原生js实现移动端+pc端 轮播插件

摘要：原生写的轮播兼容移动端插件，支持轮播速度，轮播内容，轮播间隔，手势灵敏度自定义，导航圆点点击跳转手势滑动。使用说明文件包含小部分语法编写的文件，在移动端有兼容性问题，仅供于源码参考。移动端跟端开发引用文件直接下载进行引入使用。

原生js写的轮播兼容 pc+移动端 插件，支持轮播速度，轮播内容，轮播间隔，手势灵敏度自定义，导航圆点点击跳转,手势滑动。

使用说明：slide.js文件包含小部分es6语法编写的文件，在移动端有兼容性问题，仅供于源码参考。移动端跟pc端开发引用js文件直接下载slide-es5.js进行引入使用。

html代码

必须需要设置：包裹元素的id，以及高度跟宽度

包裹元素下面需要跟随一个div，div下面是带有class属性为slide-item的任意元素

js代码：

//需要先引入插件

//第一个参数是设置了轮播的包裹元素的id，是必须参数
//第二个参数是轮播间隔，非必须参数，默认为3000ms
//第三个参数是轮播速度, 非必须参数，默认为1，数值越大轮播速度越快
//第四个参数是手指滑动灵敏度，非必须参数，默认为20，数值越大需要滑动触发的距离就越大

这是上面代码的slide Demo

废话不多说，下面实现代码跟注释说明

(function () {
let Slide = function (
    slideId = "slide",
    timeOut = 3000,
    speed = 0.1,
    d = 20
) {
    this.d = d;//滑动灵敏度
    this.timeOut = timeOut;//轮播间隔
    this.slide = document.querySelector("#slide"); //获取视窗层
    this.room = this.slide.querySelector("div"); //获取内容层
    this.imgs = [...this.slide.querySelectorAll(".slide-item")]; //轮播图元素组
    this.slideWidth = parseInt(getComputedStyle(this.slide).width); //视窗层高度
    this.slideHeight = parseInt(getComputedStyle(this.slide).height); //视窗层宽度
    this.startPoint = null; //手指触摸的起点
    this.navButtons = null; //获取到所有的导航圆点
    this.timer = null; //定时器
    this.imgIndex = 1; //当前轮播图片index
    this.prev = null; //上一个
    this.next = null; //下一个
    this.speed = -(this.slideWidth / 10 * speed); //动画速度
    this.resetCss(); //初始化css样式
    this.resetAll(); //初始化设置
    this.imgs.forEach((el) => {
        el.style.height = `${this.slideHeight}px`;
        el.style.width = `${this.slideWidth}px`;
    }); //使图片的宽度跟视窗层一样
    this.autoStart = setInterval(() => {
        this.nextItem()
    }, timeOut);
    //轮播间隔定时器

    for (let i = 0; i < this.navButtons.length; i++) {
        this.navButtons[i].onclick = this.navButtonClick.bind(this);
    } //绑定导航圆点点击事件
    //绑定触摸开始事件
    this.slide.addEventListener("touchstart", this.touchstart.bind(this));
    //绑定触摸结束事件
    this.slide.addEventListener("touchend", this.touchend.bind(this));
}
//初始化样式
Slide.prototype.resetCss = function () {
    let styleEle = document.createElement("style"); //创建style标签
    let navLeft = this.slideWidth / 2 - this.imgs.length * 9;
    let navTop = this.slideHeight / 40;
    styleEle.innerHTML += ".slide{position:relative;overflow:hidden;font-size:0;}"; //舒适化slide视窗的样式
    styleEle.innerHTML += ".slide .room{position:absolute;}"; //初始化room内容层的样式
    styleEle.innerHTML += ".slide .slide-item{display:inline-block;}"; //设置slide-item的样式为内联块级元素
    styleEle.innerHTML += `.slide .nav{padding:0 4px;list-style:none;position:absolute;font-size:0px;bottom:${navTop}px;left:${navLeft}px;text-align:center;}`;
    styleEle.innerHTML += ".navButton{display:inline-block;margin:6px 4px;background:#fff;width:8px;height:8px;-moz-border-radius:8px;border-radius:8px;cursor:pointer;box-shadow:0 0 6px #bbb;}";
    document.head.appendChild(styleEle); //插入标签
}

