实现轮播图
学习前端差不多两三个月，在这里记录分享一下。因本人菜鸟一枚，希望大佬们多多指点，勿喷。
通过计算每一张图片高度实现滑动轮播图
HTML代码：
<div class="fate"> <div class="lancer"> <ul class="saber"> <li><img src="img/illust_13010631_20191118_150928.jpg"></li> <li><img src="img/illust_13010631_20191118_150928.jpg"></li> <li><img src="img/illust_13010631_20191118_150928.jpg"></li> <li><img src="img/illust_13010631_20191118_150928.jpg"></li> <li><img src="img/illust_13010631_20191118_150928.jpg"></li> </ul> </div> </div> <div class="archer"> <button class="goup" onclick="goup()"><</button> <button class="godown" onclick="godown()">></button> </div>
CSS代码：
* {
transition: all 1s;
margin: 0px;
padding: 0px;
}
.fate {
position: absolute;
top: 0%;
width: 512px;
height: 512px;
overflow: hidden;
}
ul li {
list-style: none;
}
.lancer{
position: absolute;
top: 0%;
width: 100%;
height: 100%;
}
.saber {
top: 0px;
position: absolute;
}
.archer{
position: absolute;
}
button {
z-index: 99;
}
JS代码：
var index=0;
function godown(){
var li = document.getElementsByTagName("li");
//获取单个li宽度（单张图片高度）
var liHeight = li[0].scrollHeight;
var goup=document.getElementsByClassName("goup");
var lancer=document.getElementsByClassName("lancer")[0];
if(index<4){
index++;
}else{
index=0;
}
lancer.style.top = -index*liHeight+"px";
}
function goup(){
var li = document.getElementsByTagName("li");
//获取单个li宽度（单张图片高度）
var liHeight = li[0].scrollHeight;
var goup=document.getElementsByClassName("goup");
var lancer=document.getElementsByClassName("lancer")[0];
if(index>0){
index--;
}else{
index=4;
}
lancer.style.top = -index*liHeight+"px";
}
如有错误望指出。
利用z-index实现轮播图
HTML代码
<div class="fate">
<div class="saber">
<ul>
<li class="archer active"><img src="img/illust_13010631_20191118_150928.jpg"></li>
<li class="archer"><img src="img/illust_13010631_20191118_150928.jpg"></li>
<li class="archer"><img src="img/illust_13010631_20191118_150928.jpg"></li>
<li class="archer"><img src="img/illust_13010631_20191118_150928.jpg"></li>
<li class="archer"><img src="img/illust_13010631_20191118_150928.jpg"></li>
</ul>
</div>
</div>
<div class="lancer">
<button id="goup">></button>
<button id="godown"><</button>
</div>
CSS代码
li {
list-style: none;
}
.archer {
position: absolute;
top: 0%;
display: none;
}
.active {
display: block;
}
button {
position: absolute;
top: 70%;
width: 50px;
}
#goup {
left: 400px;
}
#godown {
left: 0px;
}
JS代码
var pic = document.getElementsByTagName("li");
var archer = document.getElementsByClassName("archer");
var goup = document.getElementById("goup");
var godown = document.getElementById("godown");
var index = 0;
goup.onclick = function() {
for (var i = 0; i < pic.length; i++) {
pic[i].className = "archer";
}
if (index < 4) {
index++;
} else {
index = 0;
}
pic[index].className = "active";
}
godown.onclick = function() {
for (var i = 0; i < pic.length; i++) {
pic[i].className = "archer";
}
if (index > 0) {
index--;
} else {
index = 4;
}
pic[index].className = "active";
}
利用index来实现轮播，但是生硬。
结语
以上就是两种方法实现轮播图效果。
