705_vuex(map映射简写)

<template>
  <div>
    <h1>当前求和为:{{ sum }}</h1>
    <h4>当前求和乘以10倍为:{{ bigSum }}</h4>
    <h4>我在{{ school }},学{{ subject }}</h4>
    <select v-model="n">
      <!-- value默认是字符串类型，加上":"后 所有冒号里面的内容变成js表达式来解析-->
      <!-- 或者使用 v-model.number="n" 强制类型转换-->
      <option :value="1">1</option>
      <option :value="2">2</option>
      <option :value="3">3</option>
    </select>
    <!-- 要事先传递参数 -->
    <button @click="increment(n)">+</button>
    <button @click="decrement(n)">-</button>
    <button @click="incrementOdd(n)">当前求和为奇数再加</button>
    <button @click="incrementWait(n)">等一等再加</button>
  </div>
</template>

<script>
import { mapState, mapGetters, mapMutations, mapActions } from "vuex";

export default {
  name: "Count",
  data() {
    return {
      n: 1, //用户选择的数字
    };
  },

  methods: {
    //借助mapMutations生成对应的方法，方法会调用commit去联系Mutations
    ...mapMutations({ increment: "JIA", decrement: "JIAN" }),

    //借助mapActations生成对应的方法，方法会调用dispatch去联系actions
    ...mapActions({ incrementOdd: "jiaOdd", incrementWait: "jiaWait" }),
  },
  computed: {
    //借助mapState生成计算属性，从state中读取数据(对象写法)
    ...mapState({ sum: "sum", school: "school", subject: "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'])

    ...mapGetters(["bigSum"]),
    // bigSum() {
    //   return this.$store.getters.bigSum;
    // },
  },
};
</script>

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