js下载文件

1.直接打开url地址，地址可以是绝对路径或者接口拼接的地址

location.href = url

2.接口返回文档流

axios({
      method: data.method,
      url: `${data.url}${data.params ? "?" + data.params : ""}`,
      responseType: "blob",
      data: data.data
    })
      .then(res => {
        const link = document.createElement("a");
        let blob = new Blob([res.data], { type: "application/vnd.ms-excel" });
        link.style.display = "none";
        link.href = URL.createObjectURL(blob);

        // link.download = res.headers['content-disposition'] //下载后文件名
        link.download = data.fileName; //下载的文件名
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
      })
      .catch(error => {
        this.$Notice.error({
          title: "错误",
          desc: "网络连接错误"
        });
        // console.log(error);
      });