AngularJS停止定时器

1、问题背景

设置一个定时器，给定两个变量startData和endData，计时开始后分别减去5和50；单击停止暂停定时器，重置后数据恢复到原来的数据。

2、实现源码

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>AngularJS停止定时器</title>
		<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
		<script>
			var app = angular.module("intervalApp",[]);
			app.controller("intervalController",["$scope","$interval",function($scope,$interval){
				$scope.startData = 100;
				$scope.endData = 1000;
				
				var stopEvent;
				
				$scope.startEvent = function(){
					if(angular.isDefined(stopEvent)) return;
					
					stopEvent = $interval(function(){
						if($scope.startData > 50 && $scope.endData > 500)
						{
							$scope.startData = $scope.startData - 5;
							$scope.endData = $scope.endData - 50;
						}
						else
						{
							$scope.stopClick();
						}
					},1000)
				};
				
				$scope.stopClick = function(){
					if(angular.isDefined(stopEvent))
					{
						$interval.cancel(stopEvent);
						stopEvent = undefined;
					}
				};
				
				$scope.resetEvent = function(){
					$scope.startData = 100;
					$scope.endData = 1000;
				};
				
				$scope.$on("$destory",function(){
					$scope.stopClick();
				});
			}]);
		</script>
	</head>
	<body ng-app="intervalApp">
		<div ng-controller="intervalController">
			<button data-ng-click="startEvent()">开始</button>
			<button data-ng-click="stopClick()">停止</button>
			<button data-ng-click="resetEvent()">重置</button><br>
			<div>开始数据：{{startData}}</div><br>
			<div>结束数据：{{endData}}</div><br>
		</div>
	</body>
</html>

3、实现结果

（1）初始化

（2）点击开始

（3）点击停止

（4）点击重置