今天学习了一下轮播图的写作，想到前一阵学过的无缝滚动得思想，所以就把轮播与滚动结合了一下。不过我的代码的神逻辑我自己都不敢恭维，在没网没参照的情况下，只能硬着头皮往下写，希望跟大家共勉吧。
js运动框架的代码如下：
//获取样式
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}else{
return getComputedStyle(obj,false)[attr];
}
}
//运动框架
//complete:time,ease,fn
function move(obj,json,complete){
var dis = {};
var start = {};
for(var name in json){
start[name] = parseInt(getStyle(obj,name));
dis[name] = json[name] - start[name];
}
complete = complete || {};
complete.time = complete.time || 1000;
complete.ease = complete.ease || "ease-in";
var count = Math.floor(complete.time/30);
var n = 0;
clearInterval(obj.timer);
obj.timer = setInterval(function(){
n++;
for(var name in json){
switch (complete.ease){
case "linear":
var a = n/count;
var cur = start[name] + dis[name]*a;
break;
case "ease-in":
var a = n/count;
var cur = start[name] + dis[name]*a*a*a;
break;
case "ease-out":
var a = 1 - n/count;
var cur = start[name] + dis[name]*(1-a*a*a);
break;
}
if(name == "opacity"){
obj.style.opacity = cur;
obj.style.filter = "alpha(opacity="+cur*100 +")";
}else{
obj.style[name] = cur + "px";
}
}
if(n == count){
clearInterval(obj.timer);
if(complete.fn) complete.fn();
}
},30)
}
运行的效果图如下：
自动轮播，下方红色按钮同时变换，点击左右箭头分别到达上一张或下一张，问题主要是在第一张和最后一张上面。
神逻辑即将出现，请访客给出好建议哦！！
<!DOCTYPE HTML>
<html>
<head>
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
#wrap{
width: 590px;
height: 340px;
margin:100px auto;
position: relative;
overflow: hidden;
}
#box{
position: absolute;
left: 0;
top: 0;
}
#box li{
width: 590px;
height: 340px;
list-style: none;
float: left;
}
#btn{
position: absolute;
left: 50%;
margin-left:-100px ;
bottom: 20px;
}
#btn li{
width: 30px;
height:30px;
border-radius: 50%;
background: #ccc;
float: left;
list-style: none;
margin-right: 10px;
}
#btn li.active{
background: red;
}
#wrap a{
display: block;
width: 50px;
height: 50px;
background: rgba(0,0,0,0.5);
position: absolute;
top: 145px;
color: #fff;
text-decoration: none;
line-height: 50px;
text-align: center;
}
#prev{
left: 0;
}
#next{
right: 0;
}
</style>
<script src="move.js"></script>
</head>
<body>
<div id="wrap">
<ul id="box">
<li><img src="img/1.jpg"></li>
<li><img src="img/2.jpg"></li>
<li><img src="img/3.jpg"></li>
<li><img src="img/4.jpg"></li>
<li><img src="img/5.jpg"></li>
</ul>
<ol id="btn">
<li class="active"></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ol>
<a id="prev" href="javascript:;">←</a>
<a id="next" href="javascript:;">→</a>
</div>
</body>
</html>
<script>
window.onload = function(){
var oWrap = document.getElementById("wrap");
var oBox = document.getElementById("box");
var aBox = oBox.getElementsByTagName("li");
var aBtn = document.getElementById("btn").getElementsByTagName("li");
var oPrev = document.getElementById("prev");
var oNext = document.getElementById("next");
var iNow = 0;
var timer = null;
oBox.innerHTML += oBox.innerHTML;
oBox.style.width = aBox[0].offsetWidth * aBox.length + "px";
oBox.style.width = aBox[0].offsetWidth*aBox.length +"px";
//红色按钮的样式
function tab(){
for(var i=0;i<aBtn.length;i++){
aBtn[i].className = "";
}
move(oBox,{left:-aBox[0].offsetWidth*iNow});
aBtn[iNow].className = "active";
}
//下一张（神逻辑在此，擦汗！！希望访客给出更好建议）
function next(){
if(iNow==aBox.length/2){
oBox.style.left = 0;
iNow = 0;
}
for(var i=0;i<aBtn.length;i++){
aBtn[i].className = "";
}
iNow++;
var iNew = iNow;
if(iNew == aBtn.length) iNew = 0;
aBtn[iNew].className = "active";
move(oBox,{left:-aBox[0].offsetWidth*iNow});
}
//红色圆钮得点击效果
for(var i=0;i<aBtn.length;i++){
aBtn[i].index = i;
aBtn[i].onclick = function(){
iNow = this.index;
tab();
}
}
//上一张（与“上一张”一样的神逻辑！！）
oPrev.onclick = function(){
if(iNow<=aBox.length/2 - 1){
iNow+=5;
oBox.style.left = -aBox[0].offsetWidth*iNow + "px";
}
for(var i=0;i<aBtn.length;i++){
aBtn[i].className = "";
}
iNow--;
var iNew = iNow-5;
if(iNew == -1) iNew = aBtn.length-1;
aBtn[iNew].className = "active";
move(oBox,{left:-aBox[0].offsetWidth*iNow});
}
oNext.onclick = next;
clearInterval(timer);
timer = setInterval(next,2000);
oWrap.onmouseout = function(){
timer = setInterval(next,2000);
}
oWrap.onmouseover = function(){
clearInterval(timer);
}
}
</script>