JQuery常见节点操作实例分析

更新时间：2020-08-26 21:42:01 作者：startmvc

本文实例讲述了JQuery常见节点操作。分享给大家供大家参考，具体如下：插入节点append()和a

本文实例讲述了JQuery常见节点操作。分享给大家供大家参考，具体如下：

插入节点

append()和appengTo()：在现存元素内部，从后面插入 prepend()和prependTo()：在现存元素外部，从前面插入 after()和insertAfter()：在现存元素外部，从后面插入 before()和insertBefore():在现存元素外部，从前面插入

新建节点的插入


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
 <script type="text/javascript">
 $(function () {
 // $('#div1').html('')这种用字符串的方式塞进去的性能是最高的，
 // 但是有点时候不方便用，因为这样会重写div1里面的元素
 $a=$('<a href="#" rel="external nofollow" >链接</a>>');
 $('#div1').append($a);/*在最后加入字符串，append从现成的元素的后面插入元素*/
 $a.appendTo($('#div1'));/*和append效果相同*/
 $p=$('<p>这是一个p标签</p>');
 $("#div1").prepend($p);
 $h2=$('<h2>这是一个h2</h2>');
 $('#div1').after($h2);
 $h3=$('<h3>这是一个h3</h3>');
 $('#div1').before($h3);
 })
 </script>
</head>
<body>
 <div id="div1">
 <h1> 这是一个h1元素</h1>
 </div>
</body>
</html>

已有节点的插入


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
 <script type="text/javascript">
 $(function () {
 $('#p1').insertBefore($("#title01"));/*换两个节点顺序*/
 })
 </script>
</head>
<body>
 <h1 id="title01">这是一个h1元素</h1>
 <p id="p1">这是一个p元素</p>
 <span id="span01">这是一个span元素</span>
</body>
</html>

删除节点

remove()：删除节点


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
 <script type="text/javascript">
 $(function () {
 $('#p1').insertBefore($("#title01"));/*换两个节点顺序*/
 $('#p1').remove();
 })
 </script>
</head>
<body>
 <h1 id="title01">这是一个h1元素</h1>
 <p id="p1">这是一个p元素</p>
 <span id="span01">这是一个span元素</span>
</body>
</html>

关于a标签的问题


<a href="javascript:alert('ok?');" rel="external nofollow" >链接</a>

如果这样写就是插入JavaScript语句，弹出ok，如果是写#就是连接到页面顶部。

todolist网页

实现一个用户自己列计划的网页


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>todolist</title>
 <style type="text/css">
 .list_con {
 width: 400px;
 margin: 50px auto 0;
 }
 .inputtxt {
 width: 350px;
 height: 30px;
 border: 1px solid #ccc;
 padding: 0px;
 text-indent: 10px;
 }
 .inputbtn {
 width: 40px;
 height: 32px;
 padding: 0px;
 border: 1px solid #ccc;
 }
 .list {
 margin: 0;
 padding: 0;
 list-style: none;
 margin-top: 20px;
 }
 .list li {
 height: 30px;
 line-height: 30px;
 border-bottom: 1px solid #ccc;
 }
 .list li span {
 float: left;
 }
 .list li a {
 float: right;
 text-decoration: none;
 margin: 0 10px;
 }
 </style>
 <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
 <script type="text/javascript">
 $(function () {
 var $inputtxt = $('#txt1');
 var $btn = $('#btn1');
 var $ul = $('#list');
 $btn.click(function () {
 var $val = $inputtxt.val();
 /*获取input框的值*/
 if ($val == "") {
 alert("请输入内容");
 return;
 }
 else {
 alert(1);
 var $li=$('<li><span>'+$val+'</span><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="up"> ↑ </a><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="down"> ↓ </a><a\n' +
 ' href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></li>');
 $li.appendTo($ul);
 $inputtxt.val("");/*获取到值之后，清空*/
 var $a=$li.find('.del');
 $a.click(function () {
 $(this).parent().remove();
 });
 $li.find('.up').click(function () {
 $(this).parent().insertBefore($(this).parent().prev());
 });
 $li.find('.down').click(function () {
 $(this).parent().insertAfter($(this).parent().next());
 });
 }
 });
 $del=$(".del");
 $del.click(function () {
 $(this).parent().remove();
 });
 $('.up').click(function () {
 $(this).parent().insertBefore($(this).parent().prev());
 });
 $('.down').click(function () {
 $(this).parent().insertAfter($(this).parent().next());
 });
 })
 </script>
</head>
<body>
<div class="list_con">
 <h2>To do list</h2>
 <input type="text" name="" id="txt1" class="inputtxt">
 <input type="button" name="" value="增加" id="btn1" class="inputbtn">
 <ul id="list" class="list">
 <li><span>学习html</span><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="up"> ↑ </a><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="down"> ↓ </a><a
 href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></li>
 <li><span>学习css</span><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="up"> ↑ </a><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="down"> ↓ </a><a
 href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></li>
 <li><span>学习javascript</span><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="up"> ↑ </a><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="down">
 ↓ </a><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></li>
 </ul>
</div>
</body>
</html>

感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具：http://tools.jb51.net/code/HtmlJsRun 测试上述代码运行效果。