$watch方法

var firstController = function ($scope){
    $scope.name='张三';
    $scope.data={
        name:'李四',
        count:20
    }
    $scope.count=0;
    $scope.$watch('name',function (newValue,oldValue) {
       ++$scope.count;
       if($scope.count>30){
           $scope.name='已经大于30次';
       }
        
    });
    $scope.$watch('data',function () {


    },true)



}