JS+JQuery实现无缝连接轮播图

我之前写过一个简易版的自动+手动轮播图：简易轮播图
但是这个轮播图在切换的时候是没有实现无缝滚动的，每张图片都是单张切换的，而不是滑动。现在用JQuery实现无缝连接的轮播图。

无缝连接的轮播图的原理如下：

代码：

  
  


  * {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
  }

  #container {
    position: relative;
    
    width: 500px;
    height: 260px;
    margin: 20px auto;
    overflow: hidden;
    
  }

  #container .wrapper {
    position: absolute;
    top: 0;
    left: 0;
    
    width: 3000px;
    height: 100%;
  }

  #container .wrapper li {
    width: 500px;
    height: 100%;
    float: left;
  }

  #container .wrapper li img {
    width: 100%;
    height: 100%;
    vertical-align: middle;
    
  }

  #container .btnLeft,
  #container .btnRight {
    display: none;
    z-index: 999;
    width: 30px;
    height: 30px;
    position: absolute;
    top: 50%;
    margin-top: -15px;
    background-color: #9E9E9E;
    border-radius: 20%;
    opacity: 60%;
    font-size: 20px;
    color: #673ab7;
    text-align: center;
    line-height: 30px;
  }

  #container .btnLeft {
    left: 0;
  }

  #container .btnRight {
    right: 0;
  }

  #container .btnLeft:hover,
  #container .btnRight:hover {
    opacity: 70%;
    cursor: pointer;
  }

  
  #container:hover .btnLeft,
  #container:hover .btnRight {
    display: block;
  }

  
  #container .dots {
    background: rgba(0, 0, 0, .3);
    position: absolute;
    left: 50%;
    bottom: 10px;
    transform: translateX(-50%);
    z-index: 999;
    padding: 4px;
    border-radius: 24px;
  }

  #container .dots li {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: #9e9e9e;
    float: left;
    
    
    margin: 0 5px;
    cursor: pointer;
  }

  #container .dots li.active {
    background-color: #c74b42;
  }

  .clearfix::after {
    content: "";
    display: block;
    clear: both;
  }



  
  
    
    
      
      

      

      

      

      

      
      

    

    <
    >
    
    
      

 

 

 

 

 

      
    
  
  
  
  

这段代码用单例模式优化一下：

html部分：test.html

  
  


  * {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
  }

  #container {
    position: relative;
    
    width: 500px;
    height: 260px;
    margin: 20px auto;
    overflow: hidden;
    
  }

  #container .wrapper {
    position: absolute;
    top: 0;
    left: 0;
    
    width: 3000px;
    height: 100%;
  }

  #container .wrapper li {
    width: 500px;
    height: 100%;
    float: left;
  }

  #container .wrapper li img {
    width: 100%;
    height: 100%;
    vertical-align: middle;
    
  }

  #container .btnLeft,
  #container .btnRight {
    display: none;
    z-index: 999;
    width: 30px;
    height: 30px;
    position: absolute;
    top: 50%;
    margin-top: -15px;
    background-color: #9E9E9E;
    border-radius: 20%;
    opacity: 60%;
    font-size: 20px;
    color: #673ab7;
    text-align: center;
    line-height: 30px;
  }

  #container .btnLeft {
    left: 0;
  }

  #container .btnRight {
    right: 0;
  }

  #container .btnLeft:hover,
  #container .btnRight:hover {
    opacity: 70%;
    cursor: pointer;
  }

  
  #container:hover .btnLeft,
  #container:hover .btnRight {
    display: block;
  }

  
  #container .dots {
    background: rgba(0, 0, 0, .3);
    position: absolute;
    left: 50%;
    bottom: 10px;
    transform: translateX(-50%);
    z-index: 999;
    padding: 4px;
    border-radius: 24px;
  }

  #container .dots li {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: #9e9e9e;
    float: left;
    
    
    margin: 0 5px;
    cursor: pointer;
  }

  #container .dots li.active {
    background-color: #c74b42;
  }

  .clearfix::after {
    content: "";
    display: block;
    clear: both;
  }



  
  
    
    
      
      

      

      

      

      

      
      

    

    <
    >
    
    
      

 

 

 

 

 

      
    
  
  
  

JS部分：index.js

function debounce(func, wait, immediate) {
  let timer = null,
    result = null;
  return function anonymous(...args) {
    let context = this,
      now = immediate && !timer;
    clearTimeout(timer);
    timer = setTimeout(() => {
      timer = null;
      !immediate ? (result = func.call(context, ...args)) : null;
    }, wait);
    now ? (result = func.call(context, ...args)) : null;
    return result;
  };
}

let bannerModule = (function () {
  let $container = $("#container"),
    $wrapper = $container.children(".wrapper"),
    $btnLeft = $container.find(".btnLeft"),
    $btnRight = $container.find(".btnRight"),
    $dots = $container.find(".dots"),
    $dotList = $dots.find("li");

  let autoTimer = null,
    interval = 2000,
    imgIndex = 0; //当前轮播的图片索引，默认第一张
  // 自动轮播
  function autoPlay() {
    // 让wrapper向左移动
    imgIndex++;
    
    if (imgIndex > 5) {
      // 上次显示的是克隆的那张，忽略真实的第一张，让其立即跳转到第二张
      $wrapper.css("left", 0);
      imgIndex = 1;
    }

    // 匀速向左移动
    // 无动画版：$wrapper.css('transform', 'translate(' + (-imgIndex * 500) + 'px)');
    // 动画版：
    $wrapper.stop().animate({
      left: -imgIndex * 500 //JQ自动补'px'
    }, 300);

    showDots();
  }

  // 圆点对焦
  function showDots() {
    // 由于不能修改imgIndex的值，所以定义一个临时变量
    let temp = imgIndex;
    temp === 5 ? (temp = 0) : null;
    $dotList.each((index, item) => {
      let $item = $(item);
      if (index === temp) {
 $item.addClass("active");
 return;
      }
      $item.removeClass("active");
    });
  }

  //点击圆点
  function clickDots() {
    $dotList.click(debounce(function () {
      let index = $(this).index();
      imgIndex = index;

      $wrapper.stop().animate({
 left: -imgIndex * 500 //JQ自动补'px'
      }, 300);

      showDots();
    },300,true));
  }

  // 左右按键
  function btnClick() {
    $btnLeft.click(function () {
      imgIndex--;
      if (imgIndex < 0) {
 // 上次显示的是真实的第一张，忽略克隆的倒数第一张，让其立即跳转倒数第二张
 $wrapper.css('left', -2500);
 imgIndex = 4;
      }

      $wrapper.stop().animate({
 left: -imgIndex * 500 //JQ自动补'px'
      }, 300);

      showDots();
    });

    // 右键点击：相当于自动轮播
    $btnRight.click(debounce(autoPlay, 300, true));
  }

  return {
    init: function () {
      autoTimer = setInterval(autoPlay, interval);

      // 鼠标进入/离开轮播区域时停止/开启自动轮播
      $container.on("mouseenter", () => {
 clearInterval(autoTimer);
      });
      $container.on("mouseleave", () => {
 autoTimer = setInterval(autoPlay, interval);
      });

      clickDots();
      btnClick();
    },
  };
})();

bannerModule.init();

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。