jquery中添加属性和删除属性

<!DOCTYPE>
<html >
<head>
 <meta charset="utf-8" />
 <title>demo</title>
 <style type="text/css">
.control-group{
 margin-bottom: 20px;
}
.controls{
 display: inline-block;
 vertical-align: top;
}
form{
 border:1px dotted #666;
 padding: 30px;
 display: inline-block;
}
input[disabled],
select[disabled],
textarea[disabled],
input[readonly],
select[readonly],
textarea[readonly] {
 cursor: not-allowed;
}
 </style>
<body>
 <form method="post" action="" onsubmit="return false;">
  <div class="control-group">
   <label for="project_name">名称:</label>
   <input name="project_name" maxlength="20" id="project_name" placeholder="项目名称"></div>
  <div class="control-group">
   <label>类型:</label>
   <select id="project_type" onchange="typeChange()">
    <option value="" disabled="disabled"></option>
    <option value="" disabled="disabled">------  [ 类型一 ]  ------</option>
    <option value="1">选项1</option>
    <option value="2">选项2</option>
    <option value="3">选项3</option>
    <option value="" disabled="disabled"></option>
    <option value="" disabled="disabled">------  [ 类型二 ]  ------</option>
    <option value="4">选项4</option>
    <option value="5">选项5</option>
    <option value="6">选项6</option>
   </select>
  </div>
  <div class="control-group">
   <label>参数:</label>
   <div class="controls">
    <br/>
    <label class="radio" for="1arg">
     <input type="radio" name="nodes" id="1arg" value="1" checked="checked" />
     单个参数
    </label>
    <br/>
    <label class="radio" for="2args">
     <input type="radio" name="nodes" id="2args" value="2" />
     两个参数
    </label>
    <br/>
    <label class="radio" for="3args" >
     <input type="radio" name="nodes" id="3args" value="3" disabled="disabled" />
     三个参数
    </label>
   </div>
  </div>
  <div class="control-group">
   <button id="create_project" type="submit" onclick="beforecreate()">新建</button>
   <button >取消</button>
  </div>
 </form>
 <script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-2.1.4.min.js">

以上所述就是本文的全部内容了，希望大家能够喜欢。