Payload 　　 Content-Type: 'application/json; charset=utf-8'
Form Data　　 Content-Type: 'application/x-www-form-urlencoded'

單獨(dú)使用

axios({
   method: 'post',
   url: url,
   data: {
      username: username,
      password: password
   },
   transformRequest: [
      function (data) {
         let ret = ''
         for (let it in data) {
            ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[it]) + '&'
         }
         ret = ret.substring(0, ret.lastIndexOf('&'));
         return ret
      }
    ],
    headers: {
       'Content-Type': 'application/x-www-form-urlencoded'
    }
})

全局設(shè)置

import axios from 'axios'
import qs from 'qs'

// 實(shí)例對象
let instance = axios.create({
  timeout: 15000,
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded'
  }
})

// 請求攔截器
instance.interceptors.request.use(
  config => {
    config.data = qs.stringify(config.data) // 轉(zhuǎn)為formdata數(shù)據(jù)格式
    return config
  },
  error => Promise.error(error)
)