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轮播图的实现

轮播图的实现

作者: 缺志青年 | 来源:发表于2018-10-31 18:15 被阅读0次

    包含两个轮播图版本
    1.0 2.0
    1.0特点：
        1.简单，易理解
        2.可维护性差（添加图片后，要手动添加按钮span的数量，还要修改越界的代码
        3.可以在浏览界面进行切换速度快慢设置
        4.0可以选择按钮进行图片切换

    autoplay1.0.png

    2.0特点
        1.在1.0的基础上进行了部分代码调整
        2.可维护性提高，用户只需要添加图片，系统会自动生成按钮代码，修改越界代
        3.去除在界面浏览界面的切换速度设置
        4.添加了图片切换的动画效果
    系统的可维护性是衡量一个系统的可修复(恢复)性和可改进性的难易程度。

    autoplay2.0.png

    文档组织结构

    ├─css
  ├─index.css
├─img
├─js
  ├─autoplay.js
├─index.html
    轮播图1.0

    index.html

    <!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="css/index.css">
</head>
<body>
    <div class="container">
        <div class="banner" style="left: -600px">   <!--图片-->
            <img src="./img/5.jpg" alt="">
            <img src="./img/1.jpg" alt="">
            <img src="./img/2.jpg" alt="">
            <img src="./img/3.jpg" alt="">
            <img src="./img/4.jpg" alt="">
            <img src="./img/5.jpg" alt="">
            <img src="./img/1.jpg" alt="">
        </div>
        <div class="Buttons">              <!-- 按钮-->
            <span class="on">1</span>
            <span>2</span>
            <span>3</span>
            <span>4</span>
            <span>5</span>
        </div>
        <a href="javascript:;" class="l"><</a>  <!--左按钮-->
        <a href="javascript:;" class="r">></a>  <!--右按钮-->
    </div>
    <div class="control">
        <p>速度选择：
            <input type="text" maxlength="6" id="num">
            <input type="button" value="确定" onclick="speed()" class="mark">
        </p>

    </div>
</body>
<script type="text/javascript" src="js/autoplay.js"></script>
</html>

    index.css

    * {                         /*通用属性*/
     padding: 0px;
     margin: 0 auto;
     text-align: center;
    font-family: 宋体;
}
a {
    text-decoration: none; /*消除a标签的默认属性*/
}
.container {        /*相对布局，宽高为一张图片的大小*/
    margin-top: 150px;
    position: relative;
    height: 300px;
    width: 600px;
    border: 2px solid blue;
    overflow: hidden   /*只显示一张图片*/
}

.container .banner {    /*相对于.container绝对定位*/
    position: absolute;
    height: 300px;
    width: 4200px;
    z-index: 1;         /*设置为1好让.Buttons显示在图片上*/
}

.container .banner img {
    float: left;        /*图片左浮动，使其变为行类快类型*/
    height: 300px;
    width: 600px;
}

.container .Buttons {
    position: absolute;
    bottom: 10px;
    left: 400px;
    width: 200px;
    height: 40px;
    z-index: 2;
    cursor: pointer;    /*更改鼠标样式*/
}

.container .Buttons span {
    display: inline-block;
    height: 25px;
    width: 25px;
    font-size: 20px;
    line-height: 25px;
    border-radius: 50%;
    background: darkred;
}
.container .l {
    position: absolute;
    display: block;
    width: 40px;
    height: 60px;
    background: yellow;
    line-height: 60px;      /*将整个高度作为一行的高度*/
    font-size: 30px;        /*更改字体大小*/
    left: 0px;
    top: 120px;
}

.container .r {
    position: absolute;
    display: block;
    width: 40px;
    height: 60px;
    background: yellow;
    line-height: 60px;
    font-size: 30px;
    right: 0px;
    top: 120px;
}
.container:hover .l{
    z-index: 2;
}
.container:hover .r{
    z-index: 2;
}
.container .Buttons span.on {
    background: green;
}
.control {
    margin-top: 30px;
    height: 300px;
    width: 600px;

