vue前端搜索功能如何实现（使用Vue3+Vant组件实现App搜索历史记录功能示例代码）

export default {

  // 添加搜索首页历史查询记录
  addSearchHistory(state, payload) {
    // list中包含该记录的时，删除
    const index = state.searchHistoryList.indexOf(payload);
    if (index > -1) {
      state.searchHistoryList.splice(index, 1);
    }
    state.searchHistoryList.unshift(payload);
    // 历史记录中最大记20个记录
    const count = state.searchHistoryList.length;
    state.searchHistoryList.splice(20, count);
  },

  // 清除搜索首页历史查询记录
  clearSearchHistory(state) {
    state.searchHistoryList = [];
  },
};

<template>
  <!-- 搜索框 -->
  <search-bar
    @searchClick="searchClick"
    :placeholderValue="state.placeholderValue"
    :searchVal="state.searchVal">
  </search-bar>
  <li class="search">

    <!-- 搜索历史 -->
    <li class="history" v-if="state.isShowHistory">
      <span class="proHot">搜索历史</span>
      <span class="delHotSearch" @click="delHostClick">清除历史</span>

      <!-- 存放历史记录信息 -->
      <li class="searchBtn-li">
        <span v-for="(item, index) in state.historyList" :key="index" class="searchValBtn" >
        <van-button
          round
          size="small"
          @click="searchValClick(item)"
          >{{ item }}
        </van-button>
      </span>
      </li>
    </li>
  </li>
</template>

<script>
import {
  onMounted,
  reactive,
  getCurrentInstance,
} from 'vue';
import { Toast, Dialog } from 'vant';
import searchBar from '@/components/SearchBar.vue';
import { useRouter } from 'vue-router';
import { useStore } from 'vuex';

export default {

  components: {
    searchBar,
  },

  setup() {
    const router = useRouter();
    const store = useStore();
    const { proxy } = getCurrentInstance();
    const state = reactive({
      isShowHistory: '', // 是否显示历史记录
      searchVal: '', // 搜索关键字
      placeholderValue: '搜索产品/资讯/标准/成分/企业',
      historyList: [], // 历史搜索数据
    });


    // 回车搜索
    const searchClick = (val) => {
      store.commit('addSearchHistory', val);
      // router.push({ path: '/search-detail', query: { searchVal: val } });
    };

    // 清除历史记录
    const delHostClick = async () => {
      Dialog.confirm({
        message: '确定要删除历史搜索吗？',
      }).then(() => {
        store.commit('clearSearchHistory', store);
        state.isShowHistory = false;
        Toast({
          message: '删除成功',
          position: 'bottom',
        });
      });
    };
	
	// 初始化获取历史搜索记录信息
    onMounted(async () => {
      // 获取历史搜索信息
      state.historyList = store.state.searchHistoryList;
      // 判断初始化是否显示历史搜索
      if (state.historyList.length > 0) {
        state.isShowHistory = true;
      } else {
        state.isShowHistory = false;
      }
    });

    return {
      state,
      searchClick,
      delHostClick,
    };
  },
};
</script>

<style lang="less" scoped>
</style>

import { useStore } from 'vuex';

const store = useStore();

// 初始化获取历史搜索记录信息
	// 每次加载这和页面都会首先调用这个方法，来取最新的信息
    onMounted(async () => {
      // 获取历史搜索信息
      state.historyList = store.state.searchHistoryList;
      // 判断初始化是否显示历史搜索
      if (state.historyList.length > 0) {
        state.isShowHistory = true;
      } else {
        state.isShowHistory = false;
      }
    })

// 子组件发射一个事件，父组件调用
    const searchClick = (val) => {
    	// 将搜索值放入历史记录中	
      store.commit('addSearchHistory', val);
      // 路由跳转可以忽略
      // router.push({ path: '/search-detail', query: { searchVal: val } });
    };

// 清除历史记录
    const delHostClick = async () => {
      Dialog.confirm({
        message: '确定要删除历史搜索吗？',
      }).then(() => {
      	// 清空历史记录信息
        store.commit('clearSearchHistory', store);
        state.isShowHistory = false;
        Toast({
          message: '删除成功',
          position: 'bottom',
        });
      });
    };