最近做一个项目，需要对表格进行增行和删行。

研究了一下jquery操作dom的方法和事件委托原理，下面是我编写的例子，源码传上，欢迎高手指点。

功能：

支持在指定行下面增行；

支持删行指定行；

增行、删行后自动计算序号；使用table背景设置表格边框；

代码：

  1.  <!DOCTYPE html>
  2.  <html>
  3.  <head>
  4.  <meta charset="utf-8">
  5.  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  6.  <title>Examples</title>
  7.  <meta name="description" content="">
  8.  <meta name="keywords" content="">
  9.  <link href="" rel="stylesheet">
  10.  <script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.js"></script>
  11.  <style type="text/css">
  12.      body{
  13.          font-size: 16px;
  14.      }
  15.      a{
  16.          text-decoration:none;
  17.      }
  18.      div.wrap{
  19.          width:%;
  20.          margin: auto;
  21.      }
  22.      table.list{
  23.          background-color: black;
  24.          width:%;
  25.      }
  26.      table.list td,table.list th{
  27.          background-color: white;
  28.          width:%;
  29.          line-height: 2em;
  30.      }
  31.      .hidden{
  32.          display:none;
  33.      }
  34.      .center{
  35.          text-align: center;
  36.      }
  37.      .orange{
  38.          color:orange;
  39.      }
  40.      a:hover{
  41.          color:blue;
  42.          font-weight: bold;
  43.      }
  44.  </style>
  45.  </head>
  46.  <body>
  47.      <div class="wrap">
  48.          <div class="list">
  49.              <h1 class="center">表格插件</h1>
  50.              <p class="orange">支持增行、删行</p>
  51.              <table class="list" >
  52.                  <thead>
  53.                  <tr>
  54.                      <th>序号</th>
  55.                      <th>姓名</th>
  56.                      <th>成绩</th>
  57.                      <th><a href="#" class="add">增行</a></th>
  58.                      <th></th>
  59.                  </tr>
  60.                  </thead>
  61.                  <tbody>
  62.                  <tr class="trmodle hidden">
  63.                      <td class="center"></td>
  64.                      <td>
  65.                          <select name="" id="">
  66.                              <option value="">张三</option>
  67.                              <option value="">李四</option>
  68.                              <option value="">王五</option>
  69.                              <option value="">赵五</option>
  70.                          </select>
  71.                      </td>
  72.                      <td><input type="text" value="" /></td>
  73.                      <td class="center"><a href="#" class="add">增行</a></td>
  74.                      <td class="center"><a href="#" class="del">删行</a></td>
  75.                  </tr>
  76.                  </tbody>
  77.              </table>
  78.          </div>
  79.      </div>
  80.  </body>
  81.  <script type="text/javascript">
  82.      $(function(){
  83.          //使用事件委托：解决新增元素事件绑定问题
  84.          $("table.list").on("click",function(e){
  85.              //console.log(e);
  86.              var v = e.target||srcElement;
  87.              if(v.nodeName.toLowerCase()=="a"){
  88.                  //增行
  89.                  if(v.className=="add"){
  90.                      //复制模板行数据
  91.                      var n = "<tr>"+$(".trmodle").eq().clone().html()+"</tr>";
  92.                      //找到父级元素中的tr，然后在后面增加增行
  93.                      $(v).parent().parent().after(n);
  94.                      setIndex();
  95.                  }
  96.                  //删行
  97.                  if(v.className=="del"){
  98.                      $(v).parent().parent().remove();
  99.                      setIndex();
  100.                  }
  101.              }
  102.          });
  103.      });
  104.      //组织序号
  105.      function setIndex() {
  106.          var t = $("table.list tr");
  107.          t.each(function () {
  108.              $(this).children("td").eq().text($(this).index());
  109.          })
  110.      }
  111.  </script>
  112.  </html>

效果图：

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" alt="" />

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