input 的监听事件 ng-change

<form ng-controller="StartUpController">
Starting : <input ng-change="computeNeeded()" ng-model="funding.startingEstimate">
Recommendation: {{funding.needed}}
</form>

function StartUpController($scope) {
        $scope.funding = { startingEstimate : 0};

        $scope.computeNeeded = function () {
            $scope.funding.needed = $scope.funding.startingEstimate * 10;
        }
    }

检测数据是否变化

$scope.$watch('funding.startingEstimate', computeNeeded);