angularJS随笔

1.作用域

基于作用域的事件传播

作用域可以像DOM节点一样，进行事件的传播。主要是有两个方法：

broadcasted ：从父级作用域广播至子级 scope
emitted ：从子级作用域往上发射到父级作用域

<!doctype html>
<html ng-app>
<head>
    <script src="http://code.angularjs.org/1.2.25/angular.min.js"></script>
</head>
<body>
    <div ng-controller="EventController">
        Root作用域<tt>MyEvent</tt> count:{{count}} 
        <ul>
            <li ng-repeat="i in [1]" ng-controller="EventController">
                <button ng-click="$emit('MyEvent')">$emit('MyEvent')</button>
                <button ng-click="$broadcast('MyEvent')">$broadcast('MyEvent')</button>
                <br>
                Middle作用域<tt>MyEvent</tt> count: {{count}}
                <ul>
                    <li ng-repeat="item in [1, 2]" ng-controller="EventController">
                        Leaf作用域<tt>MyEvent</tt> count: {{count}}
                    </li>
                </ul>
            </li>
        </ul>
    </div>
    <script type="text/javascript">
        function EventController($scope) {
            $scope.count = 0;
            $scope.$on('MyEvent', function() {
                $scope.count++;
            });
        }
    </script>
</body>
</html>