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原生js轮播（仿慕课网）

2017-02-15 10:33 351 查看

效果如下：

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>javascript</title>
<style>
*{margin:0;padding:0;border:0;}
a{text-decoration:none;color:#fff;font-size:40px;line-height:200px;display:none;text-align:center;}
#container{width:300px;height:200px;margin:50px auto;position:relative;overflow:hidden;}
#list{width:2100px;height:200px;position:absolute;top:0;}
#list span{width:300px;height:200px;display:inline-block;text-align:center;font-size:22px;float:left;color:#fff;}
.one{background:red;}
.two{background:orange;}
.three{background:blue;}
.four{background:green;}
.five{background:black;}
#buttons{width:200px;height:30px;position:absolute;bottom:0px;left:100px;z-index:9;}
#buttons span{display:inline-block;cursor:pointer;width:12px;height:12px;border-radius:6px;background: #2a2a2a}
#prev{width:40px;height:200px;position:absolute;left:0px;}
#next{width:40px;height:200px;position:absolute;right:0px;}
#container .on{background:#fff;}
</style>
</head>
<body>
<div id="container">
<div id="list" style="left:-300px">
<span class="five">我是黑色第五张</span>
<span class="one">我是红色第一张</span>
<span class="two">我是黄色第二张</span>
<span class="three">我是蓝色第三张</span>
<span class="four">我是绿色第四张</span>
<span class="five">我是黑色第五张</span>
<span class="one">我是红色第一张</span>
</div>
<div id="buttons">
<span class="on" index="1"></span>
<span index="2"></span>
<span index="3"></span>
<span index="4"></span>
<span index="5"></span>
</div>
<a id="prev" href="javascript:;" rel="external nofollow" rel="external nofollow" ><</a>
<a id="next" href="javascript:;" rel="external nofollow" rel="external nofollow" >></a>
</div>
<script>
var container = document.getElementById('container'),
list = document.getElementById('list'),
buttons = document.getElementById('buttons').getElementsByTagName('span'),
prev = document.getElementById('prev'),
next = document.getElementById('next'),
index = 1,
len = 5,
interval = 3000,
animated = false,
timer;
function animate(offset){
if(offset == 0) return;
animated = true;
var time = 150,
inter = 5,
speed = offset/(time/inter),
left = parseInt(list.style.left) + offset;
var go = function(){
if((speed>0 && parseInt(list.style.left)<left) || (speed<0 && parseInt(list.style.left)>left)){
list.style.left = parseInt(list.style.left) + speed + 'px';
setTimeout(go,inter);
}else{
list.style.left = left + 'px';
if(left > -100){
list.style.left = -300*len + 'px';
}
if(left < (-300*len)){
list.style.left = '-300px'
}
animated = false;
}
}
go();
}
function showButton(){
for(var i=0 ; i<buttons.length ; i++){
if(buttons[i].className == 'on'){
buttons[i].className = '';
break;
}
}
buttons[index - 1].className = 'on';
}
function play(){
timer = setTimeout(function(){
next.onclick();
play();
},interval);
}
function stop(){
clearTimeout(timer);
}
next.onclick = function(){
if(animated) {
return;
}
if(index == 5){
index = 1;
}else{
index++;
}
animate(-300);
showButton();
}
prev.onclick = function(){
if(animated) {
return;
}
if(index == 1){
index = 5;
}else{
index--;
}
animate(300);
showButton();
}
for (var i = 0; i < buttons.length; i++) {
buttons[i].onclick = function () {
if (animated) {
return;
}
if(this.className == 'on') {
return;
}
var myIndex = parseInt(this.getAttribute('index'));
var offset = -300 * (myIndex - index);
animate(offset);
index = myIndex;
showButton();
}
}
container.onmouseover = function(){
prev.style.display = next.style.display = 'block';
stop();
}
container.onmouseout = function(){
prev.style.display = next.style.display = 'none';
play();
}
play();
</script>
</body>
</html>

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