Angular中Controller之间的信息传递，第二种办法：$emit,$broadcast,$on

• $emit只能向parent controller传递event与data( $emit(name, args) )
• $broadcast只能向child controller传递event与data( $broadcast(name, args) )
• $on用于接收event与data( $on(name, listener) )

<div ng-controller="ParentCtrl">              <!--父级-->
  <div ng-controller="SelfCtrl">              <!--自己-->
    <a ng-click="click()">click me</a>
    <div ng-controller="ChildCtrl"></div>     <!--子级-->
  </div>
  <div ng-controller="BroCtrl"></div>         <!--平级-->
</div>

JS：

var app = angular.module('myApp', []);
app.controller('SelfCtrl', function($scope) {
  $scope.click = function () {
    $scope.$broadcast('to-child', 'child');
    $scope.$emit('to-parent', 'parent');
  }
});
 
app.controller('ParentCtrl', function($scope) {
  $scope.$on('to-parent', function(event,data) {
    console.log('ParentCtrl', data);       //父级能得到值
  });
  $scope.$on('to-child', function(event,data) {
    console.log('ParentCtrl', data);       //子级得不到值
  });
});
 
app.controller('ChildCtrl', function($scope){
  $scope.$on('to-child', function(event,data) {
    console.log('ChildCtrl', data);      //子级能得到值
  });
  $scope.$on('to-parent', function(event,data) {
    console.log('ChildCtrl', data);      //父级得不到值
  });
});
 
app.controller('BroCtrl', function($scope){
  $scope.$on('to-parent', function(event,data) {
    console.log('BroCtrl', data);         //平级得不到值
  });
  $scope.$on('to-child', function(event,data) {
    console.log('BroCtrl', data);         //平级得不到值
  });
});

点击click运行结果：

ChildCtrl child controller.

ParentCtrl parent

在$on的方法中的event事件参数，其对象的属性和方法如下