$ scope函数未定义（匿名函数）

I have this code:

我有这个代码：

  $scope.startTimer = function (){
    $scope.settings.showMinutes = false;
    $scope.settings.showStart = false;
    $scope.settings.showPause = true;
    $scope.settings.showReset = true;
    $scope.settings.showDonate = false;
    if ($scope.settings.seconds <= 0) {
      $scope.settings.seconds = 59;
      $scope.settings.minutes -= 1;
      if ($scope.settings.minutes < 0) {
        $scope.settings.showPause = false;
        $scope.settings.stopTimer = true;
        return;
      }
      setTimeout('startTimer()', 1000);
    } else {
      $scope.settings.seconds -= 1;
      setTimeout('startTimer()', 1000);
    }
  }
  $scope.startTim