提供示例的$ destroy事件的示例？这里是从
http://docs.angularjs.org/api/ng.$rootScope.Scope#$destroy的参考文档
$destroy()
Removes the current scope (and all of its children) from the parent
scope. Removal implies that calls to $digest() will no longer
propagate to the current scope and its children. Removal also implies
that the current scope is eligible for garbage collection.The $destroy() is usually used by directives such as ngRepeat for
managing the unrolling of the loop.Just before a scope is destroyed a $destroy event is broadcasted on
this scope. Application code can register a $destroy event handler
that will give it chance to perform any necessary cleanup.
演示：
http://jsfiddle.net/sunnycpp/u4vjR/2/
原文链接：https://www.f2er.com/angularjs/146405.html这里我创建了handle-destroy指令。
ctrl.directive('handleDestroy',function() {
return function(scope,tElement,attributes) {
scope.$on('$destroy',function() {
alert("In destroy of:" + scope.todo.text);
});
};
});
