使用原生的javascript来实现轮播图
程序员文章站
2023-01-10 10:10:06
下面看下js轮播图的实现代码，具体代码如下所示：
下面看下js轮播图的实现代码，具体代码如下所示：
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
* {
padding: 0;
margin: 0;
list-style: none;
border: 0;
}
.all {
width: 500px;
height: 200px;
padding: 7px;
border: 1px solid #ccc;
margin: 100px auto;
position: relative;
}
.screen {
width: 500px;
height: 200px;
overflow: hidden;
position: relative;
}
.screen li {
width: 500px;
height: 200px;
overflow: hidden;
float: left;
}
.screen ul {
position: absolute;
left: 0;
top: 0px;
width: 3000px;
}
.all ol {
position: absolute;
right: 10px;
bottom: 10px;
line-height: 20px;
text-align: center;
}
.all ol li {
float: left;
width: 20px;
height: 20px;
background: #fff;
border: 1px solid #ccc;
margin-left: 10px;
cursor: pointer;
}
.all ol li.current {
background: yellow;
}
#arr {
display: none;
}
#arr span {
width: 40px;
height: 40px;
position: absolute;
left: 5px;
top: 50%;
margin-top: -20px;
background: #000;
cursor: pointer;
line-height: 40px;
text-align: center;
font-weight: bold;
font-family: '黑体';
font-size: 30px;
color: #fff;
opacity: 0.3;
border: 1px solid #fff;
}
#arr #right {
right: 5px;
left: auto;
}
</style>
</head>
<body>
<div class="all" id='box'>
<div class="screen">
<ul>
<li><img src="images/1.jpg" width="500" height="200"/></li>
<li><img src="images/2.jpg" width="500" height="200"/></li>
<li><img src="images/3.jpg" width="500" height="200"/></li>
<li><img src="images/4.jpg" width="500" height="200"/></li>
<li><img src="images/5.jpg" width="500" height="200"/></li>
</ul>
<ol>
</ol>
</div>
<div id="arr"><span id="left"><</span><span id="right">></span></div>
</div>
<script>
function $(element) {
return document.getelementbyid(element);
}
var box = $("box");
var screen = box.children[0];
var ul = screen.children[0];
var ullis = ul.children;
var ol = screen.children[1];
var arr = $("arr");
var left = $("left");
var right = $("right");
//动态创建小图标
for (var i = 0; i < ullis.length; i++) {
var li = document.createelement("li");
li.innerhtml = i + 1;
ol.appendchild(li);
}
//设置这些个小图标
var ollis = ol.children;
var imgwidth = screen.offsetwidth;
for (var j = 0; j < ollis.length; j++) {
ollis[j].index = j;
ollis[j].onmouseover = function () {
//排他思想
for (var i = 0; i < ollis.length; i++) {
ollis[i].classname = "";
}
this.classname = "current";
var target = -imgwidth * this.index;
cutton(ul, target, 20);
//为了让点击事件和小面的小图标能够一一对应，设置他们的索引值相同
pic = square = this.index;
}
}
//给小图标设置一个初始样式
ol.children[0].classname = "current";
//给ul追加一张图
ul.appendchild(ul.children[0].clonenode(true));
//设置箭头的显示与隐藏
box.onmouseover = function () {
arr.style.display = "block";
//鼠标放上去的时候，不再自动滚动
clearinterval(timer);
}
box.onmouseout = function () {
arr.style.display = "none";
//鼠标离开的时候，继续自动滚动
timer = setinterval(playnext, 1000);
}
//设置点击左右小箭头的事件且要求小图标要跟着变化
//1.设置点击右侧箭头
var pic = 0;//记录当前为第几项用
var square = 0;//记录小图标的索引值
/* right.onclick = function () {//存在的问题是当移动到最后一张的时候，无法跳转到第一张
pic++;
var target = -pic * imgwidth;
cutton(ul, target, 20);
}*/
//方法改进
/*right.onclick = function () {
//先对pic做一个判断，当pic的值为5的时候，实现一个跳转
if (pic == ullis.length - 1) {
ul.style.left = 0;
pic = 0;
}
pic++;
var target = -pic * imgwidth;
cutton(ul, target, 20);
if (square == ollis.length - 1) {
square = -1;//下面会加一，就变成了0
}
square++;
