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This article is to share with you about how JavaScript implements the carousel graph. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Use a simple rotation diagram written by the timer, and look directly at the code, as follows:

1.css code

* {margin: 0; padding: 0; box-sizing: border-box;} body {font-size: 14px; font-family: Arial, Helvetica, sans-serif;}. Slider-box {width: 1226px; height: 460px; margin: 10px auto; overflow: hidden; position: relative } .slider-box .images a {width: 100%; height: 460px; position: absolute; left: 0; top: 0; opacity: 0; transition: all 2s;} .slider-box .images a.active {opacity: 1;} .slider-box .images an img {width: 100% Height: 100%; display: block;}. Slider-box .nav {position: absolute; left: 0; top: 195px; width: 100%; / * background-color: red; * / padding: 0 10px; / * height: 100px * /} .slider-box .nav a {background-image: url (img/icons.png); width: 41px; height: 69px; display: inline-block; background-repeat: no-repeat;} .slider-box .nav .prev {background-position:-84px 0 } .slider-box .nav .prev: hover {background-position: 00;} .slider-box .nav. Next {background-position:-125px 0; float: right;} .slider-box .nav. Next: hover {background-position:-42px 0;} .slider-box .pages {position: absolute Right: 20px; bottom: 25px; font-size: 0; width: 1186px; text-align: center; / * background-color: rebeccapurple; * /} .slider-box .pages .dot {display: inline-block; width: 10px; height: 10px; border-radius: 50% Background-color: rgba; margin-right: 10px;} .slider-box .pages .dot: hover {background-color: yellow;} .slider-box .pages .dot.active {background-color: yellow;}

2.html code

3.js code

/ / var images = document.querySelectorAll ('.images a') var index = 0 / / defines the index of the picture to be played var pages = document.querySelectorAll (".dot") var prev = document.querySelector (".prev") var next = document.querySelector (".next") / / switch the picture according to the index value / / find the a tag of images Add the class active function showImage (idx) {images.forEach (function (v) I) {/ / idx = 1 / / I = 0 1234 if (i===idx) {v.classList.add ('active') / / Control the corresponding point highlights pages [I] .classList.add ("active")} else { V.classList.remove ('active') pages [I] .classList.remove ("active")})} / / showImage (3) prev.onclick = function () {if (index===0) {index= images.length-1 pick / 4} else {index= index -1} showImage (index)} next.onclick = function () {if (index===images.length-1) {index= 0} else {index+=1} showImage (index)} var timer = setInterval (function () {/ / timer controls the switching of the picture as well as clicking the next one / / call the next click action next.click () / / simulate the click action of next} 3000) Thank you for reading! This is the end of the article on "how to realize the JavaScript broadcast map". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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