上传文件功能

通过form表单与input来实现上传功能，type=file实现上传框，enctipart确认数据格式，method确实请求方式，触发函数new formData()实例，将需要传的参数通过append方法加入formdata实例中，最后发送数据。

                <form id="upload" enctype="multipart/form-data" method="post">

                  <input type="file" name="file" id="pic" />

                  <input type="button" value="提交" @click="uploadPic()" />

                  <span class="showUrl"></span>

                  <img src="" class="showPic" alt="" />

                </form>

async uploadPic() {

      var form = document.getElementById("upload");

      var formData = new FormData(form);

      formData.append("testPort", this.adform.testPort);

      formData.append("accessInterface", this.adform.accessInterface);

      formData.append("powerInterface", this.adform.powerInterface);

      formData.append("cpu", this.adform.cpu);

      formData.append("memory", this.adform.memory);

      formData.append("clockStatus", this.adform.clockStatus);

      formData.append("ipAddress", this.adform.ipAddress);

      formData.append("version", this.adform.version);

      formData.append("fileName", this.adform.fileName);

      console.log("formdata", formData);

      const { data: res } = await this.$http.post(

        "probeEquManagement/addProbe",

        formData

      );

      console.log("上传res", res);

      if (res.code !== 200) {

        this.$message.error(res.message);

      }

      if (res.code == 200) {

        this.$message.success(res.message);

        this.alldle();

        this.getlist();

      }

    },