/**
 * 防抖
 * @category Utils
 * @param delay 延迟时间
 * @param fn 回调函数
 */
export const debounce = (fn, delay: number) => {
    let timer;
    return function(this, ...args) {
        clearTimeout(timer);
        timer = setTimeout(() => {
            fn.apply(this, args);
        }, delay);
    };
};