纯js普通轮播图卡片式轮播图堆叠式轮播图

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记录一下做轮播图插件的过程 …

效果图

普通轮播图

卡片式轮播图

堆叠式轮播图

普通轮播图

功能:

* 可控制是否自动轮播
* 左右箭头切换上一张,下一张,节流处理
* 鼠标放到箭头上,图片停止自动轮播,鼠标移开接着继续播放
* 点击小圆点可跳转到对应顺序的图片
* 移动端可左滑、右滑切换

普通轮播图 - 演示

普通轮播图 - 源码

思路:

如上图所示,假设有三张图片进行轮播,绿色区域是显示区域,其它部分都是隐藏的

  • 页面渲染时, 会多选择两张图片,图中数字 1,2,3 分别表示第几张图片,A,B,C,D 分别代表不同时间的图片列表 div 的状态
  • A 矩形框为页面启动时的效果,展示第一张图片
  • B 为下一张的效果图,展示第二张图片
  • 一直下一张直到展示第一张时,如 C 中所示,这时已经是当前图片列表的最后一张了,所以要将 C 的状态变为 D 的状态,展示的还是第一张图片,相当于只是悄悄把图片列表 div 的 left 值变化了,展示的图片并没有变还是第一张图片
  • 上一张也是相同的思路

页面布局

  • class=”swiper-list” 这个 div 为视口 div, 大小和图片的大小相同,其余部分隐藏
  • class=”swiper-main” 这个 div 为图片列表 div,通过不断变化 left 值来切换上一张图片和下一张图片
  • 切换下一张图片时,图片列表 div 的 left 值在原有的基础上减去一个图片的宽度
  • 切换上一张图片时,图片列表 div 的 left 值在原有的基础上加去一个图片的宽度

源码

上一张,下一张核心方法

nowIndex 用来标记当前展示的是第几张图片,初始值为 0

// 上一张
prevSlider(aniTIme) {
    let that = this;
    if (this.imgArr.length===1) return;
    this.mainDom.style.transition = `left ${aniTIme / 1000}s`
    this.mainDom.style.left = `${parseInt(this.mainDom.style.left) + this.moveWidth}px`; // 图片列表 div 的 left 值变化
    if (this.nowIndex === 0) {that.nowIndex = (that.imgArr.length-1);
        that.setActiveSpot();
        setTimeout(function() {                    
            that.mainDom.style.transitionProperty = 'none'; // 悄悄换 left 值时,要设置这个属性,不然会播放动画
            that.mainDom.style.left = `${-that.imgArr.length * that.moveWidth}px`;
        }, aniTIme) // 当前展示第一张,上一张再没有了,悄悄把图片列表页 left 值变化,展示的图片还是第一张图片
    } else {
        this.nowIndex--;
        this.setActiveSpot();}
},
// 下一张
nextSlider(aniTIme) {
    let that = this;
    if (this.imgArr.length===1) return;
    this.nowIndex++;
    this.mainDom.style.transition = `left ${aniTIme / 1000}s`
    this.mainDom.style.left = `${parseInt(this.mainDom.style.left) - this.moveWidth}px`;
    if (this.nowIndex === (this.imgArr.length)) {
        that.nowIndex = 0;
        that.setActiveSpot();
        setTimeout(function() {
            that.mainDom.style.transitionProperty = 'none';
            that.mainDom.style.left = `${-that.moveWidth}px`;
        }, aniTIme) // 当前展示最后一张,下一张再没有了,悄悄把图片列表 div 的 left 值变化,展示的图片还是最后一张图片
    } else {this.setActiveSpot();
    }
},
// 设置原点样式
setActiveSpot: function() {for (let i = 0; i < this.swiperSpotDom.childElementCount; i++) {if (i === Math.abs(this.nowIndex)) {document.getElementsByClassName('spot-item')[i].style.backgroundColor = '#ff5c1f'
        } else {document.getElementsByClassName('spot-item')[i].style.backgroundColor = '#ccc'
        }
    }
},                              

下一张按钮事件绑定,节流处理

eventBind() {
    ...
    
    // 下一张按钮事件绑定
    this.rightBtn.addEventListener('mouseover', function() {clearInterval(that.timer);
    })
    this.rightBtn.addEventListener('mouseout', function() {that.timer = setInterval(that.nextSlider.bind(that, that.aniTIme), that.intervalTime);
    })
    this.rightBtn.addEventListener('click', function() {that.throttle(that.nextSlider, 300, 300);
    })
    
    ...
}

    
// 节流:时间戳版
throttle(handle, delay, val) {var now = Date.now();
    if (now - this.prev >= delay) {handle.call(this, val);
        this.prev = Date.now();}
},

节流:使事件均匀间隔时间触发

这里的节流和其他的节流写的有点不一样,可以根据自己的来

小圆点点击事件绑定

eventBind() {
    ...
    