}
.control p {
    display: inline-block;
    float: left;
    line-height: 50px;
    text-align: left;
}
#num:hover {
    border-color: #cccccc;
}
.mark {
    border-color: #cccccc;
}

    autoplay.js

    var index = 0;
var container = document.querySelector(".container");
var banner = document.querySelector(".banner");
var prev = document.querySelector(".l");
var next = document.querySelector(".r");

//速度调整
function speed() {
    var num = document.getElementById('num');
    settimes = num.value;
    if (settimes <= 0)
    {
        alert("输入不合法！请保证数入的数值为正值！");
        settimes = 1000;
    }
    else
    {
        clearInterval(times);
        autoPlay();
    }
}
//上一张
prev.onclick = function () {
    prev_pic();
}
//下一张
next.onclick = function () {
    next_pic();
}
//上一张的函数
var prev_pic = function () {
    index --;
    if (index == -1)
        index = 4;
    var imgLeft = parseInt(banner.style.left) + 600;
    console.log(imgLeft);
    if (imgLeft == 0)
        imgLeft = -3000;
    banner.style.left = imgLeft + "px";
    BTtons();
}
//下一张的函数
var next_pic = function () {
    index ++;
    if (index == 5)
        index = 0;
    var imgLeft = parseInt(banner.style.left) - 600;
    if (imgLeft == -3600)
        imgLeft = -600;
    banner.style.left = imgLeft + "px";
    BTtons();
}

var times = null;       //自动切换事件
var settimes = 1000;    //自动切换的时间间隔
var autoPlay = function () {
    times = setInterval(function () {
        next_pic();
    },settimes);
}
autoPlay();

//鼠标移入
container.onmouseenter=function () {
    clearInterval(times);
}
//鼠标移出
container.onmouseleave = function () {
    autoPlay();
}
//按钮随图片切换
var Span = document.getElementsByTagName("span");
function BTtons() {
    for (let i = 0;i < Span.length;i ++)
    {
        Span[i].className = "";
    }
    Span[index].className = "on";
}

//对按钮进行监听
for (let i = 0;i < Span.length;i ++)
{
    Span[i].onclick = function () {
        index = i;
        var imgLeft = index * -600 - 600;
        banner.style.left = imgLeft + "px";
        BTtons();
    }
}
    轮播图2.0

    index.html代码

     <!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="css/index.css">
</head>
<body>
    <div class="container">
        <div class="wrap" style="left: -600px">
            <img src="./img/5.jpg" alt="" class="imgs">
            <img src="./img/1.jpg" alt="" class="imgs">
            <img src="./img/2.jpg" alt="" class="imgs">
            <img src="./img/3.jpg" alt="" class="imgs">
            <img src="./img/4.jpg" alt="" class="imgs">
            <img src="./img/5.jpg" alt="" class="imgs">
            <img src="./img/1.jpg" alt="" class="imgs">
        </div>
        <div id="buttons">
        </div>
        <a href="javascript:;" class="lbutton"><</a>
        <a href="javascript:;" class="rbutton">></a>
    </div>
</body>
<script type="text/javascript" src="js/autoplay.js"></script>
</html>

