圖var bannerTimer = exeBanner();// 按鈕鼠標(biāo)切換boxEl.onmouseover = function (event) {// 暫停輪播clearInterval(bannerTimer);// 判斷是否為按鈕，不是則返回if (event.target.parentElement !== btnEl ||event.target === activeBtn) return;//切換按鈕激活changeActive(event.target);// 切換對(duì)應(yīng)的banner// 找到當(dāng)前按鈕的indexindex = Array.from(btnEl.children).indexOf(activeBtn);picEl.style.transform = `translate(-${604*index}px, 0)`;}boxEl.onmouseleave = function (event) {// 開始輪播bannerTimer = exeBanner();}// 改變激活按鈕元素function changeActive(activeEl) {activeBtn.classList.remove("active");activeBtn = activeEl;activeBtn.classList.add("active");}// 執(zhí)行輪播function exeBanner(params) {return setInterval(() => {// banner圖移動(dòng)picEl.style.transform = `translate(-${604*index}px, 0)`;// 按鈕切換changeActive(btnEl.children[index]);index++;if (index === picEl.children.length) {index = 0;}}, 3000);}</script>
</body>
</html>

原版

<!DOCTYPE html>
<html lang="zh">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>body {margin: 0;padding: 0;}a {text-decoration: none;}.box {width: 604px;height: 342px;margin: 0 auto;overflow: hidden;}.pic {display: flex;position: relative;width: 100%;height: 298px;}.pic .banner {position: absolute;flex: 1;/* transition: all 2000ms ease; */}.btn {display: flex;height: 44px;background-color: #000;}.btn a {flex: 1;line-height: 44px;font-size: 14px;text-align: center;color: #b1b2be;}.btn a.active,.btn a:hover {color: #f3c258;background-color: rgba(255, 255, 255, 0.15);}</style>
</head>
<body><div class="box"><div class="pic"><a href="#" class="banner"><img src="./images/banner01.jpeg" alt="海諾設(shè)計(jì)理念"></a><a href="#" class="banner"><img src="./images/banner02.jpeg" alt="季后賽宣傳片"></a><a href="#" class="banner"><img src="./images/banner03.jpeg" alt="KPL選秀招募"></a><a href="#" class="banner"><img src="./images/banner04.jpeg" alt="榮耀大話王"></a><a href="#" class="banner"><img src="./images/banner05.jpeg" alt="虔誠人物志"></a></div><div class="btn"><a href="#" class="active">海諾設(shè)計(jì)理念</a><a href="#">季后賽宣傳片</a><a href="#">KPL選秀招募</a><a href="#">榮耀大話王</a><a href="#">虔誠人物志</a></div></div><script>// 獲取bannervar boxEl = document.querySelector(".box");var picEl = document.querySelector(".pic");var btnEl = document.querySelector(".btn");var index = 0;var lastIndex = index;var activeBtn = document.querySelector(".active");// 輪播圖var bannerTimer = exeBanner();// 按鈕鼠標(biāo)切換boxEl.onmouseover = function (event) {// 暫停輪播clearInterval(bannerTimer);// 判斷是否為按鈕，不是則返回if (event.target.parentElement !== btnEl ||event.target === activeBtn) return;//切換按鈕激活changeActive(event.target);// 切換對(duì)應(yīng)的banner// 找到當(dāng)前按鈕的indexlastIndex = index;index = Array.from(btnEl.children).indexOf(activeBtn);bannerMove();;}boxEl.onmouseleave = function (event) {// 開始輪播bannerTimer = exeBanner();}// 改變激活按鈕元素function changeActive(activeEl) {activeBtn.classList.remove("active");activeBtn = activeEl;activeBtn.classList.add("active");}// 執(zhí)行輪播function exeBanner(params) {return setInterval(() => {// 切換輪播圖bannerMove();// 切換按鈕changeActive(btnEl.children[index]);lastIndex = index;index++;// 重置indexif (index === picEl.children.length) {index = 0;}}, 3000);}// 輪播圖移動(dòng)function bannerMove() {// 給上一張和下一張?zhí)砑觿?dòng)畫for (var i = 0; i < picEl.children.length; i++) {if (i === lastIndex || i === index) {picEl.children[i].style.transition = "all 300ms ease";continue;}picEl.children[i].style.transition = "none";}// banner圖移動(dòng)if (index > 0) {for (var i = 0; i < index; i++) {picEl.children[i].style.left = "-100%";}}if (index === 0) {for (var i = 1; i < picEl.children.length; i++) {picEl.children[i].style.left = "100%";}}picEl.children[index].style.left = "0%";if (index < picEl.children.length - 1) {for (var i = index+1; i < picEl.children.length; i++) {picEl.children[i].style.left = "100%";}}}</script>
</body>
</html>

