vue-router的项目中不同vue实例如何操作互相的数据

路由配置
entry.js

router.map({
        '/form': {
            component: function(resolve) {
                require(['./views/form'], function(form) {
                    resolve(form);
                })
            }
        },
        '/grid': {
            component: function (resolve) {
                require(['./views/grid'], function(grid) {
                    resolve(grid);
                })
            }
        },
        ...

./view/form.js

var $http = require('../vendors/rest.js');
var Form = Vue.extend({
    template: require('../template/form.html'),
    data: function (transition) {
    },
    computed: {

    },
    methods: {
        submit: function() {
            // 这里怎么操作Grid component的data？
        }
    },
    route:  {
        activate: function (transition) {
            transition.next()
        },
        deactivate: function (transition) {
            console.log('hook-example deactivated!')
            transition.next()
        }
    }

});
module.exports = Form;

如何在form对应的component的method中操作grid component的data? 两者并不存在父子关系。

---

之前有答过：
https://.com/q/1010000004002...

但是如果用vuex最方便了