<router-link to="/login">{{ $store.state.userName }}</router-link><router-link to="/login">{{ store.state.userName }}</router-link><router-link to="/login">{{ this.store.state.userName }}</router-link><router-link to="/login">{{ this.$store.state.userName }}</router-link>一直搞不清楚 vuex 中 store 和 $store 的區(qū)別，也不知道什么時(shí)候前面應(yīng)該加this,求大神告知?！?thanks in advance