效果：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="app">
<p>{{ count }}</p>
<p>
<button @click="increment">+</button>
<button @click="decrement">-</button>
</p>
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.7/vue.min.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/vuex/3.2.0/vuex.min.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/vuex-persistedstate/3.2.0/vuex-persistedstate.umd.min.js"></script>
<script>
const store = new Vuex.Store({
state: {
count: 0
},
plugins: [createPersistedState()],
mutations: {
increment: state => state.count++,
decrement: state => state.count--
}
});
new Vue({
el: '#app',
computed: {
count() {
return store.state.count;
}
},
methods: {
increment() {
store.commit('increment');
},
decrement() {
store.commit('decrement');
}
}
});
</script>
</body>
</html>
