我测试db操作没问题
// ==UserScript==
// @name         New Userscript
// @namespace    https://bbs.tampermonkey.net.cn/
// @version      0.1.0
// @description  try to take over the world!
// @author       You
// @match        https://bbs.tampermonkey.net.cn/thread-4142-1-1.html
// ==/UserScript==
(function () {
    'use strict';
    // Your code here...
    const db = openDatabase('mydb1', '1.0', 'Test', 2 * 1024 * 1024);
    // 创建表
    db.transaction(function (tx) {
        tx.executeSql('CREATE TABLE IF NOT EXISTS 高压订单表 (id integer primary key AutoIncrement,原订单号,订单编号,备注,退货,价格)')
        //tx.executeSql('INSERT INTO 高压订单表 (原订单号,订单编号,备注,退货) VALUES ("3006153649820202437","20221105183654","扣子有问题","")')
        //tx.executeSql('UPDATE 高压订单表 SET 订单编号="20221105183654" WHERE 备注="领子脏了"')
    });
    console.log('db ok');
})();