jQuery表格删除功能

html文件：
<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style>
    * {
      padding: 0;
      margin: 0;
    }
    
    .wrap {
       410px;
      margin: 100px auto 0;
    }
    
    table {
      border-collapse: collapse;
      border-spacing: 0;
      border: 1px solid #c0c0c0;
    }
    
    th,
    td {
      border: 1px solid #d0d0d0;
      color: #404060;
      padding: 10px;
    }
    
    th {
      background-color: #09c;
      font: bold 16px "Î¢ÈíÑÅºÚ";
      color: #fff;
    }
    
    td {
      font: 14px "Î¢ÈíÑÅºÚ";
    }
    
    td a.get {
      text-decoration: none;
    }
    
    a.del:hover {
      text-decoration: underline;
    }
    
    tbody tr {
      background-color: #f0f0f0;
    }
    
    tbody tr:hover {
      cursor: pointer;
      background-color: #fafafa;
    }
    
    .btnAdd {
       110px;
      height: 30px;
      font-size: 20px;
      font-weight: bold;
    }
    
    .form-item {
      height: 100%;
      position: relative;
      padding-left: 100px;
      padding-right: 20px;
      margin-bottom: 34px;
      line-height: 36px;
    }
    
    .form-item > .lb {
      position: absolute;
      left: 0;
      top: 0;
      display: block;
       100px;
      text-align: right;
    }
    
    .form-item > .txt {
       300px;
      height: 32px;
    }
    
    .mask {
      position: absolute;
      top: 0px;
      left: 0px;
       100%;
      height: 100%;
      background: #000;
      opacity: 0.15;
      display: none;
    }
    
    .form-add {
      position: fixed;
      top: 30%;
      left: 50%;
      margin-left: -197px;
      padding-bottom: 20px;
      background: #fff;
      display: none;
    }
    
    .form-add-title {
      background-color: #f7f7f7;
      border- 1px 1px 0 1px;
      border-bottom: 0;
      margin-bottom: 15px;
      position: relative;
    }
    
    .form-add-title span {
       auto;
      height: 18px;
      font-size: 16px;
      font-family: ËÎÌå;
      font-weight: bold;
      color: rgb(102, 102, 102);
      text-indent: 12px;
      padding: 8px 0px 10px;
      margin-right: 10px;
      display: block;
      overflow: hidden;
      text-align: left;
    }
    
    .form-add-title div {
       16px;
      height: 20px;
      position: absolute;
      right: 10px;
      top: 6px;
      font-size: 30px;
      line-height: 16px;
      cursor: pointer;
    }
    
    .form-submit {
      text-align: center;
    }
    
    .form-submit input {
       170px;
      height: 32px;
    }
  </style>


</head>

<body>
<div class="wrap">
  <input type="button" value="清空内容" id="btn">
  <input type="button" value="添加" id="btnAdd">
  <table>
    <thead>
    <tr>
      <th>课程名称</th>
      <th>所属学院</th>
      <th>操作</th>
    </tr>
    </thead>
    <tbody id="j_tb">
    <tr>
      <!-- <td><input type="checkbox"/></td> -->
      <td>JavaScript</td>
      <td>前端与移动开发学院</td>
      <td><a href="javascrip:;" class="get">DELETE</a></td>
    </tr>
    <tr>
      <!-- <td><input type="checkbox"/></td> -->
      <td>css</td>
      <td>前端与移动开发学院</td>
      <td><a href="javascrip:;" class="get">DELETE</a></td>
    </tr>
    <tr>
      <!-- <td><input type="checkbox"/></td> -->
      <td>html</td>
      <td>前端与移动开发学院</td>
      <td><a href="javascrip:;" class="get">DELETE</a></td>
    </tr>
    <tr>
      <td>jQuery</td>
      <td>前端与移动开发学院</td>
      <td><a href="javascrip:;" class="get">DELETE</a></td>
    </tr>
    </tbody>
  </table>
</div>

<script src="jquery-1.12.4.js"></script>
<script>
  //清空内容
  $("#btn").click(function(){
    $("#j_tb").empty();
  })
  //删除内容
  $("#j_tb").on("click", ".get",function(){
    $(this).parent().parent().remove();
  })
  //添加内容
  $("#btnAdd").click(function(){
    $('<tr><td>jQuery</td><td>前端与移动开发学院</td><td><a href="javascrip:;" class="get">DELETE</a></td></tr>').appendTo('#j_tb');
  })
</script>


</body>

</html>