原生js组件化开发简单轮播图实例代码
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内容图文
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.banner {
overflow: hidden;
position: relative;
}
ul,
ol,
li {
padding: 0;
margin: 0;
left: 0;
top: 0;
list-style: none;
}
.trans{
transition: all .3s ease;
}
.banner-wraper {
position: absolute;
left: 0;
top: 0;
}
.banner-wraper .banner-item {
float: left;
width: 900px;
height: 400px;
background: yellow;
}
.banner-wraper .banner-item:nth-child(3) {
background: blue;
}
.banner-wraper .banner-item:nth-child(2n) {
background: green;
}
.navigation {
position: absolute;
left: 50%;
transform: translateX(-50%);
top: 90%;
}
.nav-item {
width: 10px;
height: 10px;
background: #000;
display: inline-block;
margin: 0 5px;
}
.nav-item:hover {
cursor: pointer;
opacity: 0.4;
}
.navigation .active {
opacity: 0.4;
}
</style>
</head>
<body>
<p class="banner" id="swiper">
<ul class="banner-wraper trans">
<li class="banner-item"></li>
<li class="banner-item"></li>
<li class="banner-item"></li>
<li class="banner-item"></li>
<li class="banner-item"></li>
<li class="banner-item"></li>
</ul>
<ol class="navigation">
</ol>
</p>
<!-- <script src="./jquery.js"></script> -->
<script>
(function (win, doc) {
function Swiper(options) {
return new Swiper.prototype.init(options);
}
Swiper.prototype.init = function (options) {
// 初始化方法配置
this.options = options;
this.options.delay = options.delay || 4000;
this.options.autoPlay = options.autoPlay || false;
this.banner = doc.querySelector(this.options.el);
this.bannerWraper = this.banner.querySelector('.banner-wraper');
this.bannerItem = this.banner.querySelectorAll('.banner-item');
this.bannerW = this.bannerItem[0].offsetWidth;//轮播图宽度;
this.banner.style.width = this.bannerW + 'px';//根据item大小定义轮播图容器宽度
this.banner.style.minHeight = this.bannerItem[0].offsetHeight + 'px';//根据item大小定义轮播图容器高度
this.bannerWraper.style.width = this.bannerW * this.bannerItem.length + 'px';
this.bannerItem[0].className = 'banner-item active';
this.navigationItem = null;
// 定义当前页码索引
this.index = 0;
this.speed = null;
//定时器
this.timer = null;
this.init(this.options);
}
Swiper.fn = Swiper.prototype.init.prototype;
Swiper.fn.init = function () {
var speed = getComputedStyle(this.bannerWraper, false).transition;
speed = speed.split(' ')[1];
this.speed = (+speed.substring(0,speed.length-1)) * 1000;
// console.log(this.speed,'speed');
// 初始化功能函数
this.initNavigation();
this.changeActive();
// 鼠标移入清除自动播放
this.clearTimer();
if (this.options.loop) this.loop();
if (this.options.autoPlay) this.autoPlay();
}
//初始化分页按钮
Swiper.fn.initNavigation = function () {
var navigation = doc.querySelector('.navigation');
var navigationItem = '';
for (var i = 0, len = this.bannerItem.length; i < len; ++i) {
if (i === 0) {
navigationItem += '<p class="nav-item active"></p>';
} else {
navigationItem += '<p class="nav-item"></p>';
}
}
navigation.innerHTML = navigationItem;
this.navigationItem = doc.querySelectorAll('.nav-item');
}
Swiper.fn.changeActive = function () {
var _this = this;
for (var i = 0, len = _this.navigationItem.length; i < len; ++i) {
(function (i) {// 闭包保存i值
_this.navigationItem[i].onclick = function () {
_this.index = i;
_this.changeMain(this);
}
})(i);
}
}
Swiper.fn.changeMain = function (This) {
// console.log(this.index);
var _this = this;
if(this.options.loop && this.index == 0) {
this.index = this.navigationItem.length;
};
for (var j = 0, len = this.navigationItem.length; j < len; ++j) {
this.navigationItem[j].className = 'nav-item'
}
This.className = 'nav-item active';// 当前_this指向 li
this.bannerWraper.style.left = - this.bannerW * this.index + 'px';
// console.log(this.index,'this.index');
if(this.options.loop && this.index == this.navigationItem.length){
setTimeout(function(){
_this.bannerWraper.className = 'banner-wraper';
_this.bannerWraper.style.left = 0;
setTimeout(function(){
_this.bannerWraper.className = 'banner-wraper trans';
}, _this.speed/2);
}, _this.speed);
}
}
//自动播放
Swiper.fn.autoPlay = function () {
var _this = this;
var len = _this.navigationItem.length;
this.options.loop === true ? len : len = len - 1;
this.timer = setInterval(function () {
if (_this.index >= len) {
_this.index = 0;
} else {
_this.index++;
}
_this.changeMain(_this);
if(_this.options.loop && _this.index === len){
_this.index = 0;
_this.navigationItem[_this.index].className = 'nav-item active';
setTimeout(function(){
_this.bannerWraper.className = 'banner-wraper';
console.log(1)
_this.bannerWraper.style.left = 0;
setTimeout(function(){
console.log(2)
_this.bannerWraper.className = 'banner-wraper trans';
}, _this.speed/2);
}, _this.speed);
return;
}
_this.navigationItem[_this.index].className = 'nav-item active';
}, this.options.delay);
}
// 鼠标移入/移出 => 清除/重启定时器
Swiper.fn.clearTimer = function () {
var _this = this;
this.banner.onmouseover = function () {
clearInterval(_this.timer);
_this.timer = null;
}
this.banner.onmouseout = function () {
if (_this.options.autoPlay) _this.autoPlay();
}
}
Swiper.fn.loop = function() {
var htmlObjConvertStr = function(htmlObj){
var pContainer = document.createElement('p');
pContainer.appendChild(htmlObj);
return pContainer.innerHTML;
};
var _bannerHtml = this.bannerWraper.innerHTML;
this.bannerWraper.innerHTML = _bannerHtml + htmlObjConvertStr(this.bannerItem[0]);
this.bannerItem = this.banner.querySelectorAll('.banner-item');
this.bannerWraper.style.width = this.bannerW * this.bannerItem.length + 'px';// 修正banenrWraper宽度
this.bannerItem[this.bannerItem.length - 1].className = 'banner-item';// 修正末尾banner-item类名
}
Swiper.fn.constructor = Swiper;// 修正contructor指向
win.Swiper = Swiper;// 将swiper挂载到window对象
})(window, document);
Swiper({
el: '#swiper',
autoPlay: true, // 默认为false不自动播放
delay: 3000, // 默认为4s
loop: true
});
</script>
</body>
</html>
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