Promise的优化方法

公共请求的promsie的封装

export function getJseKey ({value = '' } = {}) {
  return new Promise((resolve, reject) => {
    getEncryptKey().then(res => {
      let pubKey = res.data && res.data.pub_key
      const jse = new JSEncrypt()
      jse.setPublicKey(`-----BEGIN PUBLIC KEY-----` +
      pubKey +
      `-----END PUBLIC KEY-----`)
      let key = jse.encrypt(value)
      resolve(key)
    }).catch(err => {
      reject(err)
    })
  })
}

原先代码

---- 公共请求的promise的封装 前
getEncryptKey().then(res => {
      return res.data.pub_key
  }).then(pubKey => {
      // 通过公钥加密密码
      let { key } = this.setKey({ pubKey, value: this.data.password })
----  
      // 请求登录接口
      let params = {
        account: this.data.phoneNum,
        password: key
      }
      return signInByPassowrd(params)
     }).then(res => {
      token = res.token
      isNewUser = res.data.is_new_user
      userModel = res.data
      wx.setStorageSync('token', token)
      // isNewUser = true
      return utils.getWxcode()
    }).then(res => {
      // 获取openid
      return fetchOpenId({ js_code: res.code })
    }).then(res => {
      userModel.openid = res.data.openid
      if (isNewUser) {
        // 临时存储
        app.globalData.token = token
        app.globalData.userModel = userModel
        callback(token, isNewUser)
      } else {
        wx.setStorageSync('userModel', userModel)
        callback(token, isNewUser)
      }
    }).catch(err => {
      console.log("登录接口-报错", err)
      wx.hideLoading()
      wx.showToast({
        title: err && err.msg ? err.msg : '登录接口出错',
        icon: 'none',
        duration: 2000
      })
    })

现在的代码

-----  公共请求的promise的封装 后
getJseKey({ value: this.data.password }).then(passwordKey => {
      // 请求登录接口
      let params = {
        account: this.data.phoneNum,
        password: passwordKey
      }
-----
      return signInByPassowrd(params)
    }).then(res => {
      token = res.token
      isNewUser = res.data.is_new_user
      userModel = res.data
      wx.setStorageSync('token', token)
      // isNewUser = true
      return utils.getWxcode()
    }).then(res => {
      // 获取openid
      return fetchOpenId({ js_code: res.code })
    }).then(res => {
      userModel.openid = res.data.openid
      if (isNewUser) {
        // 临时存储
        app.globalData.token = token
        app.globalData.userModel = userModel
        callback(token, isNewUser)
      } else {
        wx.setStorageSync('userModel', userModel)
        callback(token, isNewUser)
      }
    }).catch(err => {
      console.log("登录接口-报错", err)
      wx.hideLoading()
      wx.showToast({
        title: err && err.msg ? err.msg : '登录接口出错',
        icon: 'none',
        duration: 2000
      })
    })