打印字符串angularjs 2-2

我的代码是：

firebase.auth().onAuthStateChanged(function(user) {
      if (user) {
        var user1 = firebase.auth().currentUser;
        var name, email, photoUrl, password, uid, emailVerified;
        if (user != null) {
          name = user1.displayName;
          email = user1.email;
          photoUrl = user1.photoURL;
          emailVerified = user1.emailVerified;
          uid = user1.uid;  // The user's ID, unique to the Firebase project. Do NOT use
          // this value to authenticate with your backend server, if
          // you have one. Use User.getToken() instead.
          console.log(email);
        }
      } else {
        console.log('no user');
      }
    });

log（email）以html格式打印电子邮件

<h1>email: {{ email }}</h1>

email:{{email}

---

什么都别给我打印，为什么？我在谷歌上搜索了一下，但什么都没有。怎么了？

要在html中打印，变量应该是类属性。 在组件类中，声明

电子邮件

@Component()
export class cmp{
email:any;
//...
//In your firebase call set in this.email
firebase.auth().onAuthStateChanged((user)=> {//use arrow function to make sure this is correct
  if (user) {
    let user1 = firebase.auth().currentUser;
    let name, photoUrl, password, uid, emailVerified;
    if (user != null) {
      name = user1.displayName;
      this.email = user1.email;//here
      photoUrl = user1.photoURL;
      emailVerified = user1.emailVerified;
      uid = user1.uid;  // The user's ID, unique to the Firebase project. Do NOT use
      // this value to authenticate with your backend server, if
      // you have one. Use User.getToken() instead.
      console.log(this.email);
    }
  } else {
    console.log('no user');
  }
});

现在，用html显示

 {{email}}

要在html中打印，变量应该是类属性。
在组件类中，声明
电子邮件

@Component()
export class cmp{
email:any;
//...
//In your firebase call set in this.email
firebase.auth().onAuthStateChanged((user)=> {//use arrow function to make sure this is correct
  if (user) {
    let user1 = firebase.auth().currentUser;
    let name, photoUrl, password, uid, emailVerified;
    if (user != null) {
      name = user1.displayName;
      this.email = user1.email;//here
      photoUrl = user1.photoURL;
      emailVerified = user1.emailVerified;
      uid = user1.uid;  // The user's ID, unique to the Firebase project. Do NOT use
      // this value to authenticate with your backend server, if
      // you have one. Use User.getToken() instead.
      console.log(this.email);
    }
  } else {
    console.log('no user');
  }
});

现在，用html显示

 {{email}}

您应该使用
let
而不是
var
。请在精彩的[typescript documentation][1][1]中找到解释：@niklas你说得对..谢谢。。但这并不是OP收到问题的真正原因。我宣布它是电子邮件：任何；我这样做了。email=user1.email但什么都没有。控制台日志打印：test1@gmail.com，但是{email}nothing在哪里调用了
firebase.auth（）.onAuthStateChanged
？您可以添加组件和html代码吗？你使用了箭头函数吗？我是新手，但它不是箭头函数，它是从Firebase导入的。你应该使用
let
而不是
var
。请在精彩的[typescript documentation][1][1]中找到解释：@niklas你说得对..谢谢。。但这并不是OP收到问题的真正原因。我宣布它是电子邮件：任何；我这样做了。email=user1.email但什么都没有。控制台日志打印：test1@gmail.com，但是{email}nothing在哪里调用了
firebase.auth（）.onAuthStateChanged
？您可以添加组件和html代码吗？你使用了箭头功能吗？我是新手，但它不是箭头功能，它是从firebase导入的