下载后台返回的文件

this.axios({
            url:this.common.getApi() + '/sys/api/project/downloadSample',
            method:'get',
            params: {
              id: Number(this.editform.id),
              type: Number(this.editform.type)
            },
            responseType: 'blob',
          }).then((res) => {
            let data = res.data
            const blob = data
            console.log();
              var fileName = ''
            if(that.editform.type === '0'){
               fileName = this.editform.id+'-抽样全导出.csv'
            }else{
             fileName = this.editform.id+'-参加者导出.csv'
            }
            const elink = document.createElement('a')//创建一个元素
            elink.download = fileName //设置文件下载名
            elink.style.display = 'none' //隐藏元素
            elink.href = URL.createObjectURL(blob)//元素添加href
            document.body.appendChild(elink)//元素放入body中
            elink.click()//元素点击实现
            URL.revokeObjectURL(elink.href) // 释放URL 对象
            document.body.removeChild(elink)
            this.editform.type = ''
            this.dialogVisible = false
          })