<!-- a标签占位 -->
    <a ref="down"  ></a>

 getTest() {


        this.$axios.request({

          url: 'https://cnv13.55.la/download?file_key=3695fa9461a0ae59cf3148581e4fe339&handle_type=excel2pdf',
          method: 'get',
          responseType: 'blob', // 切记类型 blob

        }).then(res => {

          const url = URL.createObjectURL(res.data)
          this.$refs.down.href = url //转化成本地url
          this.$refs.down.download = '123456.pdf'//下载的文件名字
   		  this.$refs.down.click() //点击a标签

        })