vue前端开发辅助函数状态管理详解示例

  //....
  computed: {
        count: function(){
            return this.$store.state.count
        }
    }
 //....    

import { mapState } from 'vuex'  //引入mapState对象 
export default {
  // ...
  computed: mapState({
    // 箭头函数可使代码更简练
    count: state => state.count,
  })
}
或者
import { mapState } from 'vuex'  //引入mapState对象 
export default {
  // ...
  computed: mapState({
    'count', //与state名称一致
     countAlias：'count' //countAlias是在引用组件中使用的别名
  })
}

import { mapGetters } from 'vuex'
export default {
  // ...
  computed: {
  // 使用对象展开运算符将 getters 混入 computed 对象中
    ...mapGetters([
      'countDouble',
      'CountDoubleAndDouble',
      //..
    ])
  }
}

import { mapMutations } from 'vuex'
export default {
  //..
  methods: {
    ...mapMutations([
      'increment' // 映射 this.increment() 为 this.$store.commit('increment')
    ]),
    ...mapMutations({
      add: 'increment' // 映射 this.add() 为 this.$store.commit('increment')
    })
  }
}

import { mapActions } from 'vuex'
export default {
  //..
  methods: {
    ...mapActions([
      'incrementN' //映射 this.incrementN() 为 this.$store.dispatch('incrementN')
    ]),
    ...mapActions({
      add: 'incrementN' //映射 this.add() 为 this.$store.dispatch('incrementN')
    })
  }
}

<template>
  <div align="center" style="background-color: bisque;">
    <p>以下是使用computed直接获取stores中的状态数据，状态数据发生变化时，同步刷新</p>
    <h1>使用computed接收 state:{{ computedState }}</h1>
    <h1>使用computed接收Getters:{{ computedGetters }}</h1>
  </div>
</template>
<script>
  import { mapState,mapGetters } from 'vuex'  //引入mapState,mapGetters对象
  export default {
    name: 'ComputeShow',
    computed:{
    ...mapState({
      computedState:'count'  //别名：computedState
    }),
    ...mapGetters({
      computedGetters:'getChangeValue' //别名：computedGetters
    })
    }
  }
</script>
<style>
</style>

<template>
  <div align="center">
    <input type="number" v-model="paramValue" />
    <button @click="addNum({res: parseInt(paramValue)})">+增加</button>
    <button @click="subNum">-减少</button>
  </div>
</template>
<script>
  import {
    mapMutations,
    mapActions
  } from 'vuex' //引入mapMutations、mapActions对象
  export default {
    name: 'CountChange',
    data() {
      return {
        paramValue: 1,
      }
    },
    methods: {
      ...mapMutations({
        subNum: 'sub'  //增加别名subNum
      }),
      ...mapActions({
        addNum: 'increment' //映射 this.incrementN() 为 this.$store.dispatch('incrementN')
      })
    }
  }
</script>
<style>
</style>