根-store.state.count: {{ store.state.count }}
A-store.state.state_a: {{ store.state.module_a.state_a }}
B-store.state.module_b.state_b: {{ store.state.module_b.state_b }}
根-store.getters.getter(3): {{ store.getters.getter(3) }}
A-store.getters.getter_a: {{ store.getters.getter_a }}
B-store.getters['module_b/getter_b']: {{ store.getters['module_b/getter_b'] }}
根-store.commit('mutation', {num: 7}):
A-store.commit('mutation_a', {num: 8}):
B-store.commit('module_b/mutation_b', {num: 9}):
根-store.dispatch('action', {num: 7}):
A-store.dispatch('action_a', {num: 8}):
B-store.dispatch('module_b/action_b', {num: 9}):