xxApi.then(res=>{
    let data =res.data;
    if (data.type == "application/json") {
      let reader = new FileReader();
       reader.readAsText(data, "utf-8");
       reader.onload = (e) => {
            let result = reader.result;
            let resObj = {};
            resObj = JSON.parse(result);
            that.$message.warning(resObj.message); // 提示接口返回的错误信息
          };
    }else{
        // 正确的处理
    }
})

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