    // 小圆点事件绑定
    this.swiperSpotDom.addEventListener('mouseover', function() {clearInterval(that.timer);
    })
    this.swiperSpotDom.addEventListener('mouseout', function() {that.timer = setInterval(that.nextSlider.bind(that, that.aniTIme), that.intervalTime);
    })
    this.swiperSpotDom.addEventListener('click', function(e) {
        e = e || window.event; // 这一行及下一行是为兼容 IE8 及以下版本
      var target = e.target || e.srcElement;
      if (target.tagName.toLowerCase() === "li") {var ret = this.querySelectorAll("li");
        let index = Array.prototype.indexOf.call(ret, target);
            that.nowIndex = index;
            that.setActiveSpot();
            that.mainDom.style.transition = `left .8s`
            that.mainDom.style.left = `${-(that.nowIndex+1) * that.moveWidth}px`;
      }
    })
    
    ...
}

判断点击的是哪一个 li, 并把下标值赋给 nowIndex,图片列表 div(mainDom)的 left 值变化,更新原点的样式

移动端左右滑动事件

eventBind() {
    ...
    
    this.mainDom.addEventListener('touchstart', function(e) {clearInterval(that.timer);
        that.startX = e.changedTouches[0].clientX;
        that.startY = e.changedTouches[0].clientY;
    })
    this.mainDom.addEventListener('touchmove', function(e) {clearInterval(that.timer);
        that.endX = e.changedTouches[0].clientX;
        that.endY = e.changedTouches[0].clientY;
    })
    this.mainDom.addEventListener('touchend', function(e) {if (!that.mainDom.style.transition) {that.mainDom.style.transition = `left ${that.aniTIme / 1000}s`
        }
        let angle = that.angle({X: that.startX, Y: that.startY}, {X: that.endX, Y: that.endY});
        if (Math.abs(angle) > 30) return;
        if (that.endX > that.startX){ // 右滑
            that.prevSlider();} else { // 左滑
            that.nextSlider();}
        that.timer = setInterval(that.nextSlider.bind(that, that.aniTIme), that.intervalTime);
        
    })
    
    ...
},/**
* 计算滑动角度
* @param {Object} start 起点坐标
* @param {Object} end 终点坐标
*/
angle: function (start, end) {
    let _X = end.X - start.X;
    let _Y = end.Y - start.Y;
    // 返回角度 /Math.atan()返回数字的反正切值
    return 360 * Math.atan(_Y / _X) / (2 * Math.PI);
}

左滑调用 nextSlider(),右滑调用 prevSlider()

使用:

引入 slider.js

    <div class="swiper-list"></div>
let imgArr = [
    {
        url: '#',
        imgPath: '../i.jpg'
    },
    {
        url: '#',
        imgPath: '../o.jpg'
    },
    {
        url: '#',
        imgPath: '../q.jpeg'
    },
    {
        url: '#',
        imgPath: '../w.jpg'
    },
    {
        url: '#',
        imgPath: '../z.png'
    }
];
// let imgArr = ['i.jpg', 'o.jpg', 'q.jpeg'];
// let imgArr = ['i.jpg', 'o.jpg'];
// let imgArr = ['i.jpg'];
new Swiper({
    imgArr: imgArr, // 图片数组
    aniTIme: 1000, // 动画执行的时间
    intervalTime: 1000, // 图片停留的时间
    autoplay: true // 是否自动播放
}).init();

css

<style>
    ul{padding: 0; list-style: none;}
    .swiper-list{
        width: 640px;
        height: 360px;
        margin: 0 auto;
        position: relative;
        overflow: hidden;
    }
    .swiper-main {
        height: 100%;
        position: relative;
        overflow: hidden;
    }
    .swiper-item{
        height: 100%;
        display: inline;
        position: absolute;
    }
    img {
        width: 100%;
        height: 100%;
        display: block;
    }

    .swiper-spot{
        width: 100%;
        height: 15px;
        display: flex;
        justify-content: center;
        align-items: center;
        position: absolute;
        bottom: 10px;
    }
    .swiper-spot .spot-item{
        width: 15px;
        height: 15px;
        border-radius: 50%;
        background-color: #ccc;
        margin-left: 10px;
    }
    .swiper-spot .spot-item:nth-of-type(1) {margin-left: 0;}

    .leftBtn{
        position: absolute;
        left: 15px;
        top: 50%;
        transform: translateY(-50%);
        width: 30px;
        height: 30px;
    }
    .rightBtn{
        position: absolute;
        right: 15px;
        top: 50%;
        transform: translateY(-50%);
        width: 30px;
        height: 30px;
    }
</style>

