轮播图—纯js(javascript)实现：

作者: 东阳啊 | 来源:发表于2016-12-01 11:27 被阅读0次

纯js实现：

要求：算了，还是先看图吧

01.gif

实现效果：
图片自动轮播，鼠标移入停止，移出继续轮播
点击左右按钮实现切换
点击下标焦点实现切换

1、首先实现无缝滚动：
效果：

02.gif

原理：
让ul里的第一个 li 和最后一个 li 内容相同；
通过改变left值，让ul在box中移动；
当移动到最后一个的时候，在让ul回到其实位置；

屏幕快照 2016-11-30 下午4.49.26.png

代码实现：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>无缝滚动</title>
</head>
<style type="text/css">
    *{
        margin: 0;
        padding: 0;
    }
    .box{
        background: red;
        width: 600px;
        height: 300px;
        overflow: hidden;
        margin:100px auto;
        position: relative;
    }
    img{
        width: 600px;
        height: 300px;
        vertical-align: top;/*取消底边的3px */
    }
    ul{ 
        width: 500%;
        height: 300px;
        list-style: none;
        position: absolute;
        left: 0;
        top: 0;
    }
    li{
        float: left;
    }
</style>
<body>
    <div class="box" id="box">
        <ul id="inner-box">
            <li><img src="banner/banner1.jpg"></li>
            <li><img src="banner/banner2.jpg"></li>
            <li><img src="banner/banner3.jpg"></li>
            <li><img src="banner/banner4.jpg"></li>
            <li><img src="banner/banner1.jpg"></li>
        </ul>
     <ol class="">
        <li class="current">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ol>
    </div>
</body>
<script type="text/javascript">
     var oBox = document.getElementById("box");
     var oUl = document.getElementById("inner-box");
     var a = 0;          //定义一个变量用于设置left值
     var timer = null;   //定义一个计时器
     var target = 500;
     timer = setInterval(autoPlay,10);// 定义计时器每25毫秒执行一次
     function autoPlay() { //执行每次执行函数，left值减1
        a--;
        a <= -400 ? a = 0 :a;
        oUl.style.left = a+"%"; 
     }
     oBox.onmouseover = function () { //移出时清除计时器
         clearInterval(timer);
     }
     oBox.onmouseout=function(){ //移入时开始计时器
          timer = setInterval(autoPlay,10);
     }
</script>
</html>

2、加入缓冲的匀速运动：
原里：改变每次变化的速度

05.gif

代码实现

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>缓冲无缝滚动</title>
</head>
<style type="text/css">
* {
    margin: 0;
    padding: 0;
}
.box {
    background: red;
    width: 600px;
    height: 300px;
    overflow: hidden;
    margin: 100px auto;
    position: relative;
}

img {
    width: 600px;
    height: 300px;
    vertical-align: top;
    /*取消底边的3px */
}

ul {
    width: 500%;
    height: 300px;
    list-style: none;
    position: absolute;
    left: 0;
    top: 0;
}

li {
    float: left;
}
</style>

<body>
    <div class="box" id="box">
        <ul id="inner-box">
            <li><img src="banner/banner1.jpg"></li>
            <li><img src="banner/banner2.jpg"></li>
            <li><img src="banner/banner3.jpg"></li>
            <li><img src="banner/banner4.jpg"></li>
            <li><img src="banner/banner1.jpg"></li>
        </ul>

    </div>
</body>
<script type="text/javascript">
var oBox = document.getElementById("box");
var oUl = document.getElementById("inner-box");
var cur = 0; //定义一个变量用于设置left值
var timer = null; //定义一个计时器
var target = 0;
timer = setInterval(autoPlay, 2000); // 定义计时器每25毫秒执行一次

function autoPlay() { //执行每次执行函数，left值减1
    if (target <= -400) {
        cur = 0;
        target = -100;
    } else {
        target -= 100;
    }
    var timer1 = null;
    timer1 = setInterval(autoPlay, 30); //设置定时器每30毫秒执行一次
    function autoPlay() { 
        if (cur == target) {
            clearInterval(timer1) //大于目标值时，清空计时器
        } else {
            speed = (target - cur) / 7; //计算速度
            speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //取整
            cur = cur + speed; 
            oUl.style.left = cur + "%";

