<template>
    <div>
        <h1>当前求和为：{{ sum }}</h1>
        <h1>当前求和放大10倍为：{{ bigSum }}</h1>
        <h1>我在{{ school }}，学习{{ subject }}</h1>
        <select v-model.number="n">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select>
        <button @click="increment">+</button>
        <button @click="decrement">-</button>
        <button @click="incrementOdd">当前求和为奇数再加</button>
        <button @click="incrementWait">等一等再加</button>
    </div>
</template>

<script>
import { mapGetters, mapState } from "vuex";
export default {
    name: "Count",
    data() {
        return {
            n: 1, //用户选择的数字
        };
    },
    computed: {
        // 靠程序员自己亲自去写计算属性
        // sum(){
        //     return this.$store.state.sum
        // },
        // school(){
        //     return this.$store.state.school
        // },
        // subject(){
        //     return this.$store.state.subject
        // },

        // 借助mapState生成计算属性，从state中读取数据（对象写法）
        // ...mapState({ he: "sum", xuexiao: "school", xueke: "subject" }),

        // 借助mapState生成计算属性，从state中读取数据（数组写法）
        ...mapState(["sum", "school", "subject"]),

        /*********************************** */
        // bigSum(){
        //     return this.$store.getters.bigSum
        // }

        // 借助mapGetters生成计算属性，从state中读取数据（对象写法）
        // ...mapGetters({ bigSum: "bigSum" }),

        // 借助mapGetters生成计算属性，从state中读取数据（数组写法）
        ...mapGetters(["bigSum"]),
    },
    mounted() {
        // const x = mapState({he:'sum',xuexiao:'school',xueke:'subject'})
        // console.log(x)
    },
    methods: {
        increment() {
            // this.$store.dispatch('jia',this.n)
            this.$store.commit("JIA", this.n);
        },
        decrement() {
            // this.$store.dispatch('jian',this.n)
            this.$store.commit("JIAN", this.n);
        },
        incrementOdd() {
            this.$store.dispatch("jiaOdd", this.n);
        },
        incrementWait() {
            this.$store.dispatch("jiaWait", this.n);
        },
    },
};
</script>

<style>
button {
    margin-left: 5px;
}
</style>