编程 Javascript jQuery

JQuery常见节点操作实例分析

Posted in jQuery onMay 15, 2019

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

JQuery常见节点操作实例分析

<!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.3water.com/code/HtmlJsRun 测试上述代码运行效果。

希望本文所述对大家jQuery程序设计有所帮助。

JQuery常见节点操作实例分析

- Author -

SpecYue

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