文章轉載自: 十五分鐘用 JavaScript 基礎寫一個圖片輪播效果 + 思路詳解 (原文有詳細講解)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>slideshow</title>
<style>
img {
width: 100%;
}
.li_img {
width: 800px;
float: left;
list-style: none;
}
.ul_img {
width: 6000px;
padding: 0px;
margin: 0px;
transition: all 2s;
}
.main_div {
width: 800px;
overflow: hidden;
position: relative;
top: 100px;
left: 350px;
}
.arrows {
z-index: 9999;
position: absolute;
padding-top: 230px;
width: 800px;
}
.arrows span {
font-size: 3em;
color: seashell;
}
.arrows span:hover {
/*變小手*/
cursor: pointer;
background-color: rgba(192, 192, 192, 0.29);
}
.div_btn {
float: left;
border-radius: 100px;
background-color: aquamarine;
width: 60px;
height: 10px;
margin-left: 10px;
margin-top: 130px;
}
.div_btn:hover {
background-color: aqua;
}
</style>
<script>
var count = 0;
var isgo = false;
var timer;
window.onload = function () {
var ul_img = document.getElementsByClassName("ul_img")[0];
var li_img = document.getElementsByClassName("li_img");
var arrow = document.getElementsByClassName("arrow");
var div_btn = document.getElementsByClassName("div_btn");
div_btn[0].style.backgroundColor = "aqua";
showtime();
function showtime() {
timer = setInterval(function () {
if (isgo == false) {
count++;
ul_img.style.transform = "translate(" + -800 * count + "px)";
if (count >= li_img.length - 1) {
count = li_img.length - 1;
isgo = true;
}
} else {
count--;
ul_img.style.transform = "translate(" + -800 * count + "px)";
if (count <= 0) {
count = 0;
isgo = false;
}
}
for (var i = 0; i < div_btn.length; i++) {
div_btn[i].style.backgroundColor = "aquamarine";
}
div_btn[count].style.backgroundColor = "aqua";
}, 4000)
}
for (var i = 0; i < arrow.length; i++) {
arrow[i].onmouseover = function () {
clearInterval(timer);
}
arrow[i].onmouseout = function () {
showtime();
}
arrow[i].onclick = function () {
if (this.title == 0) {
count++;
if (count > 3) {
count = 0;
}
} else {
count--;
if (count < 0) {
count = 3;
}
}
ul_img.style.transform = "translate(" + -800 * count + "px)";
for (var i = 0; i < div_btn.length; i++) {
div_btn[i].style.backgroundColor = "aquamarine";
}
div_btn[count].style.backgroundColor = "aqua";
}
}
for (var b = 0; b < div_btn.length; b++) {
div_btn[b].index = b;
div_btn[b].onmouseover = function () {
clearInterval(timer);
for (var a = 0; a < div_btn.length; a++) {
div_btn[a].style.backgroundColor = "aquamarine";
}
div_btn[this.index].style.backgroundColor = "aqua";
if (this.index == 3) {
isgo = true;
}
if (this.index == 0) {
isgo = false;
}
count = this.index;
ul_img.style.transform = "translate(" + -800 * this.index + "px)";
}
div_btn[b].onmouseout = function () {
showtime();
}
}
}
</script>
</head>
<body>
<div class="main_div">
<div class="arrows">
<span title="1" class="arrow"><</span>
<span title="0" class="arrow" style="float: right">></span>
</div>
<ul class="ul_img">
<li class="li_img"><img src="images/1.jpg"></li>
<li class="li_img"><img src="images/2.jpg"></li>
<li class="li_img"><img src="images/3.jpg"></li>
<li class="li_img"><img src="images/4.jpg"></li>
</ul>
</div>
<div style="margin-left: 600px">
<div class="div_btn"></div>
<div class="div_btn"></div>
<div class="div_btn"></div>
<div class="div_btn"></div>
</div>
</body>
</html>