自己用原生javascript写的轮播图，面向对象思路，支持移动端手指触屏滑动。分页器圆点可以选择click点击或mouseover鼠标移入时触发。图片滚动用的setInterval，感觉setInterval不太适合做动画、图片滚动这类，不平滑。还是setTimeout或requestAnimateFrame函数做动画效果好。
文档做了移动端兼容，按照7.5rem的视口宽。HTML这个元素的font-size是document.documentElement.clientWidth / 7.5 得出来的，所以rem是动态的。
菜鸟一枚，高手看了别笑话，请多多指正哈。上源码：
先JavaScript：
function carouselFunc(obj){
var list=obj.listPar.getElementsByTagName(obj.btnName);
var len=list.length,lim=len-1,i=0;
var oriTarget=list[0];
var jg=obj.globalT/obj.step;
var timer,autoTimer,timerTo,outWaitT;
var t=4000;
var luoji=true,flag=false;
var startX,startY,endX,endY,nowX,nowY;
var offX,offY;
if(obj.bow>0){
obj.bow=-obj.bow;
}
function onceScrollFunc(target){
var j=Number(target.getAttribute("data-index"));
var k=Number(oriTarget.getAttribute("data-index"));
if(target.className!="active"){
oriTarget.className="";
target.className="active";
oriTarget=target;
i=j-1;
var oriLoc=obj.parent.offsetLeft;
var targetLoc=obj.bow*j;
clearInterval(timer);
clearInterval(autoTimer);
if(targetLoc<oriLoc){
var py=(targetLoc-oriLoc)/obj.step;
timer=setInterval(function(){
if(oriLoc>targetLoc){
oriLoc+=py;
obj.parent.style.left=oriLoc+"px";
} else{
clearInterval(timer);
obj.parent.style.left=targetLoc+"px";
}
},jg);
}else if(targetLoc>oriLoc){
var py=(targetLoc-oriLoc)/obj.step;
timer=setInterval(function(){
if(oriLoc<targetLoc){
oriLoc+=py;
obj.parent.style.left=oriLoc+"px";
} else{
clearInterval(timer);
obj.parent.style.left=targetLoc+"px";
}
},jg);
}
}
}
if(obj.c_Or_Mo=="mouseover"){
obj.listPar.onmouseover=function(event){
timerTo=setTimeout(function(){
var e=event||window.event;
var target=e.target||e.srcElement;
if(target.tagName.toLowerCase()==obj.btnName){
onceScrollFunc(target);
}
},120);
};
obj.listPar.onmouseout=function(event){
var e=event||window.event;
var target=e.target||e.srcElement;
if(target.tagName.toLowerCase()==obj.btnName){
clearTimeout(timerTo);
}
};
} else if(obj.c_Or_Mo=="click"){
obj.listPar.onclick=function(event){
var e=event||window.event;
var target=e.target||e.srcElement;
if(target.tagName.toLowerCase()==obj.btnName){
onceScrollFunc(target);
}
}
}
obj.prev.onclick=function(){
if(luoji&&!flag){
luoji=false;
clearInterval(autoTimer);
clearInterval(timer);
clearTimeout(outWaitT);
ScrollWidthFunc(0);
}
}
obj.next.onclick=function(){
if(luoji&&!flag){
luoji=false;
clearInterval(autoTimer);
clearInterval(timer);
clearTimeout(outWaitT);
ScrollWidthFunc(1);
}
}
function ScrollWidthFunc(dir){
if(dir==1){
list[i].className="";
if(i<lim){
i+=1;
}else{
i=0;
obj.parent.style.left="0px";
}
list[i].className="active";
oriTarget=list[i];
var nowScroll=obj.parent.offsetLeft;
var objScroll=nowScroll+obj.bow;
var py=obj.bow/obj.step;
timer=setInterval(function(){
if(nowScroll>objScroll){
nowScroll+=py;
obj.parent.style.left=nowScroll+"px";
} else{
clearInterval(timer);
obj.parent.style.left=objScroll+"px";
luoji=true;
}
},jg);
} else{
list[i].className="";
if(i>0){
i-=1;
}else{
i=lim;
obj.parent.style.left=obj.bow*(len+1)+"px";
}
list[i].className="active";
oriTarget=list[i];
var nowScroll=obj.parent.offsetLeft;
var objScroll=nowScroll-obj.bow;
