vue+axios下载文件的实现

HTML代码： <el-button size="medium" @click="download">下载表格</el-button>

js代码：

<script>

　 import fileDownload from 'js-file-download' //下载js-file-download：npm install js-file-download

methods: {
    //下载表格
    downloadHttpRequest(u, json, success, fail) {
      this.$http({
        method: "post",
        url: u,
        data: json,
        headers: {
          "Content-type": "application/json",
          "Access-Control-Allow-Methods": "*",
          "Access-Control-Allow-Origin": "*",
          "Access-Control-Allow-Headers": ["x-requested-with", "content-type"]
        },
        responseType: "blob"
      })
        .then(res => 
        {
            let resBlob = res.data // <--- store the blob if it is
            let resData = null
            let filename = 'attach.txt';  //给下载文件命名
            try {
            let resText =  new Promise((resolve, reject) => {
                let reader = new FileReader()
                reader.addEventListener('abort', reject)
                reader.addEventListener('error', reject)
                reader.addEventListener('loadend', () => {
                resolve(reader.result)
                })
                reader.readAsText(resBlob)
            })
            resData = JSON.parse(resText) // <--- try to parse as json evantually
            } catch (err) {
            // ignore
            }
            if (resData) {
                if (resData.error) {
                    // handle error
                } else {
                    // handle data
                }
            } else {
            // handle blob
            fileDownload(resBlob, filename)
            }
        });
    },
    download() {
      let _this = this;
      //下载表格接口/passport/getPassportNumberAndCode
      _this.downloadHttpRequest(
        "/ARPassport/passport/getPassportNumberAndCode",
        {
          code: 0,
          data: _this.$route.query.id
        },
        function success(res) {
        },
        function fail(err) {
        }
      );
    }
}    
</script>

此方法参考了网上的资料