angularjs $scope.$watch(),监听值得变化

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myApp.controller('firstController',function($scope,$interval){    $scope.date = new Date();     setInterval(function(){         $scope.$apply(function(){             $scope.date = new Date();         })     },1000)      $scope.count = 0;    $scope.$watch("date",function(newValue,oldValue){     ++$scope.count;     if($scope.count>5){      //alert("超过五次了")       }    })

　　$scope.$wach("name",function(newValue,oldValue){})