//排他思想
for (var i = 0; i < ollis.length; i++) {
ollis[i].classname = "";
}
ollis[square].classname = "current";
}*/
//使用封装函数
right.onclick = function () {
playnext();
}
//2.设置点击左侧箭头
left.onclick = function () {//要判断一下当pic为零时的情况
if (pic == 0) {
ul.style.left = -imgwidth * (ullis.length - 1) + "px";//要记得加单位
pic = ullis.length - 1;//给pic重新赋一个值
}
pic--;
var target = -pic * imgwidth;
cutton(ul, target, 20);
//设置小图标样式
if (square == 0) {
square = ollis.length;
}
square--;
for (var i = 0; i < ollis.length; i++) {
ollis[i].classname = "";
}
ollis[square].classname = "current";
}
//设置自动滚动
//1.封装点击右侧小箭头事件
function playnext() {
//先对pic做一个判断，当pic的值为5的时候，实现一个跳转
if (pic == ullis.length - 1) {
ul.style.left = 0;
pic = 0;
}
pic++;
var target = -pic * imgwidth;
cutton(ul, target, 20);
if (square == ollis.length - 1) {
square = -1;//下面会加一，就变成了0
}
square++;
//排他思想
for (var i = 0; i < ollis.length; i++) {
ollis[i].classname = "";
}
ollis[square].classname = "current";
}
//2.调用这个封装的函数，并且设置一个间歇性计时器
var timer = null;
timer = setinterval(playnext, 1000);
//封装函数
function cutton(obj, target, stp) {
clearinterval(obj.timer);
obj.timer = setinterval(function () {
var step = stp;
step = obj.offsetleft > target ? -step : step;
if (math.abs(obj.offsetleft - target) >= math.abs(step)) {
obj.style.left = obj.offsetleft + step + "px";
} else {
obj.style.left = target + "px";
clearinterval(obj.timer);
}
}, 15)
}
</script>
</body>
</html>
补充：原生javascript实现banner图自动轮播切换
一般在做banner轮播图的时候都是用jquery，因为代码少，方便，不需要花费很长的时间去获取某个元素作为变量，然后再进行操作，只要一个$就搞定了。但是今天我用原生的javascript做了一下这个轮播效果，感觉还行，以下是部分js源代码，仅供参考！文章底部查看效果演示。
1、鼠标离开banner图，每隔2s切换一次；
2、鼠标滑过下方的小按钮，可以切换图片；
3、鼠标点击左右按钮，可以切换图片。
var opic,oli,anniu,ali,alength,num,timer,og,_index,ospan;
window.onload = function(){
opic = document.getelementsbyclassname("pic")[0];
oli = opic.getelementsbytagname("li");
anniu = document.getelementsbyclassname("anniu")[0];
ali = anniu.getelementsbytagname("li");
alength = ali.length;
num = 0;
og = document.getelementsbyclassname("g")[0];
ospan = og.getelementsbytagname("span");
oleft = ospan[0];
oright = ospan[1];
start();
og.onmouseover = end;
og.onmouseout = start;
for(var j=0; j<alength; j++){
ali[j].index = j;
ali[j].onmouseover = change;
}
oright.onclick = time;
oleft.onclick = times;
}
//自动轮播开始或结束
function start(){
timer = setinterval(time,2000);
hide();
}
function end(){
clearinterval(timer);
show();
}
//图片切换++
function time(){
for(var i=0; i<alength; i++){
oli[i].style.display = "none";
ali[i].classname = "";
}
num++;
num = num % 4;
oli[num].style.display = "block";
ali[num].classname = "on";
}
//图片切换--
function times(){
for(var i=0; i<alength; i++){
oli[i].style.display = "none";
ali[i].classname = "";
}
num--;
num = (num+4)%4;
oli[num].style.display = "block";
ali[num].classname = "on";
}
//鼠标滑过按钮，图片轮播
function change(){
_index = this.index;
for(var k=0; k<alength; k++){
ali[k].classname = "";
oli[k].style.display = "none";
}
ali[_index].classname = "on";
oli[_index].style.display = "block";
}
//左右按钮显示或隐藏
function show(){
ospan[0].style.display = "block";
ospan[1].style.display = "block";
}
function hide(){
ospan[0].style.display = "none";
ospan[1].style.display = "none";
}
以上所述是小编给大家介绍的使用原生的javascript来实现轮播图，希望对大家有所帮助
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