//过滤一个结果的空记录添加，过滤空搜索  默认保存10条记录，自己可修改function setHistoryItems(keyword) {    keyword = keyword.replace("/^\s+|\s+$/g","");    let { historyIndexSearchItems } = localStorage;    if (historyIndexSearchItems === undefined) {            localStorage.historyIndexSearchItems = keyword;      } else {            const onlyItem = historyIndexSearchItems.split('|').filter(e => e != keyword);            if (onlyItem.length > 0){              historyIndexSearchItems = keyword + '|' + onlyItem.slice(0,9).join('|');          }            localStorage.historyIndexSearchItems = historyIndexSearchItems;    }  }function clearHistory() {    localStorage.removeItem('historyIndexSearchItems');   }