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How to implement simple tabs and automatic switching effects in js_javascript skills

WBOYOriginal: 2016-05-16 16:04:521108browse

The example in this article describes how to implement simple tabs and automatic switching effects in js. Share it with everyone for your reference. The specific analysis is as follows:

Based on the previous article "JS implements simple switchable tab effect", here we further implement a switching effect that can automatically switch. With this effect, you can make a simple focus map.

Description:

Set an identification number to 0, write a function that identifies 1 every few seconds, execute the switching effect, and then execute it.
Set the flag to 0 when it exceeds the length of the current tab.
Turn off the timer when the mouse moves over the tab and turn on the timer when the mouse moves away.

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</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>
window.onload = 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 = document.getElementById(tab_t);
  var tab_t_li = tab_t.getElementsByTagName(tab_t_tag);
  var tab_c = document.getElementById(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 = this.index;
     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 id="tab_t">
 <li class="act">选择1</li>
 <li>选择2</li>
 <li>选择3</li>
 <li>选择4</li>
 </ul>
 <div id="tab_c">
 <div>内容1</div>
 <div class="hide">内容2</div>
 <div class="hide">内容3</div>
 <div class="hide">内容4</div>
 </div>
</div> 
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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