1

判断文件上传类型

var testmsg = file.name.substring(file.name.lastIndexOf(".") + 1);
      const extension = testmsg === "xls";
      const extension2 = testmsg === "xlsx";
      const isLt2M = file.size / 1024 / 1024 < 5;
      if (!extension && !extension2) {
        this.$message({
          message: "上传文件只能是 xls、xlsx格式!",
          type: "warning",
        });
      }
      if (!isLt2M) {
        this.$message({
          message: "上传文件大小不能超过 5MB!",
          type: "warning",
        });
      }
      // return extension || extension2 && isLt2M
      return extension || extension2;