This article describes how to implement simple tabs and automatic switching effects by JS. Share it for your reference. The specific analysis is as follows:
Here is the article "JS implements simple switchable tab effect》 Based on the fact that the switching effect can be automatically switched, you can use this effect to make a simple focus picture.
illustrate:
Set a flag number to 0, write a function that flags +1 every few seconds, executes the switching effect, and then executes.
Set the flag to 0 when the flag exceeds the current tab length.
Turn off the timer when the mouse moves to the tab, turn on the timer when the mouse moves away.
<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>Untitled document</title>
<style>
body,ul,li{
margin:0;
padding:0;
font:12px/1.5 arial;
}
ul,li{
list-style:none;
}
.wrap{
width:500px;
margin:20px auto;
}
.hide{
display:none;
}
#tab_t{
height:25px;
border-bottom:1px solid #ccc;
}
#tab_t li{
float:left;
width:80px;
height:24px;
line-height:24px;
margin:0 4px;
text-align:center;
border:1px solid #ccc;
border-bottom:none;
background:#f5f5f5;
cursor:pointer
}
#tab_t .act{
position:relative;
height:25px;
margin-bottom:-1px;
background:#fff;
}
#tab_c{
border:1px solid #ccc;
border-top:none;
padding:20px;
}
</style>
<script>
= function(){
tab("tab_t","li","tab_c","div","onmouseover")
function tab(tab_t,tab_t_tag,tab_c,tag_c_tag,evt){
var tab_t = (tab_t);
var tab_t_li = tab_t.getElementsByTagName(tab_t_tag);
var tab_c = (tab_c);
var tab_c_li = tab_c.getElementsByTagName(tag_c_tag);
var len = tab_t_li.length;
var i=0;
var timer = null;
var num=0;
for(i=0; i<len; i++){
tab_t_li[i].index = i;
tab_t_li[i][evt] = function(){
clearInterval(timer);
num = ;
tab_change()
}
tab_t_li[i].onmouseout = function(){
autoplay();
}
}
function tab_change(){
for(i=0; i<len; i++){
tab_t_li[i].className = '';
tab_c_li[i].className = 'hide';
}
tab_t_li[num].className = 'act';
tab_c_li[num].className = '';
}
function autoplay(){
timer = setInterval(function(){
num++;
if(num>=len) num=0;
tab_change();
},1000);
}
autoplay();
}
}
</script>
</head>
<body>
<div class="wrap">
<ul >
<li class="act">choose1</li>
<li>choose2</li>
<li>choose3</li>
<li>choose4</li>
</ul>
<div >
<div>content1</div>
<div class="hide">content2</div>
<div class="hide">content3</div>
<div class="hide">content4</div>
</div>
</div>
</body>
</html>
I hope this article will be helpful to everyone's JavaScript programming.