var py=obj.bow/obj.step;
timer=setInterval(function(){
if(nowScroll<objScroll){
nowScroll-=py;
obj.parent.style.left=nowScroll+"px";
} else{
clearInterval(timer);
obj.parent.style.left=objScroll+"px";
luoji=true;
}
},jg);
}
}
if(document.documentElement.clientWidth<751){
obj.parent.addEventListener('touchstart',function(event){
if(!flag){
flag=true;
clearInterval(autoTimer);
clearInterval(timer);
clearTimeout(outWaitT);
var e=event||window.event;
tStart(e);
}
},false);
obj.parent.addEventListener('touchmove',function(event){
var e=event||window.event;
e.preventDefault();
tMove(e);
},false);
obj.parent.addEventListener('touchend',function(event){
var e=event||window.event;
tEnd(e);
},false);
} else{
if(obj.parent.addEventListener){
obj.parent.addEventListener('mousedown',function(event){
if(!flag){
flag=true;
clearInterval(autoTimer);
clearInterval(timer);
clearTimeout(outWaitT);
var e=event||window.event;
tStart(e);
}
},false);
obj.parent.addEventListener('mousemove',function(event){
var e=event||window.event;
e.preventDefault();
tMove(e);
},false);
obj.parent.addEventListener('mouseup',function(event){
var e=event||window.event;
tEnd(e);
},false);
}else{
obj.parent.attachEvent('onmousedown',function(event){
if(!flag){
flag=true;
clearInterval(autoTimer);
clearInterval(timer);
clearTimeout(outWaitT);
var e=event||window.event;
tStart(e);
}
});
obj.parent.attachEvent('onmousemove',function(event){
var e=event||window.event;
e.preventDefault();
tMove(e);
});
obj.parent.attachEvent('onmouseup',function(event){
var e=event||window.event;
tEnd(e);
});
}
}
function tStart(e){
var touch;
if(e.type=='touchstart'){
touch=e.targetTouches[0];
}else{
touch=e;
}
startX=touch.pageX;
startY=touch.pageY;
offX=obj.parent.offsetLeft;
offY=obj.parent.offsetTop;
}
function tMove(e){
if(flag){
var touch;
if(e.type=='touchmove'){
touch=e.targetTouches[0];
}else{
touch=e;
}
nowX=touch.pageX-startX;
nowY=touch.pageY-startY;
obj.parent.style.left=(offX+nowX)+"px";
}
}
function tEnd(e){
var touch;
if(e.type=='touchend'){
touch=e.changedTouches[0];
}else{
touch=e;
}
endX=touch.pageX;
var distance=obj.parent.offsetLeft;
var s=Math.abs(endX-startX);
var judge=Math.abs(obj.bow*0.2);
var lu=Math.abs(obj.bow)-s;
var py=Math.abs(obj.bow/obj.step);
if(luoji){
luoji=false;
if(s>judge){
if(distance<offX){
list[i].className="";
if(i<lim){
i+=1;
var objDis=obj.bow*(Math.floor(Math.abs(distance)/Math.abs(obj.bow))+1);
}else{
obj.parent.style.left=-s+"px";
distance=-s;
var objDis=obj.bow;
i=0;
}
list[i].className="active";
oriTarget=list[i];
flag=false;
timer=setInterval(function(){
if(distance>objDis){
distance-=py;
obj.parent.style.left=distance+"px";
}else{
clearInterval(timer);
obj.parent.style.left=objDis+"px";
luoji=true;
if(e.type=='touchend'){
clearInterval(autoTimer);
play(4000,1);
}
}
},jg);
}else{
list[i].className="";
if(i>0){
i-=1;
var objDis=obj.bow*(Math.floor(Math.abs(distance)/Math.abs(obj.bow)));
}else{
obj.parent.style.left=(obj.bow*(len+1)+s)+"px";
distance=obj.bow*(len+1)+s;
var objDis=obj.bow*len;
i=lim;
}
list[i].className="active";
oriTarget=list[i];
