用nodejs的koa框架写的一个请求微信接口获取用户openid的示例
# 代码
github地址:https://github.com/xuedingmiaojun/koa-wx-auth-demo
app.js主程序代码
代码语言：javascript复制const Koa = require('koa')
const app = new Koa()
const Router = require('koa-router')
const router = new Router()
const request = require('request')
const bodyParser = require('koa-bodyparser')
const config = require('./config.js')
app.use(bodyParser())
// 全局异常处理
app.use(async (ctx, next) => {
try {
await next()
} catch (err) {
ctx.body = {
code: -1,
data: ctx.data,
message: ctx.msg || err.message || '服务开小差了，请稍后再试',
etime: Date.now()
}
}
})
// pretty json result
app.use(async (ctx, next) => {
await next()
ctx.set('Content-Type', 'application/json')
ctx.body = {
code: ctx.code || 0,
data: ctx.data,
message: ctx.msg || 'success',
etime: Date.now()
}
})
router.get('/', async (ctx, next) => {
ctx.data = 'api'
await next()
})
// 根据code获取用户openid
router.post('/openid', async (ctx, next) => {
try {
let grant_type = 'authorization_code'
let appid = config.appId
let secret = config.appSecret
let code = ctx.request.body.code
console.log('req code: ', code)
let opts = {
url:
'https://api.weixin.qq.com/sns/oauth2/access_token?appid='
appid
'&secret='
secret
'&code='
code
'&grant_type='
grant_type
}
let res = await promiseReq(opts)
res = JSON.parse(res)
let openid = res.openid
ctx.data = { openid: openid }
} catch (e) {
console.log(e)
}
await next()
})
app.use(router.routes())
app.use(router.allowedMethods())
let server = app.listen(3000, function() {
let host = server.address().address
let port = server.address().port
console.log('应用实例，访问地址为 http://localhost:%s', port)
})
function promiseReq(opts = {}) {
return new Promise((resolve, reject) => {
request(opts, (e, r, d) => {
if (e) {
return reject(e)
}
if (r.statusCode != 200) {
return reject(`back statusCode：${r.statusCode}`)
}
return resolve(d)
})
})
}config.js写入自己公众号的appid及secrect
代码语言：javascript复制module.exports = {
appId: '',
appSecret: ''
}# 使用
npm install进行安装，使用node app.js启动 程序默认使用3000端口 网页授权拿到code后post请求接口
- 自己的服务器IP:3000/openid
- 参数: {code:获取的code}
即可返回openid
代码语言：javascript复制{
"code": 0,
"data": {
"openid": "oRQ0bs1PCM0_BycxvU7H05DIGCX0"
},
"message": "success",
"etime": 1589925360050
}
