html & angularJS-一个简单的10s倒计时

<!-- Countdown -->
 <div style="margin: 30px auto; width: 45px; height: 45px; border: 3px solid gray; border-radius: 30px; text-align: center; line-height: 42px; vertical-align: middle; color: blue;">
            {{countdown}}
</div>

$scope.countdown = 10;
var myTime = setInterval(function() {
                                 $scope.countdown--;
                                 $scope.$digest(); // 通知视图模型的变化
                                 }, 1000);

// 倒计时10-0秒，但算上0的话就是11s
setTimeout(function() {
               　　// Do SomeThing

                   clearInterval(myTime);
                   $scope.countdown.$destroy();
}, 11000);