        }
    }
}
oBox.onmouseover = function() { //移出时清除计时器
    clearInterval(timer);
}
oBox.onmouseout = function() { //移入时开始计时器
    timer = setInterval(autoPlay, 2000);
}
</script>
</html>

3、添加左右点击按钮
效果：

03.gif

难点：

屏幕快照 2016-12-01 上午10.06.19.png

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>缓冲无缝滚动</title>
</head>
<style type="text/css">
* {
    margin: 0;
    padding: 0;
}

.box {
    background: red;
    width: 600px;
    height: 300px;
    overflow: hidden;
    margin: 100px auto;
    position: relative;
}

img {
    width: 600px;
    height: 300px;
    vertical-align: top;
    /*取消底边的3px */
}

ul {
    width: 500%;
    height: 300px;
    list-style: none;
    position: absolute;
    left: 0;
    top: 0;
}

li {
    float: left;
}
.btn span{
     width: 30px;
    height: 50px;
    background: #4a4a4a;
    display: inline-block;
    position: absolute;
    text-align: center;
    line-height: 50px;
    font-size: 24px;
    opacity: 0.4;
    cursor: pointer;
}
.btn span:hover{
    opacity: 1;
    color: #fff;
}

.btn .left{
    left: 0;
    top: 125px;
}

.btn .right{
    right: 0;
    top: 125px;
}


</style>

<body>
    <div class="box" id="box">
        <ul id="inner-box">
            <li><img src="banner/banner1.jpg"></li>
            <li><img src="banner/banner2.jpg"></li>
            <li><img src="banner/banner3.jpg"></li>
            <li><img src="banner/banner4.jpg"></li>
            <li><img src="banner/banner1.jpg"></li>
        </ul>
        <div class="btn">
            <span class="left" id="left"><</span>
            <span class="right" id="right">></span>
        </div>
    </div>
</body>
<script type="text/javascript">
var oBox = document.getElementById("box");
var oUl = document.getElementById("inner-box");
var oLeft = document.getElementById("left");
var oRight = document.getElementById("right");
var cur = 0; //定义一个变量用于设置left值
var timer = null; //定义一个计时器
var target = 0;
var timer1 = null;

timer = setInterval(autoPlay, 2000); // 定义计时器每25毫秒执行一次
function autoPlay() { //执行每次执行函数，left值减1
    if (target <= -400) {
        cur = 0;
        target = -100;
    } else {
        target -= 100;
    }
    sport(target);
}

oRight.onclick = function  (argument) {
    if (target <= -400) {
        cur = 0;
        target = -100;
    } else {
        target -= 100;
    }
     sport(target);
}   

oLeft.onclick = function  (argument) {
    if (target > -100) {
       cur -= 400;
       target = -300; 

    } else{
        target += 100;
    }
    sport(target);
}   



function sport(tar) {
    clearInterval(timer1);
    timer1 = setInterval(autoPlay, 30); //设置定时器每30毫秒执行一次
    function autoPlay() { 
        if (cur == tar) {
            clearInterval(timer1) //大于目标值时，清空计时器
        } else {
            speed = (tar - cur) / 7; //计算速度
            speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //取整
            cur = cur + speed; 
            oUl.style.left = cur + "%";
        }
    }
}
oBox.onmouseover = function() { //移出时清除计时器
    clearInterval(timer);
}
oBox.onmouseout = function() { //移入时开始计时器
    timer = setInterval(autoPlay, 2000);
}
</script>
</html>

4、添加底部焦点：

效果：在最上头；一开始的地方

01.gif

代码实现：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>标准轮播图</title>
</head>
<style type="text/css">
* {
    margin: 0;
    padding: 0;
}