flag=false;
timer=setInterval(function(){
if(distance<objDis){
distance+=py;
obj.parent.style.left=distance+"px";
}else{
clearInterval(timer);
obj.parent.style.left=objDis+"px";
luoji=true;
if(e.type=='touchend'){
clearInterval(autoTimer);
play(4000,0);
}
}
},jg);
}
}else{
var targetP=obj.bow*(Math.floor(Math.abs(offX)/Math.abs(obj.bow)));
if(distance<targetP){
timer=setInterval(function(){
if(distance<targetP){
distance+=py;
obj.parent.style.left=distance+"px";
}else{
clearInterval(timer);
obj.parent.style.left=targetP+"px";
luoji=true;
if(e.type=='touchend'){
clearInterval(autoTimer);
play(4000,1);
}
}
},jg);
}else{
timer=setInterval(function(){
if(distance>targetP){
distance-=py;
obj.parent.style.left=distance+"px";
}else{
clearInterval(timer);
obj.parent.style.left=targetP+"px";
luoji=true;
if(e.type=='touchend'){
clearInterval(autoTimer);
play(4000,1);
}
}
},jg);
}
}
} else{
var targetP2=(i+1)*obj.bow;
flag=false;
if(targetP2<distance){
timer=setInterval(function(){
if(distance>targetP2){
distance-=py;
obj.parent.style.left=distance+"px";
}else{
clearInterval(timer);
obj.parent.style.left=targetP2+"px";
luoji=true;
if(e.type=='touchend'){
clearInterval(autoTimer);
play(4000,1);
}
}
},jg)
}else{
timer=setInterval(function(){
if(targetP2>distance){
distance+=py;
obj.parent.style.left=distance+"px";
}else{
clearInterval(timer);
obj.parent.style.left=targetP2+"px";
luoji=true;
if(e.type=='touchend'){
clearInterval(autoTimer);
play(4000,0);
}
}
},jg)
}
}
}
obj.viewport.onmouseover=function(){
clearInterval(autoTimer);
clearTimeout(outWaitT);
}
obj.viewport.onmouseout=function(event){
outWaitT=setTimeout(function(){
play(4000,1);
},1000);
};
function play(t,i){
autoTimer=setInterval(function(){
if(luoji){
luoji=false;
ScrollWidthFunc(i);
}
},t);
}
play(4000,1);
}
然后上HTML：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no">
<script type="text/javascript">
var viWidth=document.documentElement.clientWidth;
if(viWidth<750){
document.documentElement.style.fontSize=viWidth/7.5+"px";
}else{
document.documentElement.style.fontSize="100px";
}
</script>
<title>轮播图移动端试验</title>
<style type="text/css">
html{
height:100%;
text-align: center;
}
body{
width:7.5rem;
height:100%;
margin:0 auto;
text-align: center;
}
.clearfix:after{
content:"";
display: block;
clear: both;
height:0px;
}
.clearfix{
zoom:1;
}
.myTitle{
margin:0px;
line-height:0.6rem;
height:0.6rem;
padding-top:0.2rem;
padding-bottom:0.2rem;
text-align:center;
}
.carousel1{
width:7rem;
height:3.5rem;
margin-left:auto;
margin-right:auto;
position: relative;
overflow:hidden;
}
.viewportA{
width:7rem;
height:3.5rem;
position: relative;
overflow: hidden;
z-index: 1;
}
.parentA{
width:1000%;
position: absolute;
}
.parentA .item{
float:left;
position: relative;
width:7rem;
height:3.5rem;
margin:0px;
display:inline;
cursor: pointer;
}
.parentA .item img{
display: block;
width:7rem;
height:3.5rem;
}
.carousel1 .prevA{
position:absolute;
height:10%;
width:auto;
left:0;
top:45%;
z-index:3;
opacity:0.4;
cursor: pointer;
}
.carousel1 .nextA{
position:absolute;
height:10%;
width:auto;
right:0;
top:45%;
z-index:3;
