派发器抽离vue2单组件中的大量逻辑技巧

<template>
  <div>
    <input type="text" placeholder="请输入关键字" v-model="value" /><button
      @click="handleAddTood"
    >
      操作按钮
    </button>
    <tood-list-item
      v-for="item in list"
      :key="item.id"
      :item="item"
      @handleDel="handleDel"
    ></tood-list-item>
  </div>
</template>
<script>
import ToodListItem from "./ToodListItem";
export default {
  components: {
    ToodListItem,
  },
  props: {
    list: {
      type: Array,
      default() {
        return [];
      },
    },
  },
  data() {
    return {
      value: "",
    };
  },
  methods: {
    handleDel(item) {
      this.$emit("handelDel", item);
    },
    handleAddTood() {
      this.$emit("addTood", this.value);
    },
  },
};
</script>

<template>
  <div>
    <input type="checkbox" v-model="item.complated" />
    <span
      :style="{ textDecoration: item.complated ? 'line-through' : 'none' }"
      >{{ item.title }}</span
    >
    <button @click="handleDel(item)">删除</button>
  </div>
</template>
<script>
export default {
  props: {
    item: {
      type: Object,
      default() {
        return {};
      },
    },
  },
  methods: {
    handleDel(item) {
      this.$emit("handleDel", item);
    },
  },
};
</script>

//主要定义时间触发的类型常量
export const ACTION_TYPES = {
  del: "DEL",
  add: "ADD",
};

//派发器，通过action找到对应的事件处理逻辑，然后触发
import { addTood, removeTood } from "./toodReducer";
import { ACTION_TYPES } from "./actionTypes";
//接收参数，vue组件上下文对应
export default function (ctx) {
  function dispatch(args) {
    const { type, payLoad } = args;
    //根据行为，触发reducer中的对应逻辑
    switch (type) {
      case ACTION_TYPES.del:
        removeTood.bind(ctx)(payLoad);
        break;
      case ACTION_TYPES.add:
        addTood.bind(ctx)(payLoad);
        break;
      default:
        break;
    }
  }
  //返回绑定组件实例的函数
  return dispatch.bind(ctx);
}

//主要事件处理逻辑文件（对应vue组件中的一个个method方法）
//添加一个tood
export function addTood(value) {
  const toodListItme = {
    title: value,
    complated: false,
    id: Date.now(),
  };
  this.list.push(toodListItme);
}
//删除一个tood
export function removeTood(item) {
  const { id } = item;
  this.list = this.list.filter((item) => item.id != id);
}

<template>
  <div id="app">
    <tood-list
      :list="list"
      @handelDel="handelDel"
      @addTood="addTood"
    ></tood-list>
  </div>
</template>
<script>
import ToodList from "@/components/ToodList/ToodList.vue";
import dispatch from "./components/ToodList/hook/dispatch";
import { ACTION_TYPES } from "./components/ToodList/hook/actionTypes";
export default {
  name: "App",
  components: {
    ToodList,
  },
  data() {
    return {
      list: [
        {
          title: "第一项",
          complated: false,
          id: 1,
        },
        {
          title: "第二项",
          complated: false,
          id: 2,
        },
        {
          title: "第三项",
          complated: true,
          id: 3,
        },
      ],
    };
  },
  methods: {
  //逻辑代码全部抽离到外部进行处理，当前组件只需要关注视图即可
    handelDel(item) {
      dispatch(this)({
        type: ACTION_TYPES.del,
        payLoad: item,
      });
    },
    addTood(value) {
      dispatch(this)({
        type: ACTION_TYPES.add,
        payLoad: value,
      });
    },
  },
};
</script>