axios({
    method: 'post',
    url: '/api/login',
    data: {
        username,
        pwd
    }})

let param = new URLSearchParams()param.append('username', 'admin')param.append('pwd', 'admin')
axios({
    method: 'post',
    url: '/api/login',
    data: param
})

import Qs from 'qs'let data = {
    "username": "admin",
    "pwd": "admin"
}axios({
    headers: {
        'deviceCode': 'A95ZEF1-47B5-AC90BF3'
    },
    method: 'post',
    url: '/api/login',
    data: Qs.stringify(data)
})

import Qs from 'qs'axios({
    url: '/api/login',
    method: 'post',
    transformRequest: [function(data){       
         // 对 data 进行任意转换处理        
        return Qs.stringify(data)
    }],
    headers: {
        'deviceCode': 'A95ZEF1-47B5-AC90BF3'    },
    data: {
        username: 'admin',
        pwd: 'admin'    }
})

import axios from 'axios'let instance = axios.create({
    transformRequest: [function transformRequest(data, headers) {
        normalizeHeaderName(headers, 'Content-Type');
        if (utils.isFormData(data) ||          utils.isArrayBuffer(data) ||          utils.isBuffer(data) ||          utils.isStream(data) ||          utils.isFile(data) ||          utils.isBlob(data)
        ) {
          return data;
        }
        if (utils.isArrayBufferView(data)) {
          return data.buffer;
        }
        if (utils.isURLSearchParams(data)) {
          setContentTypeIfUnset(headers, 'application/x-www-form-urlencoded;charset=utf-8');
          return data.toString();
        }
        /*改了这里*/       
 if (utils.isObject(data)) {
          setContentTypeIfUnset(headers, 'application/x-www-form-urlencoded;charset=utf-8');
          let _data = Object.keys(data)
          return encodeURI(_data.map(name => `${name}=${data[name]}`).join('&'));
        }
        return data;
    }],
})