Slide.prototype.resetAll = function () {
    this.slide.setAttribute("class", "slide"); //给slide元素增加class属性
    this.room.setAttribute("class", "room"); //给room元素增加class属性
    this.room.style.left = `0px`; //设置room的初始距离
    this.room.style.width = `${this.slideWidth * (this.imgs.length)}px`; //设置内容层的宽度
    //创建导航圆点定位框
    let nav = document.createElement("ul");
    nav.id = "nav";
    nav.setAttribute("class", "nav");
    this.slide.appendChild(nav);

    for (let i = 0; i < this.imgs.length; i++) {
        let navButtonLi = document.createElement("li");
        navButtonLi.setAttribute("class", "navButton");
        navButtonLi.index = i + 1;
        nav.appendChild(navButtonLi);
    }
    this.navButtons = this.slide.querySelectorAll("li"); //获取所有的li节点
    this.navButtons[0].style.background = "#333"; //初始化第一个圆点的颜色
}
//切换下一个的函数
Slide.prototype.nextItem = function () {
    //清除过度定时器
    clearInterval(this.timer);
    //清除间隔播放定时器
    clearInterval(this.autoStart);
    this.timer = setInterval(() => {
        let left = parseInt(this.room.style.left);
        if (this.imgIndex < this.imgs.length) {
            if (left > (-this.slideWidth * this.imgIndex)) {
                this.room.style.left = `${parseInt(this.room.style.left)+this.speed}px`;
            } else {
                clearInterval(this.timer);
                this.room.style.left = `${-this.slideWidth*this.imgIndex}px`;
                this.navButtons[this.imgIndex - 1].style.background = "#fff";
                this.imgIndex++;
                this.navButtons[this.imgIndex - 1].style.background = "#333";
            }
        } else {
            if (left < 0) {
                this.room.style.left = `${parseInt(this.room.style.left)+(-this.speed*2)}px`;
            } else {
                clearInterval(this.timer);
                this.room.left = "0";
                this.navButtons[this.imgIndex - 1].style.background = "#fff";
                this.imgIndex = 1;
                this.navButtons[this.imgIndex - 1].style.background = "#333";
            }
        }
    }, 16.7);
    this.autoStart = setInterval(() => {
        this.nextItem()
    }, this.timeOut);
}

Slide.prototype.lastItem = function () {
    clearInterval(this.timer);
    clearInterval(this.autoStart);
    this.timer = setInterval(() => {
        let left = parseInt(this.room.style.left);
        if (this.imgIndex > 1) {
            if (left < (-this.slideWidth * (this.imgIndex - 2))) {
                this.room.style.left = `${parseInt(this.room.style.left)-this.speed}px`;
            } else {
                clearInterval(this.timer);
                this.room.style.left = `${-this.slideWidth*(this.imgIndex-2)}px`;
                this.navButtons[this.imgIndex - 1].style.background = "#fff";
                this.imgIndex--;
                this.navButtons[this.imgIndex - 1].style.background = "#333";
            }
        } else {
            if (left > -this.slideWidth * (this.imgs.length - 1)) {
                this.room.style.left = `${parseInt(this.room.style.left)+(this.speed*2)}px`;
            } else {
                clearInterval(this.timer);
                this.room.left = `${-this.slideWidth*this.imgs.length-1}px`;
                this.navButtons[this.imgIndex - 1].style.background = "#fff";
                this.imgIndex = this.imgs.length;
                this.navButtons[this.imgIndex - 1].style.background = "#333";
            }
        }
    }, 16.7);
    this.autoStart = setInterval(() => {
        this.nextItem()
    }, this.timeOut);
}
Slide.prototype.navButtonClick = function ({
    target
}) {
    clearInterval(this.autoStart);
    clearInterval(this.timer);
    this.timer = setInterval(() => {
        let left = parseInt(this.room.style.left);
        if (target.index > this.imgIndex) {
            if (left > -this.slideWidth * (target.index - 1)) {
                this.room.style.left = `${parseInt(this.room.style.left)+this.speed*(target.index-this.imgIndex)}px`;

            } else {
                clearInterval(this.timer);
                this.room.style.left = `${-(this.slideWidth)*(target.index-1)}px`;
                this.navButtonStyle(target);
            }
        } else if (target.index < this.imgIndex) {
            if (left < -this.slideWidth * (target.index - 1)) {
                this.room.style.left = `${parseInt(this.room.style.left) - this.speed * (this.imgIndex - target.index)}px`;
            } else {
                clearInterval(this.timer);
                this.room.style.left = `${(-this.slideWidth) * (target.index - 1)}px`;
                this.navButtonStyle(target);

            }
        } else {
            return false;
        }
    }, 16.7);
    this.autoStart = setInterval(() => {
        this.nextItem()
    }, this.timeOut);
}
//导航圆点点击事件
Slide.prototype.navButtonStyle = function (target) {
    target.style.background = "#333";
    this.navButtons[this.imgIndex - 1].style.background = "#fff";
    this.imgIndex = target.index;
}
//手指触摸起始触发函数
Slide.prototype.touchstart = function (e = window.event) {
    this.startPoint = e.touches[0];
}
//手指触摸结束触发函数
Slide.prototype.touchend = function (e = window.event) {
    let endPoint = e.changedTouches[0];
    let x = endPoint.clientX - this.startPoint.clientX;
    let y = endPoint.clientY - this.startPoint.clientY;
    if (Math.abs(x) > this.d) {
        if (x < 0) {
            this.nextItem();
        } else {
            this.lastItem();
        }
    }
}
this.Slide = Slide;
})();

使用说明以及源代码后续的优化，欢迎关注我的github 插件地址slide插件

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