一个简单轮播

2018-10-13  本文已影响0人  sxfshdf

1. 准备图片,最好是宽高一样的。设置图片的宽度

<!DOCTYPE html>
<html>
<head>
<script src="//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. 设置一个窗口;让图片横向显示;设置边框,然后观察

<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;/*交叉轴的起点对齐*/
  }
  .window{
    border: 3px solid green;
  }
</style>

图片超出了绿色边框的宽度,绿色边框的宽度是和页面宽度相同。

3. 设置窗口的宽高,和第一个图片宽高相同,然后设置 overflow: hidden ;

<style>
  .images{ 
    display: flex;
    align-items: flex-start;
  }
  .window{
    border: 3px solid green;
    width: 480px;
    height: 320px;
    overflow: hidden;
  }

此时显示的只有第一张图片,只需要改变images 的水平位置,就可以看到其他图片:

  <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 ,通过 js 控制使点击显示相应图片,初步实现轮播

<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张</button>
<button id="p2">第2张</button>
<button id="p3">第3张</button>
<button id="p4">第4张</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. 调整代码,可以支持更多张图片轮播

<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张</span>
    <span>第2张</span>
    <span>第3张</span>
    <span>第4张</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()可以得到当前元素在父元素下所有子元素中排在第几个,并返回这个值
    var n = index*-480
    $('#images').css({
      transform: 'translateX('+ n + 'px)'
    })
  })
}

6. 实现轮播自动播放

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()找出对应的dom,封装成对应的 jQuery;trigger用于触发事件
setInterval(()=>{
  a += 1
  allButtons.eq(a%size).trigger('click')
},1000) // 实现自动轮播

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) // 实现自动轮播;添加和删除class实现相应文字的高亮

8. 鼠标移入图片时自动轮播停止,移开时恢复自动轮播

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. 点击文字时文字高亮

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. 简化代码

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()
})
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