文章目录
- 01-事件监听
- 02-点击关闭广告
- 03-随机点名案例
- 04-鼠标经过或离开事件
- 05-可点击的轮播图
- 06-小米搜索框
- 07-键盘类型事件
- 08-键盘事件-发布评论案例
- 09-focus选择器
- 10-评论回车发布
- 11-事件对象
- 12-trim方法
- 13-环境对象
- 14-回调函数
- 15-tab栏切换
01-事件监听
<!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><button>点击</button><script>// 事件源const btn = document.querySelector('button')// 时间侦听btn.addEventListener('click', function () {alert('弹窗')})</script>
</body></html>
02-点击关闭广告
<!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>.box {position: relative;width: 1000px;height: 200px;background-color: pink;margin: 100px auto;text-align: center;font-size: 50px;line-height: 200px;font-weight: 700;}.box1 {position: absolute;right: 20px;top: 10px;width: 20px;height: 20px;background-color: skyblue;text-align: center;line-height: 20px;font-size: 16px;cursor: pointer;}</style>
</head><body><div class="box">我是广告<div class="box1">X</div></div><script>// 1. 获取事件源const box1 = document.querySelector('.box1')// 关闭的是大盒子const box = document.querySelector('.box')// 2. 事件侦听box1.addEventListener('click', function () {box.style.display = 'none'})</script>
</body></html>
03-随机点名案例
<!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>* {margin: 0;padding: 0;}h2 {text-align: center;}.box {width: 600px;margin: 50px auto;display: flex;font-size: 25px;line-height: 40px;}.qs {width: 450px;height: 40px;color: red;}.btns {text-align: center;}.btns button {width: 120px;height: 35px;margin: 0 50px;}</style>
</head>
<!-- 业务分析:1点击开始按钮随机抽取数组的一个数据，放到页面中2点击结束按钮删除数组当前抽取的一个数据3当抽取到最后一个数据的时候，两个按钮同时禁用(写点开始里面，只剩最后一个数据不用抽了)核心:利用定时器快速展示，停止定时器结束展示 --><body><h2>随机点名</h2><div class="box"><span>名字是：</span><div class="qs">这里显示姓名</div></div><div class="btns"><button class="start">开始</button><button class="end">结束</button></div><script>// 数据数组const arr = ['马超', '黄忠', '赵云', '关羽', '张飞']// 业务1：开始按钮模块// 定时器编号设置为全局变量let n = 0// 数组下标设置为全局变量let random = 0const start = document.querySelector('.start')const qs = document.querySelector('.qs')start.addEventListener('click', function () {n = setInterval(function () {random = Math.floor(Math.random() * arr.length)qs.innerHTML = `${arr[random]}`}, 50)// 如果数组只剩一个元素：把两个按钮都禁用if (arr.length === 1) {start.disabled = trueend.disabled = true}})// 业务2：结束模块const end = document.querySelector('.end')end.addEventListener('click', function () {clearInterval(n)arr.splice(random, 1)})</script>
</body></html>
04-鼠标经过或离开事件
<!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>div {width: 200px;height: 200px;background-color: pink;}</style>
</head><body><div></div><script>const div = document.querySelector('div')// 鼠标经过div.addEventListener('mouseenter', function () {console.log(`轻轻的我来了`)})// 鼠标离开div.addEventListener('mouseleave', function () {console.log(`轻轻的我走了`)})</script>
</body></html>
05-可点击的轮播图
<!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>轮播图点击切换</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>对人类来说会不会太超前了？</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>// 1. 初始数据const sliderData = [{ url: './images/slider01.jpg', title: '对人类来说会不会太超前了？', color: 'rgb(100, 67, 68)' },{ url: './images/slider02.jpg', title: '开启剑与雪的黑暗传说！', color: 'rgb(43, 35, 26)' },{ url: './images/slider03.jpg', title: '真正的jo厨出现了！', color: 'rgb(36, 31, 33)' },{ url: './images/slider04.jpg', title: '李玉刚：让世界通过B站看到东方大国文化', color: 'rgb(139, 98, 66)' },{ url: './images/slider05.jpg', title: '快来分享你的寒假日常吧~', color: 'rgb(67, 90, 92)' },{ url: './images/slider06.jpg', title: '哔哩哔哩小年YEAH', color: 'rgb(166, 131, 143)' },{ url: './images/slider07.jpg', title: '一站式解决你的电脑配置问题！！！', color: 'rgb(53, 29, 25)' },{ url: './images/slider08.jpg', title: '谁不想和小猫咪贴贴呢！', color: 'rgb(99, 72, 114)' },]//右侧按钮服务：点击图变 字变 颜色变 小圆点变 点击到最后一个之后从新开始let i = 0const next = document.querySelector('.next')const img = document.querySelector('.slider-wrapper img')const p = document.querySelector('.slider-footer p')next.addEventListener('click', function () {i++if (i >= sliderData.length) {i = 0}toggle()})//左侧按钮服务：点击图变 字变 颜色变 小圆点变 点击到最后一个之后从新开始const prev = document.querySelector('.prev')prev.addEventListener('click', function () {i--if (i < 0) {i = sliderData.length - 1}toggle()})// 定时模块let timer = setInterval(function () {next.click()}, 1000)// 鼠标经过功能：关闭定时器const slider = document.querySelector('.slider')slider.addEventListener('mouseenter', function () {clearInterval(timer)})// 鼠标离开：打开定时器slider.addEventListener('mouseleave', function () {clearInterval(timer)timer = setInterval(function () {next.click()}, 1000)})// 把重复代码用函数封装起来function toggle() {img.src = sliderData[i].urlp.innerHTML = sliderData[i].titledocument.querySelector('.slider-footer').style.backgroundColor = sliderData[i].colordocument.querySelector('.slider-indicator .active').classList.remove('active')document.querySelector(`.slider-footer li:nth-child(${i + 1})`).classList.add('active')}</script>
</body></html>
06-小米搜索框
<!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;}ul {display: none;list-style: none;}.mi {position: relative;width: 223px;margin: 100px auto;}.mi input {width: 223px;height: 48px;padding: 0 10px;font-size: 14px;line-height: 48px;border: 1px solid #e0e0e0;outline: none;}.mi .search {border: 1px solid #ff6700;}.result-list {position: absolute;left: 0;top: 48px;width: 223px;border: 1px solid #ff6700;border-top: 0;background: #fff;}.result-list a {display: block;padding: 6px 15px;font-size: 12px;color: #424242;text-decoration: none;}.result-list a:hover {background-color: #eee;}</style></head><body><div class="mi"><input type="search" placeholder="小米笔记本"><ul class="result-list"><li><a href="#">全部商品</a></li><li><a href="#">小米11</a></li><li><a href="#">小米10S</a></li><li><a href="#">小米笔记本</a></li><li><a href="#">小米手机</a></li><li><a href="#">黑鲨4</a></li><li><a href="#">空调</a></li></ul></div><script>const input = document.querySelector('input')const ul = document.querySelector('ul')// 焦点放置：显示下拉菜单+搜索框变颜色input.addEventListener('focus', function () {ul.style.display = 'block'input.classList.add('search')})// 焦点离开：下拉菜单不显示input.addEventListener('blur', function () {ul.style.display = 'none'input.classList.remove('search')})</script>
</body></html>
07-键盘类型事件
08-键盘事件-发布评论案例
<!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><input type="text" name="" id=""><script>const input = document.querySelector('input')input.addEventListener('input', function () {console.log(input.value)})</script>
</body></html>
09-focus选择器
<!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>input {width: 220px;transition: all .3s;}input:focus {width: 300px;}</style>
</head><body><input type="text">
</body></html>
10-评论回车发布
<!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>评论回车发布</title><style>.wrapper {min-width: 400px;max-width: 800px;display: flex;justify-content: flex-end;}.avatar {width: 48px;height: 48px;border-radius: 50%;overflow: hidden;background: url(./images/avatar.jpg) no-repeat center / cover;margin-right: 20px;}.wrapper textarea {outline: none;border-color: transparent;resize: none;background: #f5f5f5;border-radius: 4px;flex: 1;padding: 10px;transition: all 0.5s;height: 30px;}.wrapper textarea:focus {border-color: #e4e4e4;background: #fff;height: 50px;}.wrapper button {background: #00aeec;color: #fff;border: none;border-radius: 4px;margin-left: 10px;width: 70px;cursor: pointer;}.wrapper .total {margin-right: 80px;color: #999;margin-top: 5px;opacity: 0;transition: all 0.5s;}.list {min-width: 400px;max-width: 800px;display: flex;}.list .item {width: 100%;display: flex;}.list .item .info {flex: 1;border-bottom: 1px dashed #e4e4e4;padding-bottom: 10px;}.list .item p {margin: 0;}.list .item .name {color: #FB7299;font-size: 14px;font-weight: bold;}.list .item .text {color: #333;padding: 10px 0;}.list .item .time {color: #999;font-size: 12px;}</style>