    index.css

    * {
    padding: 0px;
    font-family: 宋体;
    margin: 0 auto;
    text-align: center;
}
a {
    text-decoration: none;
}
.container {
    position: relative;
    width: 600px;
    height: 300px;
    top: 100px;
    overflow: hidden;
}
.wrap {
    position: absolute;
    height: 300px;
    z-index: 1;
}
.wrap img {
    float: left;
    width: 600px;
    height: 300px;
}
#buttons {
    position: absolute;
    height: 30px;
    right: 10px;
    bottom: 10px;
    z-index: 2;
    cursor: pointer;
}
#buttons span {
    display: inline-block;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: red;
    line-height: 30px;
    margin-left: 10px;
}
#buttons span.on {
    background: green;
}
#buttons span:hover {
    background: green;
}
.container .lbutton {
    position: absolute;
    display: block;
    height: 30px;
    width: 30px;
    line-height: 30px;
    top: 135px;
    left: 30px;
    background: rgba(40,41,41,0.75);
    color: red;
}
.container:hover .lbutton{
    z-index: 2;
}
.container .lbutton:hover {
    background: rgba(40,41,41,1);
}
.container .rbutton {
    position: absolute;
    display: block;
    height: 30px;
    width: 30px;
    line-height: 30px;
    top: 135px;
    right: 30px;
    background: rgba(40,41,41,0.75);
    color: red;
}
.container:hover .rbutton{
    z-index: 2;
}
.container .rbutton:hover {
    background: rgba(40,41,41,1);
}

    autoplay.js

    var container = document.querySelector(".container");
var wrap = document.querySelector(".wrap");
var buttons = document.getElementById("buttons");
var spans = document.getElementById("buttons").getElementsByTagName("span");
var prev = document.querySelector(".lbutton");
var next = document.querySelector(".rbutton");
var imgs = document.getElementsByClassName("imgs");

var index = 0;
var pic_time = 1000; //一张图片切换的时间


function create_Buttons() {
    let cssStr = `.wrap {width: ${imgs.length * 600 + "px"};}`+ `#buttons {width: ${(imgs.length - 1) * 40 + "px"};}`;  //动态添加.wrap #buttons 的宽度
    let styleNode = document.createElement('style');
    styleNode.innerText = cssStr;
    document.head.appendChild(styleNode);
    buttons.innerHTML += `<span class="on">`+1+`</span>`;
    for (let i = 2;i < imgs.length - 1;i ++)
    {
        buttons.innerHTML += `<span>`+i+`</span>`;
    }
}
create_Buttons();

function var_pic(offset) {
    var timer = 300;       //总位移时间
    var nums = 10;          //位移间隔时间
    var var_px = offset / (timer / nums);   //每次位移量
    var newleft = parseInt(wrap.style.left) + offset;
    function to_pic() {
        //动画效果开始
        if ((var_px <  0 && parseInt(wrap.style.left) > newleft)|| (var_px > 0 && parseInt(wrap.style.left) < newleft )){
            wrap.style.left = parseInt(wrap.style.left) + var_px + "px";
            setTimeout(to_pic,nums);    //调用自己nums次
        } else {
            //在第一张和最后一张完成到最后一张和第一张的跳转
            if (newleft > -600) {
                newleft = ((imgs.length-2) * -600);
            }else if (newleft < ((imgs.length-2) * -600)) {
                newleft = -600;
            }
            if (index === spans.length) {
                index = 0;
            }else if (index === -1) {
                index = spans.length - 1;
            }
            showbutton(index);
            wrap.style.left = newleft + "px";
        }
    }
    to_pic();
}
//下一张
next.onclick = function () {
    index ++;
    var_pic(-600);
}
//上一张
prev.onclick =function () {
    index --;
    var_pic(600);
}
//按钮颜色变化
function showbutton(index) {
    for (let i = 0;i < spans.length;i ++)
    {
        spans[i].className  = "";
    }
    spans[index].className = "on";
}
//一直保持监听状态，监听按钮是被点击
for (let i = 0;i< spans.length;i ++)
{
    spans[i].onclick= function () {
        index = i;
        wrap.style.left = i * -600  - 600 + "px";
        showbutton(i);
    }
}
//图片自动播放事件
var auto_pic = null;
function autoPlay() {
    auto_pic = setInterval(function () {
        index ++;
        var_pic(-600);
    },pic_time);
}

autoPlay();
//鼠标移入
container.onmouseenter = function () {
    clearInterval(auto_pic);
}
//鼠标移出
container.onmouseleave = function () {
    autoPlay();
}

    有些不足之处，还请不吝赐教。

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