前端下载——处理后端返回的二进制文件（乱码）

https://blog.csdn.net/heixiuheixiu666/article/details/105734283?utm_medium=distribute.pc_relevant.none-task-blog-OPENSEARCH-7.compare&depth_1-utm_source=distribute.pc_relevant.none-task-blog-OPENSEARCH-7.compare

  //导出
    excelOut() {
      this.axios
        .get(url, {
          responseType: 'blob'
        })
        .then(res => {
          let url = window.URL.createObjectURL(res)
          let a = document.createElement('a')
          document.body.appendChild(a)
          a.href = url
          const fileName = '文件名.xlsx'
          a.download = fileName
          a.click() 
          window.URL.revokeObjectURL(url) 
        })
        .catch(() => {
          this.$message.error('导出失败')
        })
    }