卡片式轮播

功能:

* 可控制是否自动轮播
* 左右箭头切换上一张,下一张,节流处理
* 鼠标放到箭头上,图片停止自动轮播,鼠标移开接着继续播放
* 移动端可左滑、右滑切换

卡片式轮播 - 演示

卡片式轮播 - 源码

思路:

与普通轮播图思路相同,不过这个头和末尾分别加了两张图片用来过渡,也是图片移动到临界值时,图片列表 div 的 left 值改变,展示的是同一张图片,但是图片列表 div 的 left 值不同

代码

这里的 nowIndex 默认值为 3,由于头追加了两张图片,要使下标为 3 的元素是中间的图片,并且没有进行缩放,其余图片是缩小的

/**
* obj: 
* imgArr 图片数组
* imgWidth 图片宽度
* aniTime 动画切换时间
* intervalTime 停留的时间
* scale 图片缩放
* autoplay 是否自动播放
* gap 图片之间间隔
*/
function Swiper(obj) {this.imgArr = obj.imgArr || [];
    this.scale = obj.scale || 0.8; // 图片缩放值
    this.gap = obj.gap; // 图片未缩放状态下图片之间的间隔

    // 移动端
    if ((navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i))) {this.containerWidth = document.body.clientWidth; // 轮播图盒子宽度}else{
        // PC 端
       this.containerWidth = 600; // 轮播图盒子宽度
    }
    this.imgWidth = obj.imgWidth; // 图片宽度
    this.aniTime = obj.aniTime || 500;
    this.intervalTime = this.aniTime + obj.intervalTime || 2000;
    this.nowIndex = 3;
    this.imgDoms = document.getElementsByClassName('swiper-slide');
    this.mainDom = document.getElementsByClassName('swiper-main')[0];
    this.listDoms = document.getElementsByClassName('swiper-list')[0];
    this.activeDom = this.imgDoms[0];
    this.autoplay = obj.autoplay;

    this.listDoms.style.width = `${this.containerWidth}px`;

    this.timer; // 自动播放的定时器
    this.prev = Date.now();

    this.diffLen = (this.containerWidth - this.imgWidth - (this.gap * 2)) / 2;
      this.clsSuffix = obj.clsSuffix; // 类名后缀
}

diffLen 值:

prevSlider: function(aniTime) {if (this.imgArr.length ===2) {
        this.nowIndex = this.nowIndex ? 0 : 1;
        this.setScale()} else if (this.imgArr.length ===1) {return;} else {
        this.nowIndex--;
        this.mainDom.style.transition = `left ${aniTime/1000}s`
        this.mainDom.style.left = `${parseInt(this.mainDom.style.left)+(this.gap + this.imgWidth)}px`;
        if (this.nowIndex === 1) {this.setScale()
            setTimeout(function() {this.nowIndex = (this.imgArr.length+1);
                this.setScale()
                this.mainDom.style.transitionProperty = 'none';
                this.mainDom.style.left = `${-(parseInt(this.imgDoms[this.nowIndex].style.left) - this.diffLen - this.gap)}px`;
            }.bind(this), aniTime)
        } else {this.setScale()
        }
    }
},
nextSlider: function(aniTime) {if (this.imgArr.length ===2) {
        this.nowIndex = this.nowIndex ? 0 : 1;
        this.setScale()} else if (this.imgArr.length ===1) {return;} else {if (this.nowIndex >=2) {this.mainDom.style.transition = `left ${aniTime/1000}s`
            this.mainDom.style.left = `${parseInt(this.mainDom.style.left)-(this.gap + this.imgWidth)}px`;
            // this.mainDom.style.left = `${this.gap + this.imgWidth}px`;
        }
        if (this.nowIndex === (this.imgArr.length+1)) {this.nowIndex = (this.imgArr.length+2);
            this.setScale()
            setTimeout(function() {
                this.nowIndex = 2;
                this.setScale()
                this.mainDom.style.transitionProperty = 'none';
                this.mainDom.style.left = `${-(this.imgWidth - this.diffLen)}px`;
            }.bind(this), aniTime)
        } else {
            this.nowIndex++;
            this.setScale()}
    }
},
setScale: function() {
    // 堆叠式
    if (this.gap < 0) {for (let i = 0; i < this.imgDoms.length; i++) {if (this.imgArr.length ===2) {this.imgDoms[0].style.left = `${(this.containerWidth/4) - (this.imgWidth/2)}px`;
                this.imgDoms[1].style.left = `${(this.containerWidth/4)*3 - (this.imgWidth/2)}px`;
            } else if (this.imgArr.length ===1) {this.imgDoms[i].style.left = `${(this.containerWidth/2) - (this.imgWidth/2)}px`;
            } else {this.imgDoms[i].style.left = `${(i - 1) * (this.imgWidth + this.gap)}px`;
            }


