angular apply

<div ng-controller="firstController">
  
 {{date}}

</div>


<script>
    var firstController = function($scope){
        $scope.date = new Date();

      setInterval(function(){
          $scope.$apply(function(){
              $scope.date = new Date()
              //会去触发脏检查 用于自定义
          })
      },1000)
            //controller最后会自动触发脏检查
    }