</head><body><div class="wrapper"><i class="avatar"></i><textarea id="tx" placeholder="发一条友善的评论" rows="2" maxlength="200"></textarea><button>发布</button></div><div class="wrapper"><span class="total">0/200字</span></div><div class="list"><div class="item" style="display: none;"><i class="avatar"></i><div class="info"><p class="name">清风徐来</p><p class="text">大家都辛苦啦，感谢各位大大的努力，能圆满完成真是太好了[笑哭][支持]</p><p class="time">2022-10-10 20:29:21</p></div></div></div><script>const textarea = document.querySelector('#tx')const total = document.querySelector('.total')const item = document.querySelector('.item')const text = document.querySelector('.text')// 文本域获得焦点 字数显示textarea.addEventListener('focus', function () {total.style.opacity = 1// total.value = `${textarea.value.length}/200字`})// 文本域失去焦点 字数隐藏textarea.addEventListener('blur', function () {total.style.opacity = 0})// 检测光标输入事件textarea.addEventListener('input', function () {// console.log(textarea.value.length)total.innerHTML = `${textarea.value.length}/200字`})// 按下回车发布评论textarea.addEventListener('keyup', function (e) {// 只有按下的是回车键，才会触发if (e.key === 'Enter') {if (textarea.value.trim() !== '') {// 这个if等价于if(textarea.value.trim())// 消除空字符串的bugitem.style.display = 'block'text.innerHTML = textarea.value}// 回车完成之后清空文本域textarea.value = ''// 回车完成之后清字数统计 复原total.innerHTML = '0/200字'}})</script>
</body></html>
11-事件对象
<!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><button>点击</button><input type="text"><script>// const btn = document.querySelector('button')// btn.addEventListener('click', function (e) {// console.log(e)// })const input = document.querySelector('input')input.addEventListener('keyup', function (e) {console.log(e.key)if (e.key === 'Enter') {console.log('回车')}})</script>
</body></html>
12-trim方法
<!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><script>const str = ' im a teachr 'console.log(str.trim())// 去除字符串左右空格</script>
</body></html>
13-环境对象
<!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><!-- 环境对象this:代表着当前函数运行时所处的环境 --><!-- this指向：谁调用this 就指向谁 --><button>按钮</button><script>function fn() {console.log(this)// 这个指向windows}const button = document.querySelector('button')button.addEventListener('click', function () {console.log(this)// 这个指向buttonbutton.style.color = 'red'// 等价于:this.style.color = 'red'})</script>
</body></html>
14-回调函数
<!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><!-- 函数A作为参数传给函数B A就叫回调函数 --><script>function fn() {console.log(101)}setInterval(fn, 1000)// fn就是回调函数</script>
</body></html>
15-tab栏切换
<!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>tab栏切换</title><style>* {margin: 0;padding: 0;}.tab {width: 590px;height: 340px;margin: 20px;border: 1px solid #e4e4e4;}.tab-nav {width: 100%;height: 60px;line-height: 60px;display: flex;justify-content: space-between;}.tab-nav h3 {font-size: 24px;font-weight: normal;margin-left: 20px;}.tab-nav ul {list-style: none;display: flex;justify-content: flex-end;}.tab-nav ul li {margin: 0 20px;font-size: 14px;}.tab-nav ul li a {text-decoration: none;border-bottom: 2px solid transparent;color: #333;}.tab-nav ul li a.active {border-color: #e1251b;color: #e1251b;}.tab-content {padding: 0 16px;}.tab-content .item {display: none;}.tab-content .item.active {display: block;}</style>
</head><body><div class="tab"><div class="tab-nav"><h3>每日特价</h3><ul><li><a class="active" href="javascript:;">精选</a></li><li><a href="javascript:;">美食</a></li><li><a href="javascript:;">百货</a></li><li><a href="javascript:;">个护</a></li><li><a href="javascript:;">预告</a></li></ul></div><div class="tab-content"><div class="item active"><img src="./images/tab00.png" alt="" /></div><div class="item"><img src="./images/tab01.png" alt="" /></div><div class="item"><img src="./images/tab02.png" alt="" /></div><div class="item"><img src="./images/tab03.png" alt="" /></div><div class="item"><img src="./images/tab04.png" alt="" /></div></div></div><script>const as = document.querySelectorAll('.tab-nav li a')for (let i = 0; i < as.length; i++) {as[i].addEventListener('mouseenter', function () {document.querySelector('.tab-nav li .active').classList.remove('active')this.classList.add('active')document.querySelector('.tab-content .active').classList.remove('active')document.querySelector(`.tab-content .item:nth-child(${i + 1})`).classList.add('active')})}</script>
</body></html>
