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<>微信小程序获取手机号登录流程
首先前端使用wx.login 获取code
wx.login({ success(res) { if (res.code) { that.setData({ code: res.code }); }
}, fail(res) { console.log('获取凭证失败!' + res); } })
在wxml文件里面的加上按钮，通过按钮触发getPhoneNumber方法，button的open-type="getPhoneNumber"加上
<button open-type="getPhoneNumber" bindgetphonenumber="getPhoneNumber">
在getPhoneNumber(e)函数里面
前端调取后端给的接口把code传过去，后端使用 code 换取 openid、unionid、session_key 等信息；
request.request('jscode2session', { code: this.data.code }, res => { if
(res.status == 1) { that.setData({ session_key:
encodeURIComponent(res.data.session_key) }); } })
记住：发送请求时前端传参如果用encodeURIComponent()转码，后端也一定要用转码，前端如果不用后端也不用，一定要前后端保持一致，不然后端拿到之后请求微信接口会报错！！！
然后通过getPhoneNumber(e)函数的e这个对象里面获取iv和encryptedData；
var iv = encodeURIComponent(e.detail.iv) var encryptedData =
encodeURIComponent(e.detail.encryptedData);
因为第一次wx.login()拿到的code为了获取session_key已经使用过了，所以后端获取手机号所需的code需要再次通过wx.login()获取一下；
至此后端通过微信获取手机号所需要的四个参数都已经凑齐wx_code、session_key、encryptedData、iv；
wx.login({ success(res) { if (res.code) { // 成功回调获取用户解密手机号
request.request('login', { wx_code: res.code, session_key:
that.data.session_key, encryptedData: encryptedData, iv: iv }, res => {
console.log('打印后端返回的值') }, fail => {}) } } })
至此微信小程序获取手机号前后端交互完成!!!
