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

示例参考 - ES5

<script>
  function Teacher() {
    this.fullAttendence = true;
  }

  function LeaveCommand(teacher) {
    this.teacher = teacher;
  }

  LeaveCommand.prototype.do = function () {
    this.teacher.fullAttendence = false;

    console.log('请假成功');
    console.log('重新安排课程...');
    // ...
  }

  LeaveCommand.prototype.undo = function () {
    this.teacher.fullAttendence = true;

    console.log('撤销请假');
    console.log('恢复课程...');
    // ...
  }

  var whh = new Teacher();
  var leave = new LeaveCommand(whh);

  console.log(whh);

  leave.do();
  console.log(whh);

  leave.undo();
  console.log(whh);
</script>

示例参考 - ES6

<script>
  class Teacher {
    constructor() {
      this.fullAttendence = true;
    }
  }

  class LeaveCommand {
    constructor(teacher) {
      this.teacher = teacher;
    }

    do() {
      this.teacher.fullAttendence = false;

      console.log('请假成功');
      console.log('重新安排课程...');
      // ...
    }

    undo() {
      this.teacher.fullAttendence = true;

      console.log('撤销请假');
      console.log('恢复课程...');
      // ...
    }
  }

  var whh = new Teacher();
  var leave = new LeaveCommand(whh);

  console.log(whh);

  leave.do();
  console.log(whh);

  leave.undo();
  console.log(whh);
</script>
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