[JavaScript知识库]一个vuex的完整使用

1、图中的vuex区域步骤每一步都不可少

• 安装vuex npm install vuex --save
• 引入vue vuex 并进行挂载
• import Vue from ‘vue’
  import Vuex from ‘vuex’
  Vue.use(Vuex)

2、

3、

<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.$store.state.city}}</div>
          </div>

        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
            <div class="button">{{item.name}}</div>
          </div>

        </div>
      </div>
      <div class="area" v-for="(item , key) of cities" :key="key" :ref="key">
        <div class="title  border-topbottom">{{key}}</div>
        <div class="item-liast">
          <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id">{{innerItem.name}}</div>

        </div>

      </div>

    </div>
  </div>
</template>
<script>
import Bscroll from "better-scroll";
export default {
  name: "List",
  props: {
    hot: Array,
    cities: Object,
    letter: String,
  },
  methods: {
    handleCityClick(city) {
      // console.log(city);
      this.$store.dispatch("changeCity", city);
    },
  },

  mounted() {
    // console.log(this.scroll);
    this.scroll = new Bscroll(this.$refs.wrapper);
  },
  watch: {
    letter(e) {
      // console.log(e);
      const element = this.$refs[this.letter][0];
      this.scroll.scrollToElement(element);
      // console.log(element);
    },
  },
};
</script>
<style lang="stylus" scoped>
@import '~style/varibles.styl';

.border-topbottom {
  &:before {
    border-color: #777;
  }

  &:after {
    border-color: #777;
  }
}

.border-bottom {
  &:before {
    border-color: #777;
  }
}

.list {
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 1.58rem;
  right: 0;
  bottom: 0;
}

.button-list {
  overflow: hidden;
  padding: 0.1rem 0.6rem 0.1rem 0.1rem;
}

.button-wrapper {
  float: left;
  width: 33.33%;
}

.button {
  text-align: center;
  margin: 0.1rem;
  border: 0.02rem solid #ccc;
  padding: 0.1rem 0;
  border-radius: 0.06rem;
}

.title {
  line-height: 0.44rem;
  background-color: #eee;
  padding-left: 0.2rem;
  color: #666;
  font-size: 0.26rem;
}

.item-liast .item {
  line-height: 0.76rem;
  padding-left: 0.2rem;
}
</style>

js文件

import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    city: '北京'
  },
  actions: {
    changeCity(ctx, city) {
      // console.log(ctx);
      // console.log(city);
      ctx.commit('changeCitys', city)

    }
  },
  mutations: {
    changeCitys(state, city) {
      state.city = city
    }
  }
})