Use Vue3+Vant component to implement App search history function (sample code)

export default {

  // Add search home page history query record addSearchHistory(state, payload) {
    // When the list contains the record, delete it const index = state.searchHistoryList.indexOf(payload);
    if (index > -1) {
      state.searchHistoryList.splice(index, 1);
    }
    state.searchHistoryList.unshift(payload);
    // The maximum number of records in the history record is 20 const count = state.searchHistoryList.length;
    state.searchHistoryList.splice(20, count);
  },

  // Clear the search history on the home page clearSearchHistory(state) {
    state.searchHistoryList = [];
  },
};

<template>
  <!-- Search Box -->
  <search-bar
    @searchClick="searchClick"
    :placeholderValue="state.placeholderValue"
    :searchVal="state.searchVal">
  </search-bar>
  <div class="search">

    <!-- Search History -->
    <div class="history" v-if="state.isShowHistory">
      <span class="proHot">Search History</span>
      <span class="delHotSearch" @click="delHostClick">Clear History</span>

      <!-- Store historical record information-->
      <div class="searchBtn-div">
        <span v-for="(item, index) in state.historyList" :key="index" class="searchValBtn" >
        <van-button
          round
          size="small"
          @click="searchValClick(item)"
          >{{ item }}
        </van-button>
      </span>
      </div>
    </div>
  </div>
</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: '', // Whether to display history searchVal: '', // Search keyword placeholderValue: 'Search for products/information/standards/ingredients/enterprises',
      historyList: [], // historical search data});


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

    // Clear history const delHostClick = async () => {
      Dialog.confirm({
        message: 'Are you sure you want to delete your search history? ',
      }).then(() => {
        store.commit('clearSearchHistory', store);
        state.isShowHistory = false;
        Toast({
          message: 'Deleted successfully',
          position: 'bottom',
        });
      });
    };
	
	// Initialize and obtain historical search record information onMounted(async () => {
      // Get historical search information state.historyList = store.state.searchHistoryList;
      // Determine whether to initialize the display history search 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();

// Initialize and obtain historical search record information // Each time this page is loaded, this method will be called first to get the latest information onMounted(async () => {
      // Get historical search information state.historyList = store.state.searchHistoryList;
      // Determine whether to initialize the display history search if (state.historyList.length > 0) {
        state.isShowHistory = true;
      } else {
        state.isShowHistory = false;
      }
    })

// The child component emits an event, and the parent component calls const searchClick = (val) => {
    	// Put the search value into the history	
      store.commit('addSearchHistory', val);
      // Route redirection can be ignored // router.push({ path: '/search-detail', query: { searchVal: val } });
    };

// Clear history const delHostClick = async () => {
      Dialog.confirm({
        message: 'Are you sure you want to delete your search history? ',
      }).then(() => {
      	// Clear history informationstore.commit('clearSearchHistory', store);
        state.isShowHistory = false;
        Toast({
          message: 'Deleted successfully',
          position: 'bottom',
        });
      });
    };