原生js實現移動端+pc端 輪播插件

slide.js

• 原生js寫的輪播兼容 pc+移動端 插件，支持輪播速度，輪播內容，輪播間隔，手勢靈敏度自定義，導航圓點點擊跳轉,手勢滑動。
• 使用說明：slide.js文件包含小部分es6語法編寫的文件，在移動端有兼容性問題，僅供於源碼參考。移動端跟pc端開發引用js文件直接下載slide-es5.js進行引入使用。

---

html代碼

<div id="slide" style="height:200px;width:300px;height:100px;border:1px solid #ccc">
    <div class="room">
        <img src="http://chenjianguang.com/static/callName/images/1.png" alt="" class="slide-item">
        <img src="http://chenjianguang.com/static/callName/images/2.png" alt="" class="slide-item">
        <img src="http://chenjianguang.com/static/callName/images/3.png" alt="" class="slide-item">
        <img src="http://chenjianguang.com/static/callName/images/4.png" alt="" class="slide-item">
        <img src="http://chenjianguang.com/static/callName/images/5.png" alt="" class="slide-item"> 
    </div>
</div>

---

1. 必須須要設置：包裹元素的id，以及高度跟寬度

2. 包裹元素下面須要跟隨一個div，div下面是帶有class屬性爲slide-item的任意元素

---

js代碼：

//須要先引入插件

<script src="./slid-es5.js"></script> 
   <script> slide = new Slide('slide',3000,1,20); </script>

//第一個參數是設置了輪播的包裹元素的id，是必須參數
//第二個參數是輪播間隔，非必須參數，默認爲3000ms
//第三個參數是輪播速度, 非必須參數，默認爲1，數值越大輪播速度越快
//第四個參數是手指滑動靈敏度，非必須參數，默認爲20，數值越大須要滑動觸發的距離就越大

這是上面代碼的slide Demo

---

廢話很少說，下面實現代碼跟註釋說明

(function () {
let Slide = function (
    slideId = 'slide',
    timeOut = 3000,
    speed = 0.1,
    d = 20
) {
    this.d = d;//滑動靈敏度
    this.timeOut = timeOut;//輪播間隔
    this.slide = document.querySelector('#slide'); //獲取視窗層
    this.room = this.slide.querySelector('div'); //獲取內容層
    this.imgs = [...this.slide.querySelectorAll('.slide-item')]; //輪播圖元素組
    this.slideWidth = parseInt(getComputedStyle(this.slide).width); //視窗層高度
    this.slideHeight = parseInt(getComputedStyle(this.slide).height); //視窗層寬度
    this.startPoint = null; //手指觸摸的起點
    this.navButtons = null; //獲取到全部的導航圓點
    this.timer = null; //定時器
    this.imgIndex = 1; //當前輪播圖片index
    this.prev = null; //上一個
    this.next = null; //下一個
    this.speed = -(this.slideWidth / 10 * speed); //動畫速度
    this.resetCss(); //初始化css樣式
    this.resetAll(); //初始化設置
    this.imgs.forEach((el) => {
        el.style.height = `${this.slideHeight}px`;
        el.style.width = `${this.slideWidth}px`;
    }); //使圖片的寬度跟視窗層同樣
    this.autoStart = setInterval(() => {
        this.nextItem()
    }, timeOut);
    //輪播間隔定時器

    for (let i = 0; i < this.navButtons.length; i++) {
        this.navButtons[i].onclick = this.navButtonClick.bind(this);
    } //綁定導航圓點點擊事件
    //綁定觸摸開始事件
    this.slide.addEventListener('touchstart', this.touchstart.bind(this));
    //綁定觸摸結束事件
    this.slide.addEventListener('touchend', this.touchend.bind(this));
}
//初始化樣式
Slide.prototype.resetCss = function () {
    let styleEle = document.createElement('style'); //建立style標籤
    let navLeft = this.slideWidth / 2 - this.imgs.length * 9;
    let navTop = this.slideHeight / 40;
    styleEle.innerHTML += '.slide{position:relative;overflow:hidden;font-size:0;}'; //溫馨化slide視窗的樣式
    styleEle.innerHTML += '.slide .room{position:absolute;}'; //初始化room內容層的樣式
    styleEle.innerHTML += '.slide .slide-item{display:inline-block;}'; //設置slide-item的樣式爲內聯塊級元素
    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); //插入標籤
}

Slide.prototype.resetAll = function () {
    this.slide.setAttribute('class', 'slide'); //給slide元素增長class屬性
    this.room.setAttribute('class', 'room'); //給room元素增長class屬性
    this.room.style.left = `0px`; //設置room的初始距離
    this.room.style.width = `${this.slideWidth * (this.imgs.length)}px`; //設置內容層的寬度
    //建立導航圓點定位框
    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'); //獲取全部的li節點
    this.navButtons[0].style.background = '#333'; //初始化第一個圓點的顏色
}
//切換下一個的函數
Slide.prototype.nextItem = function () {
    //清除過分定時器
    clearInterval(this.timer);
    //清除間隔播放定時器
    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);
}
//導航圓點點擊事件
Slide.prototype.navButtonStyle = function (target) {
    target.style.background = '#333';
    this.navButtons[this.imgIndex - 1].style.background = '#fff';
    this.imgIndex = target.index;
}
//手指觸摸起始觸發函數
Slide.prototype.touchstart = function (e = window.event) {
    this.startPoint = e.touches[0];
}
//手指觸摸結束觸發函數
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;
})();

使用說明以及源代碼後續的優化，歡迎關注個人github 插件地址 slide插件

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