javascript - AngularJS $on - 重新订阅未订阅的广播

Question

要取消订阅$on中的$broadcast，可以这样做

var cleanUp = $rootScope.$on('myBroadcast', function(){ ... });
cleanUp();

调用cleanUp()后是否可以重新订阅？

Answer 1

function foo () {
  return $rootScope.$on('myBroadcast', function(){ ... });
}
var cleanup = foo(); // listen

// somewhere down the road
cleanup(); // unlisten

// somewhere down the road
foo(); // listen again