thinkphp5 + ajax 使用formdata提交数据（包括文件上传

{

'key':"value"

}

{"state":"1","msg":"\u7b80\u5386\u6295\u9012\u6210\u529f\uff01"}

$.ajax({

})

 <form class="am-form" id="recruitinfo">

        <div class="col-lg6 col-md-6 col-xs-12 m1rem">
          <label>姓名</label>
          <input type="text" name="post[name]" id="name" required >
        </div>

        <div class="col-lg6 col-md-6 col-xs-12 m1rem">
          <label>手机号</label>
          <input type="text" name="post[iphone]" id="iphone" required>
        </div>

        <div class="col-lg10 col-md-10 col-xs-12 m2rem">

          <label>附件简历：（您的详细信息请都写在简历上,只接受word文档）</label>

          <div class="am-form-group am-form-file">
            <button type="button" class="am-btn am-btn-danger am-btn-sm">
              <i class="am-icon-cloud-upload"></i> 选择要上传的简历</button>
            <input id="doc-form-file" type="file"  name="doc" >
          </div>
          <div id="file-list"></div>
          <script>
            $(function() {
              $('#doc-form-file').on('change', function() {
                var fileNames = '';
                $.each(this.files, function() {
                  fileNames += '<span class="am-badge">' + this.name + '</span> ';
                });
                $('#file-list').html(fileNames);
              });
            });
          </script>

          <input type="hidden"  name="post[jobname]" id="jobname"  value="{$data.job}">
          <input type="hidden"  name="post[jobnameid]" id="jobnameid" value="{$data.id}">


        </div>

        <div class="col-lg-6 col-md-6 col-xs-12">
          <button type="submit" class="am-btn am-btn-primary" onclick="submitform()">提交</button>
          <a href="javascript:window.history.back(-1);" rel="external nofollow" class="am-btn am-btn-default">返回</a>
        </div>

      </form>

 <script type="text/javascript">
        function submitform() {

          event.preventDefault();
          var form =document.getElementById('recruitinfo'),
            formdata = new FormData(form);


          var url = '{:url("recruitinfo/postfrom")}';


          $.ajax({
            url:url,
            type:'post',
            data:formdata,
            dataType:'json',
            processData:false,
            contentType:false,
            success:function (res) {
              console.log('请求成功！')
              console.log(res)
            },
            error:function (XMLHttpRequest, textStatus, errorThrown) {
              console.log('出错啦！')
              console.log(XMLHttpRequest);
              console.log(textStatus);
              console.log(errorThrown);
            }
          })

        }
      </script>