bml.user.js

// ==UserScript==
// @name New Script
// @namespace Violentmonkey Scripts
// @match https://show.bilibili.com/platform/checkSeat.html?*
// @grant none
// ==/UserScript==
// 
// 
(async () => {
    const open = XMLHttpRequest.prototype.open;
    const nextTick = () => new Promise(resolve => setTimeout(resolve, 0));
    const target = 2;
    const submit = async () => {
        if ($('.finish-btn').length === 0) {
          await nextTick();
        } else {
          $('.finish-btn').click();
        }
    }
    XMLHttpRequest.prototype.open = function () {
        this.addEventListener('load', async function () {
            if (this.readyState === 4 && this.responseURL.startsWith('https://show.bilibili.com/api/ticket/area/seat')) {
                let counter = 0;
                const seats = [];
                $('.seats').find('li').each(function () {
                    if (!$(this).hasClass('unavailable') && !$(this).hasClass('selected') && seats.length < target) {
                        seats.push($(this).attr('id'));
                    }
                });
              for (const seat of seats) {
                $('#' + seat).click();
                await nextTick();
              }
              submit();
            }
        });
        open.apply(this, arguments);
    };
    
})()