1. 準備圖片，最好是寬高一樣的。設置圖片的寬度
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<div class="images">
<img src="https://i.loli.net/2018/10/13/5bc1604f2a255.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f3b560.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f83051.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f836b9.jpg" width=480 alt="">
</div>
</body>
</html>
2. 設置一個窗口；讓圖片橫向顯示；設置邊框，然后觀察
<div class="window">
<div class="images">
<img src="https://i.loli.net/2018/10/13/5bc1604f2a255.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f3b560.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f836b9.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f83051.jpg" width=480 alt="">
</div>
</div>
<style>
.images{
display: flex;
align-items: flex-start;/*交叉軸的起點對齊*/
}
.window{
border: 3px solid green;
}
</style>
圖片超出了綠色邊框的寬度，綠色邊框的寬度是和頁面寬度相同。
3. 設置窗口的寬高，和第一個圖片寬高相同，然后設置 overflow: hidden ；
<style>
.images{
display: flex;
align-items: flex-start;
}
.window{
border: 3px solid green;
width: 480px;
height: 320px;
overflow: hidden;
}
此時顯示的只有第一張圖片，只需要改變images 的水平位置，就可以看到其他圖片：
<div class="window">
<div class="images" style="transform: translateX(-480px)">
<img src="https://i.loli.net/2018/10/13/5bc1604f2a255.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f3b560.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f836b9.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f83051.jpg" width=480 alt="">
</div>
</div>
4. 添加 button ，通過 js 控制使點擊顯示相應圖片，初步實現輪播
<div class="window">
<div class="images" id="images">
<img src="https://i.loli.net/2018/10/13/5bc1604f2a255.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f3b560.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f836b9.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f83051.jpg" width=480 alt="">
</div>
</div>
<button id="p1">第1張</button>
<button id="p2">第2張</button>
<button id="p3">第3張</button>
<button id="p4">第4張</button>
<style>
.images{
display: flex;
align-items: flex-start;
transition: transform 0.5s;
}
.window{
width: 480px;
height: 320px;
overflow: hidden;
}
</style>
$(p1).on('click',function(){
$(images).css({
transform: 'translateX(0)'})
})
$(p2).on('click',function(){
$(images).css({
transform: 'translateX(-480px)'
})
})
$(p3).on('click',function(){
$(images).css({
transform: 'translateX(-960px)'
})
})
$(p4).on('click',function(){
$(images).css({
transform: 'translateX(-1440px)'
})
})
5. 調整代碼，可以支持更多張圖片輪播
<div class="window">
<div class="images" id="images">
<img src="https://i.loli.net/2018/10/13/5bc1604f2a255.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f3b560.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f836b9.jpg" width=480 alt="">
<img src="https://i.loli.net/2018/10/13/5bc1604f83051.jpg" width=480 alt="">
</div>
</div>
<span id="buttons">
<span>第1張</span>
<span>第2張</span>
<span>第3張</span>
<span>第4張</span>
</span>
var allButtons = $('#buttons > span')
for( let i=0; i<allButtons.length; i++){
$(allButtons[i]).on('click',function(x){
var index = $(x.currentTarget).index()
//index()可以得到當前元素在父元素下所有子元素中排在第幾個，并返回這個值
var n = index*-480
$('#images').css({
transform: 'translateX('+ n + 'px)'
})
})
}
6. 實現輪播自動播放
var allButtons = $('#buttons > span')
for( let i=0; i<allButtons.length; i++){
$(allButtons[i]).on('click',function(x){
var index = $(x.currentTarget).index()
var n = index*-480
$('#images').css({
transform: 'translateX('+ n + 'px)'
})
})
}
var a = 0
var size = allButtons.length
allButtons.eq(a%size).trigger('click')
//eq()找出對應的dom，封裝成對應的 jQuery；trigger用于觸發事件
setInterval(()=>{
a += 1
allButtons.eq(a%size).trigger('click')
},1000) // 實現自動輪播
7. 文字高亮
.red{
color: red;
}
var a = 0
var size = allButtons.length
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
setInterval(()=>{
a += 1
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
},1000) // 實現自動輪播；添加和刪除class實現相應文字的高亮
8. 鼠標移入圖片時自動輪播停止，移開時恢復自動輪播
var a = 0
var size = allButtons.length
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
var timerId = setInterval(()=>{
a += 1
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
},1000)
$('.window').on('mouseenter',function(){
window.clearInterval(timerId)
})
$('.window').on('mouseleave',function(){
timerId = setInterval(()=>{
a += 1
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
},1000)
})
9. 點擊文字時文字高亮
var allButtons = $('#buttons > span')
for( let i=0; i<allButtons.length; i++){
$(allButtons[i]).on('click',function(x){
var index = $(x.currentTarget).index()
var n = index*-480
$('#images').css({
transform: 'translateX('+ n + 'px)'
})
a = index
allButtons.eq(a)
.addClass('red')
.siblings('.red').removeClass('red')
})
}
var a = 0
var size = allButtons.length
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
var timerId = setInterval(()=>{
a += 1
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
},3000)
$('.window').on('mouseenter',function(){
window.clearInterval(timerId)
})
$('.window').on('mouseleave',function(){
timerId = setInterval(()=>{
a += 1
allButtons.eq(a%size).trigger('click')
.addClass('red')
.siblings('.red').removeClass('red')
},3000)
})
10. 簡化代碼
var allButtons = $('#buttons > span')
for( let i=0; i<allButtons.length; i++){
$(allButtons[i]).on('click',function(x){
var index = $(x.currentTarget).index()
var n = index*-480
$('#images').css({
transform: 'translateX('+ n + 'px)'
})
a = index
activeButtons(allButtons.eq(a))
})
}
var a = 0
var size = allButtons.length
playSlide(a%size)
var timerId = setTimer()
function playSlide(index){
allButtons.eq(index).trigger('click')
}
function setTimer(){
return setInterval(()=>{
a += 1
playSlide(a%size)
},3000)
}
function activeButtons($buttons){
$buttons.addClass('red')
.siblings('.red').removeClass('red')
}
$('.window').on('mouseenter',function(){
window.clearInterval(timerId)
})
$('.window').on('mouseleave',function(){
timerId = setTimer()
})
