angular的下拉表单

//下拉框

<select ng-change="change()" ng-model="age" ng-init="age=ages[0]">

//添加需要的下拉框数据

$scope.ages = ["按年龄正序排序", "按年龄倒序排列"];

//排序

$scope.change = function() {
	var a1 = $scope.age;
	console.log("--" + a1);
	if (a1 == "按年龄倒序排列") {
	console.log(a1 + "----")
	$scope.persons.sort(function(a, b) {
	return b.age - a.age;
	});
	} else {
	$scope.persons.sort(function(a, b) {
	return a.age - b.age;
	});
	}
	}