待提交的表单

 <form id="updatePublicKey" enctype="multipart/form-data">

  <div class="left">

    <ul>

      <li>

        <div class="label">邮箱</div>

        <div class="ui corner labeled disabled input">

          <input type="text" disabled="disabled" value="${user.email}" placeholder="Required Field" />

        </div>

      </li>

      <li>

        <div class="label">用户名</div>

        <div class="ui corner labeled disabled input">

          <input type="text" disabled="disabled" value="${user.username}" placeholder="Required Field" />

        </div>

      </li>

      <li>

        <div class="label">

        <span>*</span>Sudo密码</div>

        <div class="ui corner labeled input">

          <input type="password" iplaceholder="" id="password" name="password" />

        </div>

        <p class="italic inputdescription">需包含字母、数字、符号,八位及以上。

        <br />Sudo密码在设备上切换到管理员用户时将使用。</p>

        <p class="red" id="sudoNo" style="display: none;">密码不符合规则</p>

      </li>

      <li>

        <div class="label">

        <span>*</span>Sudo密码确认</div>

        <div class="ui corner labeled input">

          <input type="password" placeholder="" id="passwordconfirm" name="passwordconfirm" />

        </div>

        <p class="red" id="twiceNo" style="display: none;">两次密码输入不一致</p>

      </li>

    </ul>

  </div>

  <input id="submit" type="button" class="ui teal button uploadsubmit" value="提交" style="border:0;"/>

</form>

ajax提交Form表单

$("#submit").click(function(){

			 var $form = $("#updatePublicKey");

			 var formData = new FormData($form[0]);

			 formData.append("userName", userName);//添加参数数据

             $.ajax({

                 url: updatekey_url,

                 data:formData,

                 type: 'POST',

                 cache: false,

                 contentType: false,

                 processData: false,

                 xhr: function() {

                     myXhr = $.ajaxSettings.xhr();

                     return myXhr;

                 },

                 success: function(json) {

                	 //

                	 if (json.status == 0) {

                		 location.href = publickey_index_url;

                     } else {

                   	  	alert(json.msg);

                     }

                 }

             });

	});