            if (i === this.nowIndex) {this.imgDoms[i].style.transform = 'scale(1)';
                this.imgDoms[i].style.zIndex = '1001';
            } else if (i < this.nowIndex) {this.imgDoms[i].style.transform = `scale(${1 - ((this.nowIndex - i) * 0.2)})`;
                this.imgDoms[i].style.zIndex = 1000 - ((this.nowIndex - i));
            } else if (i > this.nowIndex) {this.imgDoms[i].style.transform = `scale(${1 - ((i - this.nowIndex) * 0.2)})`;
                this.imgDoms[i].style.zIndex = 1000 - (i - this.nowIndex);
            }
        }
    } else {
    // 卡片式
        for (let i = 0; i < this.imgDoms.length; i++) {if (this.imgArr.length ===2) {this.imgDoms[0].style.left = `${(this.containerWidth/4) - (this.imgWidth/2)}px`;
                this.imgDoms[1].style.left = `${(this.containerWidth/4)*3 - (this.imgWidth/2)}px`;
            } else if (this.imgArr.length ===1) {this.imgDoms[i].style.left = `${(this.containerWidth/2) - (this.imgWidth/2)}px`;
            } else {this.imgDoms[i].style.left = `${(i - 1) * (this.imgWidth + this.gap)}px`;
            }
            if (i === this.nowIndex) {this.imgDoms[i].style.transform = 'scale(1)';
            } else {this.imgDoms[i].style.transform = `scale(${this.scale})`;
            }
        }
    }
},

用法

<div class="swiper-list-card swiper-list">    
    <div class="swiper-main-card swiper-main"></div>
    <img id="prev-card" class="btn leftBtn" src="../left.png" alt="">
    <img id="next-card" class="btn rightBtn" src="../right.png" alt="">
</div>
// 引入 slider_card.js
<script src="./slider_card.js"></script>
let imgArr = [{
        url: '#',
        imgPath: '../i.jpg'
    },
    {
        url: '#',
        imgPath: '../o.jpg'
    },
    {
        url: '#',
        imgPath: '../q.jpeg'
    },
    {
        url: '#',
        imgPath: '../w.jpg'
    },
    {
        url: '#',
        imgPath: '../z.png'
    }
];
// let imgArr = ['i.jpg', 'o.jpg', 'q.jpeg'];
// let imgArr = ['i.jpg', 'o.jpg'];
// let imgArr = ['i.jpg'];
new Swiper({
    imgArr: imgArr,  // 图片数组
    imgWidth: 200, // 图片宽度
    aniTime: 1000,  // 动画切换时间
    intervalTime: 1500, // 停留的时间
    scale: 0.8,  // 图片缩放
    autoplay: true, // 是否自动播放
    gap: 0, // 图片之间间隔
    clsSuffix: '-card' // 元素类名后缀
}).init();

css

<style>
    .swiper-list{
        height: 200px;
        position: relative;
        overflow: hidden;
        border: 1px solid #eee;
        padding: 30px 0;
    }
    .swiper-main{
        height: 100%;
        position: relative;
    }
    .swiper-main img{
        height: 100%;
        display: block;
        position: absolute;
        top: 0px;
        border-radius: 4px;
        display: inline-block;
        box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    }
    .btn{
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        width: 30px;
        height: 30px;
        z-index: 1002;
    }
    .leftBtn{left: 0px;}
    .rightBtn{right: 0px;}
</style>

堆叠式轮播

堆叠式轮播与卡片式轮播原理相同,只是图片间距 gap 设置负值就好,用法同卡片式轮播一样

演示
源码

<div class="swiper-list-stack swiper-list">    
    <div class="swiper-main-stack swiper-main"></div>
    <img id="prev-stack" class="btn leftBtn" src="../left.png" alt="">
    <img id="next-stack" class="btn rightBtn" src="../right.png" alt="">
</div>
// 引入 slider_card.js
<script src="./slider_card.js"></script>
new Swiper({
    imgArr: imgArr, 
    imgWidth: 320, 
    aniTime: 1000, 
    intervalTime: 1500, 
    scale: 0.8, 
    autoplay: false,
    gap: -200,
      clsSuffix: '-stack'
}).init();

加 clsSuffix 的原因是:页面获取元素是用类名来获取的,加一个后缀来区分卡片式轮播图和堆叠式轮播

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