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Detailed explanation of the use of jQuery's next() function

黄舟Original: 2016-12-15 14:51:262038browse

Detailed explanation of the use of jQuery's next() function:
This function has a large number of applications in the code. The usage of this function will be introduced below with examples.
It can obtain an element set containing the immediately following sibling elements of each element in the matching element set.
In the above concept, there are the following points that need special attention:
1. "Adjacent", that is to say, the element obtained must be immediately adjacent to the matching element, and there cannot be other elements in between.
2. "Similar", that is to say, the element obtained must be the same level element as the matching element.
3. "Behind", that is, i means that the element obtained must be located behind the matching element.
Syntax structure:

$(selector).next(exPR)

Parameter list:

Parameter Description

expr Optional. Filter expression.

Example code:
Example 1:

<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/CSS">.father{
  height:200px;
  width:200px;
  border:1px solid blue;}</style><script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script><script type="text/Javascript">$(document).ready(function(){
  $("p").next().css("color","blue")
})</script> </head><body><div class="father"><p>我是p元素</p><span>我是span元素</span><p>我是p元素</p><div>我是div元素</div></div></body></html>

The above code can set the font color of all sibling elements immediately behind the p element to blue.
Example 2:

<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">.father{
  height:200px;
  width:200px;
  border:1px solid blue;}</style><script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script><script type="text/javascript">$(document).ready(function(){
  $("p").next("span").css("color","blue")
})</script> </head><body><div class="father">
  <p>我是p元素</p>
  <span>我是span元素</span>
  <p>我是p元素</p>
  <div>我是div元素</div></div></body></html>

The above code can set the font diffraction of the span element in the sibling element immediately behind the p element to blue.
Example 3:

<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">*{
  margin:0px;
  padding:0px;
  font-size:14px;}ul{list-style:none;}.main .nav{
  width:100px;
  margin:0px auto;
  margin-top:3px;}.main .nav a{
  width:100px;
  height:25px;
  line-height:25px;
  text-align:center;
  text-decoration:none;
  background-color:green;
  display:block;}.main .nav .navcontent{display:none;}</style><script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script><script type="text/javascript">$(document).ready(function()
{  var navs=$(".nav");  var navcontents=$(".navcontent");  var navlen=navs.length;
 
  $(".nav a").click(function(){    if($(this).next().css("display")=="none")
    {
      $(this).next().css("display","block")
    }    else
    {
      $(this).next().css("display","none") 
    }   
 }) 
})</script></head><body><div>
  <ul class="main">
   <li class="nav">
    <a href="#">蚂蚁部落</a>
    <ul class="navcontent">
     <li>搜索优化</li>
     <li>CSS专区</li>
     <li>asp专区</li>
    </ul>
   </li>
   <li class="nav">
    <a href="#">前台专区</a>
    <ul class="navcontent">
     <li>搜索优化</li>
     <li>CSS专区</li>
     <li>ASP专区</li>
    </ul>
   </li>
   <li class="nav">
    <a href="#">后台专区</a>
    <ul class="navcontent">
     <li>搜索优化</li>
     <li>CSS专区</li>
     <li>ASP专区</li>
    </ul>
   </li>
  </ul></div></body></html>

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