Function $_

tech-study.js:1946–1964

* @description 异步选择器 * @param selector * @returns

(selector, parent = document, timeout)

 * @returns
 */
function $_(selector, parent = document, timeout) {
    return new Promise((resolve) => {
        const timer = setInterval(() => {
            const selectors = Array.from(parent.querySelectorAll(selector));
            // 存在元素
            if (selectors.length) {
                clearInterval(timer);
                resolve(selectors);
            }
        }, 10);
        // 超时
        if (timeout) {
            setTimeout(() => {
                clearInterval(timer);
                resolve([]);
            }, timeout);
        }
    });
}
/**
 * @description 创建元素块
 * @param eles