el-upload 手动上传文件

<el-upload
        style="display: inline"
        ref="upload"
        :show-file-list="false"
        :on-success="onSuccess"
        :on-error="onError"
        accept=".csv,.xls,.xlsx"
        :before-upload="beforeUpload"
        :on-change="handleChange"
        :auto-upload="false" //禁止文件自动上传
        action="..........">  //文件上传的后端地址
        <!-- :auto-upload="false" -->
        <el-button slot="trigger" size="small" type="primary" style="margin-top: 10px">选择文件</el-button>
        <el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传文件</el-button>
        <!--<el-button size="mini" type="success" >导入</el-button>-->
      </el-upload>

//选择文件并显示文件名/文件大小/状态 等      
handleChange(file, fileList) {
        this.oploadfileList = [];
        let size = file.size;
        if(size < 0.1 * 1024){                            //小于0.1KB，则转化成B
          size = size.toFixed(2) + "B"
        }else if(size < 0.1 * 1024 * 1024){            //小于0.1MB，则转化成KB
          size = (size/1024).toFixed(2) + "KB"
        }else if(size < 0.1 * 1024 * 1024 * 1024){        //小于0.1GB，则转化成MB
          size = (size/(1024 * 1024)).toFixed(2) + "MB"
        }else{                                            //其他转化成GB
          size = (size/(1024 * 1024 * 1024)).toFixed(2) + "GB"
        }
        let name = file.name;
        let type = name.substring(name.lastIndexOf('.')+1);//文件后缀名
        // console.log(name,size)
        this.oploadfileList.push({file_name: name, file_size: size,file_jindu: '100%',file_zhuangtai:'已上传',file_caozuo:'此不可逆操作'});
        // console.log(fileList)
        // this.fileData = new FormData()
        // var that = this
        this.fileList = fileList;
        this.fileData.append('file', file);
      },

//上传文件
      submitUpload(file, fileList) {
        this.$refs.upload.submit();
      },

//文件上传成功后
onSuccess(res, file, fileList) {
　　console.log(res)
},

　onSuccess 的 res 为 this.$refs.upload.submit();文件上传成功后，接收后端返回过来的值