为什么我的 uid 未定义答案

【问题标题】：Why I am getting uid as undefined为什么我的 uid 未定义
【发布时间】：2019-07-10 20:08:07
【问题描述】：

我正在调用 uid 进行存储，但它一直未定义有什么问题？

handleAdminSubmit(e) {
    e.preventDefault()

    const auth = firebase.auth();
    let promise = auth.createUserWithEmailAndPassword(this.state.SubEmail, this.state.subPasswrd);
    promise.then(user=> {
    console.log(user.uid)
      let email = this.state.SubEmail
      let em = email.replace('.com', '')
      let db = firebase.database();

      db.ref("Admins").child(em)
        .set({ "Admin": this.state.SubEmail, "password": this.state.subPasswrd, "Name": this.state.adminName  })
        .then(e => {
          console.log("succes")
          this.FetchAdmins()
        });


    })
    promise.catch(e => {
      alert("admin not created , Try again")
    })
  }

【问题讨论】：

标签： reactjs firebase web firebase-authentication

【解决方案1】：

传递给then 的类型是UserCredential。要获取实际用户，您必须访问其上的 user 属性。所以：

auth.createUserWithEmailAndPassword(this.state.SubEmail, this.state.subPasswrd);
    .then(credential => {
        console.log(credential.user.uid)

【讨论】：

【解决方案2】：

uid 可用于 auth 对象：

const auth = firebase.auth();
let promise = auth.createUserWithEmailAndPassword(this.state.SubEmail, this.state.subPasswrd);
promise.then(() => {
    console.log(auth.uid)
    ...

【讨论】：