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Bangumi Thickbox Counter

Counting the rest number of your words in thickbox

// ==UserScript==
// @name         Bangumi Thickbox Counter
// @namespace    https://github.com/bangumi/scripts/tree/master/inchei
// @version      0.3
// @description  Counting the rest number of your words in thickbox
// @icon         https://bgm.tv/img/favicon.ico
// @author       inchei
// @include      /^https?://(bangumi\.tv|bgm\.tv|chii\.in)/.*
// @grant        none
// ==/UserScript==

(function() {
    const winHrefKey = new RegExp('^https?://((bgm|bangumi).tv|chii.in)/subject/*');
    const TB = document.querySelectorAll('.thickbox');

    function main(textarea, tip) {
        var restNum = 200 - textarea.value.length;
        if (restNum >= 0) {
            tip.style.color = '#666';
            tip.innerText = '吐槽 (简评，剩余 ' + restNum + ' 字):';
        }
        else {
            tip.style.color = 'red';
            tip.innerText = '吐槽 (简评，超出 ' + -restNum + ' 字):';
        }
    }

    for (var i=0; i<TB.length; i++) {
        TB[i].addEventListener('click', () => {
            var textarea;
            var tip;
            if(!winHrefKey.test(window.location.href)) {
                setInterval(() => {
                    if (document.querySelector('#TB_iframeContent')) {
                        textarea = document.querySelector('#TB_iframeContent').contentWindow.document.querySelector('textarea#comment.quick');
                        tip = document.querySelector('#TB_iframeContent').contentWindow.document.querySelector('[for="comment"]');
                        main(textarea, tip);
                        textarea.onkeyup = () => {
                            main(textarea, tip);
                        };
                        window.clearInterval();
                    }
                }, 500);
            } else {
                textarea = document.querySelector('textarea#comment.quick');
                tip = document.querySelector('[for="comment"]');
                main(textarea, tip);
                textarea.onkeyup = main(textarea, tip);
            }
        });
    }
})();