7.書籍購物車

<!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>table {border-collapse: collapse;}thead {background-color: #f5f5f5;}th, td {border: 1px solid #aaa;padding: 8px 12px;text-align: center;}</style>
</head>
<body><table><thead><tr><th>編號(hào)</th><th>書籍名稱</th><th>出版日期</th><th>價(jià)格</th><th>購買數(shù)量</th><th>操作</th></tr></thead><tbody></tbody></table><h2 class="price">總價(jià)格: ￥<span class="price-count">0</span></h2><script>// 1.從服務(wù)器獲取數(shù)據(jù) ajax/fetchvar books = [{id: 1,name: '《算法導(dǎo)論》',date: '2006-09',price: 85.00,count: 3},{id: 2,name: '《UNIX編程藝術(shù)》',date: '2006-02',price: 59.00,count: 2},{id: 3,name: '《編程珠璣》',date: '2008-10',price: 39.00,count: 5},{id: 4,name: '《代碼大全》',date: '2006-03',price: 128.00,count: 8}]// 2.對(duì)數(shù)據(jù)展示// 到底通過html直接編寫, 還是通過JavaScriptDOM操作創(chuàng)建元素// 1> 對(duì)于固定的, 直接通過html編寫(能通過html編寫, 盡量通過html直接編寫)// 2> 對(duì)于哪些大量的數(shù)據(jù), 有規(guī)律的數(shù)據(jù), 可以通過JavaScript編寫var tbodyEl = document.querySelector("tbody")// 2.2. 動(dòng)態(tài)添加tr以及內(nèi)部數(shù)據(jù)for (var i = 0; i < books.length; i++) {var trowEl = document.createElement("tr")// 2.3. 放具體數(shù)據(jù)var book = books[i]var bookKeys = Object.keys(book)for (var m = 0; m < bookKeys.length; m++) {var key = bookKeys[m]var value = book[key]var tdEl = document.createElement("td")if (key === "price") {value = "￥" + value}tdEl.textContent = valuetrowEl.append(tdEl)}// 2.4. 添加刪除按鈕var deleteTdEl = document.createElement("td")var deleteBtnEl = document.createElement("button")deleteBtnEl.textContent = "刪除"deleteTdEl.append(deleteBtnEl)trowEl.append(deleteTdEl)// 2.5.監(jiān)聽刪除按鈕的點(diǎn)擊deleteBtnEl.onclick = function() {// 1.刪除對(duì)應(yīng)的trowvar deleteTRowEl = this.parentElement.parentElementvar deleteTrIndex = deleteTRowEl.sectionRowIndexdeleteTRowEl.remove()// 2.刪除對(duì)應(yīng)books中的數(shù)據(jù)books.splice(deleteTrIndex, 1)// 3.重新計(jì)算一次價(jià)格calcTotalPrice()}tbodyEl.append(trowEl)}// 3.計(jì)算總價(jià)格var priceCountEl = document.querySelector(".price-count")calcTotalPrice()// 封裝計(jì)算價(jià)格的函數(shù)function calcTotalPrice() {var totalPrice = books.reduce(function(preValue, item) {return preValue + item.count * item.price}, 0)priceCountEl.textContent = totalPrice}</script></body>
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