.box {
    width: 600px;
    height: 300px;
    overflow: hidden;
    margin: 100px auto;
    position: relative;
}

img {
    width: 600px;
    height: 300px;
    vertical-align: top;
    /*取消底边的3px */
}

ul {
    width: 500%;
    height: 300px;
    list-style: none;
    position: absolute;
    left: 0;
    top: 0;
}

ul li {
    float: left;
}
.btn span{
     width: 30px;
    height: 50px;
    background: #4a4a4a;
    display: inline-block;
    position: absolute;
    text-align: center;
    line-height: 50px;
    font-size: 24px;
    opacity: 0.4;
    cursor: pointer;
}
.btn span:hover{
    opacity: 1;
    color: #fff;
}

.btn .left{
    left: 0;
    top: 125px;
}

.btn .right{
    right: 0;
    top: 125px;
}

ol{
    position: absolute;
    bottom: 20px;
    left: 40%;
    list-style: none;
}
ol li{
    width: 10px;
    height: 10px;
    border-radius: 10px;
    border: 1px solid #fff;
    float: left;
    margin: 0 4px;
}
</style>

<body>
    <div class="box" id="box">
        <ul id="inner-box">
            <li><img src="banner/banner1.jpg"></li>
            <li><img src="banner/banner2.jpg"></li>
            <li><img src="banner/banner3.jpg"></li>
            <li><img src="banner/banner4.jpg"></li>
            <li><img src="banner/banner1.jpg"></li>
        </ul>
        <ol id="ol">
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ol>
        <div class="btn">
            <span class="left" id="left"><</span>
            <span class="right" id="right">></span>
        </div>
    </div>
</body>
<script type="text/javascript">
var oBox = document.getElementById("box");
var oUl = document.getElementById("inner-box");
var oLeft = document.getElementById("left");
var oRight = document.getElementById("right");
var cur = 0; //定义一个变量用于设置left值
var timer = null; //定义一个计时器
var target = 0;
var timer1 = null;
var i = 0;
timer = setInterval(autoPlay, 2000); // 定义计时器每25毫秒执行一次
function autoPlay() { //执行每次执行函数，left值减1
    if (target <= -400) {
        cur = 0;
        target = -100;
    } else {
        target -= 100;
    }
    sport(target);

     
    btnBottom();
}

oRight.onclick = function  (argument) {
    if (target <= -400) {
        cur = 0;
        target = -100;
    } else {
        target -= 100;
    }
     sport(target); 
    btnBottom();
}   

oLeft.onclick = function  (argument) {
    if (target > -100) {
       cur -= 400;
       target = -300; 

    } else{
        target += 100;
    }
    sport(target);

    
    btnBottom();
}   

// 增加下标显示效果

btnBottom(i)

function  btnBottom() {
    i = -(target/100);
    i == 4 ? i = 0 : i; 
    var oOl = document.getElementById("ol");
    var oLi = oOl.getElementsByTagName("li");
    for( j=0 ; j<oLi.length ; j++){
      oLi[j].style.background = '';
    }
    oLi[i].style.background = '#fff';
}

// 加点击事件
var oOl = document.getElementById("ol");
var oLi = oOl.getElementsByTagName("li");
for( j=0 ; j<oLi.length ; j++){
    oLi[j].index = j
    oLi[j].onclick = function() {
           target = -(this.index*100);
           sport(target);
           btnBottom()
    }
}

function sport(tar) {
    clearInterval(timer1);
    timer1 = setInterval(autoPlay, 30); //设置定时器每30毫秒执行一次
    function autoPlay() { 
        if (cur == tar) {
            clearInterval(timer1) //大于目标值时，清空计时器
        } else {
            speed = (tar - cur) / 7; //计算速度
            speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //取整
            cur = cur + speed; 
            oUl.style.left = cur + "%";
        }
    }
}
oBox.onmouseover = function() { //移出时清除计时器
    clearInterval(timer);
}
oBox.onmouseout = function() { //移入时开始计时器
    timer = setInterval(autoPlay, 2000);
}
</script>
</html>

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轮播图—纯js(javascript)实现：

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