出现这种报错是因为uniapp对axios有适配问题，不兼容，需要在main.js或者封装axios的文件中加以下代码

axios.defaults.adapter = function(config) {
  return new Promise((resolve, reject) => {
      console.log(config)
      var settle = require('axios/lib/core/settle');
      var buildURL = require('axios/lib/helpers/buildURL');
      uni.request({
          method: config.method.toUpperCase(),
          url: config.baseURL + buildURL(config.url, config.params, config.paramsSerializer),
          header: config.headers,
          data: config.data,
          dataType: config.dataType,
          responseType: config.responseType,
          sslVerify: config.sslVerify,
          complete: function complete(response) {
              response = {
                  data: response.data,
                  status: response.statusCode,
                  errMsg: response.errMsg,
                  header: response.header,
                  config: config
              };

              settle(resolve, reject, response);
          }
      })
  })
}