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