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The simplest JavaScript image carousel code (two methods)_javascript skills
The simplest JavaScript image carousel code (two methods)_javascript skills
By changing the opacity attribute of each image:
Material picture:
Code 1:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-">
<title>最简单的轮播广告</title>
<style>
body, div, ul, li {
margin: ;
padding: ;
}
ul {
list-style-type: none;
}
body {
background: #;
text-align: center;
font: px/px Arial;
}
#box {
position: relative;
width: px;
height: px;
background: #fff;
border-radius: px;
border: px solid #fff;
margin: px auto;
}
#box .list {
position: relative;
width: px;
height: px;
overflow: hidden;
border: px solid #ccc;
}
#box .list li {
position: absolute;
top: ;
left: ;
width: px;
height: px;
opacity: ;
transition: opacity .s linear
}
#box .list li.current {
opacity: ;
}
#box .count {
position: absolute;
right: ;
bottom: px;
}
#box .count li {
color: #fff;
float: left;
width: px;
height: px;
cursor: pointer;
margin-right: px;
overflow: hidden;
background: #F;
opacity: .;
border-radius: px;
}
#box .count li.current {
color: #fff;
opacity: .;
font-weight: ;
background: #f
}
</style>
</head>
<body>
<div id="box">
<ul class="list">
<li class="current" style="opacity: ;"><img src="img/images/.jpg" width="" height=""></li>
<li style="opacity: ;"><img src="img/images/.jpg" width="" height=""></li>
<li style="opacity: ;"><img src="img/images/.jpg" width="" height=""></li>
<li style="opacity: ;"><img src="img/images/.jpg" width="" height=""></li>
<li style="opacity: ;"><img src="img/images/.jpg" width="" height=""></li>
</ul>
<ul class="count">
<li class="current"></li>
<li class=""></li>
<li class=""></li>
<li class=""></li>
<li class=""></li>
</ul>
</div>
<script>
var box=document.getElementById('box');
var uls=document.getElementsByTagName('ul');
var imgs=uls[].getElementsByTagName('li');
var btn=uls[].getElementsByTagName('li');
var i=index=; //中间量，统一声明；
var play=null;
console.log(box,uls,imgs,btn);//获取正确
//图片切换, 淡入淡出效果我是用（transition: opacity .s linear）做的,不纠结、简单 在css里面
function show(a){ //方法定义的是当传入一个下标时，按钮和图片做出对的反应
for(i=;i<btn.length;i++ ){
btn[i].className=''; //很容易看懂吧？每个按钮都先设置成看不见，然后把当前按钮设置成可见。
btn[a].className='current';
}
for(i=;i<imgs.length;i++){ //把图片的效果设置和按钮相同
imgs[i].style.opacity=;
imgs[a].style.opacity=;
}
}
//切换按钮功能，响应对应图片
for(i=;i<btn.length;i++){
btn[i].index=i; //不知道你有没有发现，循环里的方法去调用循环里的变量体i，会出现调到的不是i的变动值的问题。所以我先在循环外保存住
btn[i].onmouseover=function(){
show(this.index);
clearInterval(play); //这就是最后那句话追加的功能
}
}
//自动轮播方法
function autoPlay(){
play=setInterval(function(){ //这个paly是为了保存定时器的，变量必须在全局声明 不然其他方法调不到 或者你可以调用auto.play 也许可以但是没时间试了
index++;
index>=imgs.length&&(index=);//可能有优先级问题，所以用了括号，没时间测试了。
show(index);
},)
}
autoPlay();//马上调用，我试过用window.onload调用这个方法，但是调用之后影响到了其他方法，使用autoPlay所以只能这样调用了
//div的鼠标移入移出事件
box.onmouseover=function(){
clearInterval(play);
};
box.onmouseout=function(){
autoPlay();
};
//按钮下标也要加上相同的鼠标事件，不然图片停止了，定时器没停，会突然闪到很大的数字上。 貌似我可以直接追加到之前定义事件中。
</script>
</body>
</html>Code 2:
The first step is to download a jquery library plug-in. jquery.js can be downloaded from many places on the Internet. The downloaded plug-in should be placed in the directory. Then link
in the html documentThe second step is to lay out a DIV, such as:
<div id="scroll"> <p class="subl">上一张<p/> <p class="subr">下一张<p/> <ul> <li style="background:red;display:block;"></li> //上面的ｌｉ要设定为显示，因为是第一张图片． <li style="background:green;"></li> <li style="background:gray;"></li> <li style="background:orange;"></li> </ul> </div>
In order to make it easier for netizens to download clearly, I did not use the image path, because it will not be visible on your computer. Here I use the background color.
The third step is to write CSS. Anyone who knows the basics of CSS can understand the following CSS.
#scroll{width:100%; height:180px; background-color:white; position:relative;border-bottom:1px solid gray;}//这里是给整个大的ＤＩＶ设定属性．
#scroll ul{height:180px; list-style:none;}//ＤＩＶ下的ＵＬ属性．
#scroll ul li{width:100%; height:180px;margin:0px; padding:0px; display:none;}//ＤＩＶ下的ＵＬ下的ＬＩ属性．注意：display:none;因为要将所有的ｌｉ隐藏了先．当点击的时候在显示出来．
.subl{position:absolute; bottom:20px; left:40%; width:80px;height:20px; line-height:20px; text-align:center;font-size:16px;font-weight:bold; cursor:pointer;}//上一张按钮的属性．注意一个绝对定位．
.subr{
position:absolute;
bottom:20px; right:40%;
width:80px;height:20px; line-height:20px; text-align:center;font-size:16px;font-weight:bold;cursor:pointer;
}//下一张按钮的属性．注意一个绝对定位．
.subr:hover{ background:yellow;border-radius:10px;}
.subl:hover{ background:yellow;border-radius:10px;}
//以上两个hover是鼠标经过的效果．The fourth step is the jｑuery code! It's also very simple. Read the code first and you will be able to use it!
<script type="text/javascript">
/*轮播*/
$(function(){
var i=0;
var len=$("#scroll ul li").length-1;
$(".subl").click(function(){
if(i==len){
i=-1;
}
i++;
$("#scroll ul li").eq(i).fadeIn().siblings().hide();
});
//到这里分开！上面的是上一张点击的效果代码，下面的是下一张点击的效果代码．
$(".subr").click(function(){//获取类名的点击事件．
if(i==0){
i=len+1;
}
i--;
$("#scroll ul li").eq(i).fadeIn().siblings().hide();
});
});
/*轮播*/
</script>Four easy steps to make a simple wheel!
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