angularjs 前台如何传值给后台？或者后台传前台！！求大神指点迷津

[fly-ttdd]

前台 ：
<li ng-click="$scope.getCoachsByExperience(1,3)">1-3年</li>
<li ng-click="$scope.getCoachsByExperience(3,5)">3-5年</li>
<li ng-click="$scope.getCoachsByExperience(5,10)">5-10年</li>
<li ng-click="$scope.getCoachsByExperience(10,40)">10年以上</li>
后台：

$scope.getCoachsByExperience=(a,b)->
value=[]
for coach in coachs
if coach.Experience >a and coach.Experience<=b
value.push coach
$scope.coachs=value
$scope.totalCount=data.TotalCount $scope.getCoachsByExperience(a,b)

2
报错：
ReferenceError: a is not defined

[香蕉猪]

a,b前加$试试看。。。