Function waitForElement

linuxdo-helper.user.js:708–743

* 等待指定元素出现在页面中 * @param {string} selector - CSS选择器 * @returns {Promise } 找到的元素

(selector)

     * @returns {Promise<HTMLElement>} 找到的元素
     */
    function waitForElement(selector) {
        return new Promise((resolve, reject) => {
            const element = document.querySelector(selector);

            if (element) {
                resolve(element);
                return;
            }

            const observer = new MutationObserver(() => {
                const element = document.querySelector(selector);

                if (element) {
                    observer.disconnect();
                    resolve(element);
                }
            });

            observer.observe(document.body, {
                childList: true,
                subtree: true
            });

            const timeout = randomByJitter(
                getConfig().waitForElement,
                RANDOM_DELAY_CONFIG.waitForElementJitter,
                500
            );

            setTimeout(() => {
                observer.disconnect();
                console.log('【错误】未找到元素：', selector);
                reject(new Error('未找到：' + selector));
            }, timeout);
        });
    }

    /**
     * 获取页面中的原始链接列表