Function debounce

tech-study.js:2481–2491

* @description 防抖 * @param callback * @param delay * @returns

(callback, delay)

 * @returns
 */
function debounce(callback, delay) {
    let timer = -1;
    return function (...args) {
        if (timer !== -1) {
            clearTimeout(timer);
        }
        timer = setTimeout(() => {
            callback.apply(this, args);
        }, delay);
    };
}
/**
 * @description 判断是否为移动端
 * @returns