vue--http请求的封装--session

export function Fecth (url, data, file, _method) {
  if (file) {
    // 需要上传文件
    return new Promise((resolve, reject) => {
      axios({
        url: url,
        data: data,
        headers: {
          'Content-Type': 'multipart/form-data'
        },
        method: 'POST',
        withCredentials: true
      }).then(response => {
        resolve(response)
      })
    .catch(error => {
      reject(error)
    })
    })
  } else {
    // 不需要上传文件
    return new Promise((resolve, reject) => {
      axios({
        url: url,
        data: data,
        transformRequest: [function (data) {
          let ret = ''
          for (let it in data) {
            if ((typeof data[it]) === 'object') {
              ret += encodeURIComponent(it) + '=' + encodeURIComponent(JSON.stringify(data[it])) + '&'
            } else {
              ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[it]) + '&'
            }
          }
          return ret
                // let ret = qs.stringify(data)
                // return ret
        }],
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded'
        },
        method: _method || 'POST'
      }).then(response => {
        resolve(response)
      }
  )
    .catch(error => {
      reject(error)
    }
  )
    })
  }
}