opacity:0.4;
cursor: pointer;
}
.carousel1 .prevA:hover {
opacity:0.9;
}
.carousel1 .nextA:hover {
opacity:0.9;
}
.circleListA{
position:absolute;
z-index: 3;
bottom:0.2rem;
width:1.05rem;
height:0.15rem;
left:50%;
margin-left:-0.525rem;
padding-top:0.03rem;
padding-bottom:0.03rem;
zoom:1;
background-color:rgba(255,255,255,0.5);
border-radius:0.1rem;
}
.circleListA span{
float:left;
height:0.15rem;
width:0.15rem;
border-radius:70%;
margin-right:0.05rem;
background-color:white;
cursor: pointer;
}
.circleListA span:hover{
background:#ffd700;
}
.circleListA .active{
background:#ff4500!important;
}
</style>
</head>
<body>
<h1 class="myTitle"></h1>
<div class="carousel1" id="carousel1">
<div class="viewportA" id="viewportA">
<div id="parentA" class="parentA clearfix" style="left:-7rem">
<div class="item"><img src="data:image/5.jpg" width="100%"></div>
<div class="item"><img src="data:image/1.jpg" width="100%"></div>
<div class="item"><img src="data:image/2.jpg" width="100%"></div>
<div class="item"><img src="data:image/3.jpg" width="100%"></div>
<div class="item"><img src="data:image/4.jpg" width="100%"></div>
<div class="item"><img src="data:image/5.jpg" width="100%"></div>
<div class="item"><img src="data:image/1.jpg" width="100%"></div>
</div>
</div>
<img src="data:image/btn-left.png" id="prevA" class="prevA" alt="点击->上一张">
<img src="data:image/btn-right.png" id="nextA" class="nextA" alt="点击->下一张">
<div id="circleListA" class="circleListA clearfix">
<span data-index="1" class="active" style="margin-left:0.05rem"></span>
<span data-index="2" class=""></span>
<span data-index="3" class=""></span>
<span data-index="4" class=""></span>
<span data-index="5" class=""></span>
</div>
</div>
<script type="text/javascript" src="carousel-oop.js" charset="UTF-8"></script>
<script type="text/javascript">
if(window.addEventListener){
window.addEventListener("load",function(){
var carouselObj1={};
carouselObj1.carouselCon=document.getElementById("carousel1");
carouselObj1.viewport=document.getElementById("viewportA");
carouselObj1.parent=document.getElementById("parentA");
carouselObj1.listPar=document.getElementById("circleListA");
carouselObj1.btnName="span";
carouselObj1.prev=document.getElementById("prevA");
carouselObj1.next=document.getElementById("nextA");
carouselObj1.globalT=500;
carouselObj1.step=50;
carouselObj1.c_Or_Mo='mouseover';
carouselObj1.bow=-viewportA.clientWidth;
carouselFunc(carouselObj1);
},false);
}else if(window.attachEvent){
window.attachEvent("onload",function(){
var carouselObj1={};
carouselObj1.carouselCon=document.getElementById("carousel1");
carouselObj1.viewport=document.getElementById("viewportA");
carouselObj1.parent=document.getElementById("parentA");
carouselObj1.listPar=document.getElementById("circleListA");
carouselObj1.btnName="span";
carouselObj1.prev=document.getElementById("prevA");
carouselObj1.next=document.getElementById("nextA");
carouselObj1.globalT=500;
carouselObj1.step=50;
carouselObj1.c_Or_Mo='mouseover';
carouselObj1.bow=-viewportA.clientWidth;
carouselFunc(carouselObj1);
});
}
</script>
</body>
</html>