本文實例為大家分享了js+html+css實現(xiàn)手動輪播和自動輪播的具體代碼,供大家參考,具體內(nèi)容如下
原理:設(shè)置圖片層的總長=單張圖片長度*張數(shù);在輪播層中利用overflow只留出一張圖片的顯示; 通過圖片層的left來顯示輪播的每一張圖,第一張為0,為了后面的圖片顯示,left的值左移為負(fù)數(shù)。
原理圖
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<!DOCTYPE html> < html > < head > < meta charset = "utf-8" > < title >輪播圖</ title > <!-- <script type="text/javascript" src="demo.js"></script> --> </ head > < style type = "text/css" > *{ margin: 0; padding: 0; } ul{ list-style: none; } a{ text-decoration: none; } #container{ position: relative; width: 500px; height: 260px; margin: 20px auto; overflow: hidden; /*溢出隱藏:只顯示一張圖片*/ } #container .parent{ position: absolute; width: 2500px; /*整個圖片層長度:500*5=2500*/ height: 260px; } #container .parent li{ float: left; width: 500px; height: 100%; } #container .parent li img{ width: 100%; height: 100%; } #container .btnLeft, #container .btnRight{ width: 30px; height: 30px; background-color: #9E9E9E; border-radius: 20%; opacity: 80%; position: absolute; /*包含塊為圖片顯示層container*/ top: 0; bottom: 0; margin: auto; font-size: 20px; color: #f40; text-align: center; line-height: 30px; } #container .btnLeft{ left: 10px; } #container .btnRight{ right: 10px; } #container .btnLeft:hover, #container .btnRight:hover{ opacity: 90%; cursor: pointer; } /*蒙層*/ #container .modal{ width: 100%; height: 40px; background: rgba(0,0,0,.3); position: absolute; left: 0; bottom: 0; line-height: 40px; padding: 0 40px; box-sizing: border-box; } #container .modal .title{ float: left; color: #fff; font-size: 12px; } #container .modal .dots{ float: right; position: absolute; bottom: 10px; left: 340px; } #container .modal .dots li{ width: 15px; height: 15px; border-radius: 50%; float: left; /*可以使用行塊盒*/ /*display: inline-block;*/ margin: 0 5px; cursor: pointer; } .clearfix::after{ content: ""; display: block; clear: both; } .on{ background-color: red; } .off{ background-color: gray; } </ style > < body > < div id = "container" > < ul class = "parent" style = "left: 0;" > < li >< img src = "1.jpg" ></ li > < li >< img src = "2.jpg" ></ li > < li >< img src = "3.jpg" ></ li > < li >< img src = "4.jpg" ></ li > < li >< img src = "5.jpg" ></ li > </ ul > < div class = "btnLeft" ><</ div > < div class = "btnRight" >></ div > < div class = "modal" > < div class = "title" > < h2 >輪播圖</ h2 > </ div > < div class = "dots" > < ul class = "clearfix" > < li class = "on" ></ li > < li class = "off" ></ li > < li class = "off" ></ li > < li class = "off" ></ li > < li class = "off" ></ li > </ ul > </ div > </ div > </ div > < script type = "text/javascript" > var imgShow = document.getElementsByClassName('parent')[0], dotList = document.querySelectorAll('.dots >.clearfix > li'); var btnLeft = document.getElementsByClassName('btnLeft')[0], btnRight = document.getElementsByClassName('btnRight')[0]; var dotLen = dotList.length, index = 0; //輪播層的圖片索引,0表示第一張 //圓點顯示 function showRadius() { for(var i = 0; i < dotLen ; i++) { if(dotList[i].className === "on"){ dotList[i] .className = "off" ; } } dotList[index] .className = "on" ; } //向左移動 btnLeft.onclick = function () { index--; if(index < 0){ /*第1張向左時,變?yōu)榈?張*/ index = 4 ; } showRadius(); var left; var imgLeft = imgShow .style.left; if(imgLeft === "0px") { /*當(dāng)是第1張時,每張圖片左移,移4張圖,位置為-(4*500)*/ left = -2000; } else{ left = parseInt (imgLeft) + 500; /*由于left為負(fù)數(shù),每左移一張加500*/ } imgShow.style.left = left + "px"; } //向右移動 btnRight.onclick = function () { index++; if(index > 4){ /*第5張向右時,變?yōu)榈?張*/ index = 0; } showRadius(); var right; var imgLeft = imgShow.style.left; if(imgLeft === "-2000px") { /*當(dāng)是第5張時,第1張的位置為0*/ right = 0; } else{ right = parseInt(imgLeft) - 500; /*由于left為負(fù)數(shù),每右移一張減500*/ } imgShow.style.left = right + "px"; } // 自動輪播 /*var timer; function autoPlay() { timer = setInterval(function() { var right; var imgLeft = imgShow.style.left; if(imgLeft === "-2000px") { right = 0; } else{ right = parseInt(imgLeft) - 500; } imgShow.style.left = right + "px"; } ,1000) } autoPlay();*/ for(var i = 0; i < dotLen ; i++) { /*利用閉包傳遞索引*/ (function(i) { dotList[i] .onclick = function () { var dis = index - i; //當(dāng)前位置和點擊的距離 imgShow.style.left = (parseInt(imgShow.style.left) + dis * 500) + "px"; index = i; //顯示當(dāng)前位置的圓點 showRadius(); } })(i); } </script> </ body > </ html > |
效果:按鈕左右滑動圖片,圖片上的小圓點也可以選擇圖片。
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持服務(wù)器之家。
原文鏈接:https://blog.csdn.net/m0_37922443/article/details/106859787