[: currentTime | date:'mm:ss' :] [: timeLeft | date:'mm:ss' :]

示例参考 - ES6

<script>
  class User {
    notify(msg) {
      console.log('新消息：' + msg);
    }
  }

  class Department {
    constructor() {
      this.subs = [];
    }

    subscribe(user) {
      this.subs.push(user);
    }

    newMessage(msg) {
      this.subs.forEach(user => {
        user.notify(msg);
      });
    }
  }

  let a = new Department;
  let a1 = new User;
  let a2 = new User;
  let a3 = new User;

  let b = new Department;
  let b1 = new User;
  let b2 = new User;

  let ab1 = new User;

  a.subscribe(a1);
  a.subscribe(a2);
  a.subscribe(a3);
  a.subscribe(ab1);
  a.newMessage('Yo, from a.');

  b.subscribe(b1);
  b.subscribe(b2);
  b.subscribe(ab1);
  b.newMessage('Yo, from b.');
</script>

示例参考 - ES5

<script>
  function User () {}

  User.prototype.notify = function (msg) {
    console.log('新消息：' + msg)
  }

  function Department () {
    this.subs = []
  }

  Department.prototype.subscribe = function (user) {
    this.subs.push(user)
  }

  Department.prototype.newMessage = function (msg) {
    this.subs.forEach(user => {
      user.notify(msg)
    })
  }

  var a  = new Department
  var a1 = new User
  var a2 = new User
  var a3 = new User

  var b  = new Department
  var b1 = new User
  var b2 = new User

  var ab1 = new User

  a.subscribe(a1)
  a.subscribe(a2)
  a.subscribe(a3)
  a.subscribe(ab1)
  a.newMessage('Yo, from a.')

  b.subscribe(b1)
  b.subscribe(b2)
  b.subscribe(ab1)
  b.newMessage('Yo, from b.')
</script>
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