原生JS实现图片轮播 JS实现小广告插件
最近想用原生JS多实现一些小功能,现在写到博客里,大家可以借鉴,有问题欢迎指出。
轮播图
需求:
图片循环轮播,可点击左右切换,切换状态与<li>绑定,鼠标移入图片悬停,鼠标移出图片继续循环切换。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>原生js轮播图片</title> </head> <style> .container{ width: 100%; height: 500px; position: relative; } .content{ width: 900px; height: 450px; position: relative; overflow: hidden; border: 1px solid seagreen; margin: 0 auto; } .slider-img{ width: 900px; height: 450px; margin: 10px auto; } .slider-img img{ vertical-align: top; width: 800px; height: 400px; margin: 10px 50px; display: block; } .left{ margin-top: -300px; margin-left: 50px; width: 100px; height: 100px; } .left img,.right img{ width: 100px; height: 100px; } .right{ margin-top: -100px; margin-right: 50px; float: right; width: 100px; height: 100px; } .dot{ position: relative; top: 23%; left: 43%; width: 50%; } .dotul{ width: 450px; } .dotul li{ width: 20px; height: 20px; background-color: seagreen; list-style: none; float: left; border-radius: 20px; margin-left: 15px; z-index: 999; cursor: pointer; } .active{ background-color: orangered !important; } </style> <body> <div class="container" id="container"> <div class="content" id="content"> <div class="slider-img" id="slider" > <a href="javascript:;" > <img src="./img/88.jpg" alt="" id="img"> </a> </div> </div> <div class="btn"> <div class="left" id="left"> <a href=" ###" ><img src=""></a> </div> <div class="right" id="right"> <a href=" ###" ><img src=""></a> </div> </div> <div class="dot"> <ul id="ul" class="dotul"> <li class="active"></li> <li></li> <li></li> <li></li> </ul> </div> </div>
js代码,使用时记得在html里引入JS。
var container = document.getElementById("container"); var content = document.getElementById("content"); var slider = document.getElementById("slider"); var img = document.getElementById("img"); var ul = document.getElementById("ul"); var li = document.getElementsByTagName("li"); var left = document.getElementById("left"); var right = document.getElementById("right"); var num = 0; var timer = null; var picList = ["./img/88.jpg","./img/are.jpg","./img/family.jpg","./img/one.jpg"]; //将li与list下标对应 //设置展示图片的方法,展示时,li的圆点与图片绑定在一起 ShowPicture = function() { img.src = picList[num]; for(var i = 0 ; i < li.length;i++) { li[i].className = ''; } li[num].className = 'active'; } //左点击,如果已经是第一张了就返回最后一张 left.onclick = function() { num--; if(num < 0) { num = picList.length-1; } ShowPicture(); } //右点击,若已经是最后一张返回第一张 right.onclick = function() { num++; if(num >= picList.length) { //3 num = 0; } ShowPicture(); } //实现点击圆点跳转对应图片,将li与list下标对应list.index=li.index for(var i = 0; i < picList.length ; i++) { li[i].index = i; li[i].onclick = function() { num = this.index; ShowPicture(); } } //自动轮播图片,每次调用要记得清除定时器,并在调用后回归定时器,防止时间差越变越大 autoChange = function() { clearInterval(timer); timer = setInterval(() => { num++; num %= picList.length; ShowPicture(); }, 3000); return timer; } window.onload = autoChange; //事件 img.onmouseover = function() { clearInterval(timer); } img.onmouseleave = autoChange;
广告插件
需求:页面加载结束后弹出广告,广告轮播展示,鼠标移入悬停,移出继续展示,点X可删除。
<div id="win"> <img id = "img" /> <button id = "ad_btn">X</button> //我这是练习,叉号用的X替代,自己做项目加入时可以换成Icon </div>
//页面加载结束弹出广告,广告切换展示,点击X可删除, var ad = document.getElementById('win'); var img = document.getElementById('img'); var ad_btn = document.getElementById('ad_btn'); var timer; window.onload = function () { // clearInterval(timer); timer = setTimeout(() => { ad.style.display = 'block'; }, 2000); change(); } var count=0; var num = 0; var imgTimer = null; //picture srcList var picList = ['../img/88.jpg','../img/one.jpg','../img/family.jpg','../img/are.jpg']; function change() { clearInterval(imgTimer) imgTimer = setInterval(() => { if(count === picList.length) { count = 0; resetShow(); } else { startShow(); } count++; }, 3000); } function resetShow() { img.src = picList[0]; num = 0; startShow(); } function startShow() { if(num < picList.length) { img.src = picList[num++]; } else { resetShow(); } } ad_btn.addEventListener('click' , (e)=>{ ad.style.display = 'none'; clearTimeout(timer) }); ad.addEventListener('mouseover' , ()=>{ clearInterval(imgTimer); }) ad.onmouseleave = function() { change(); }
实现展示:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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