HarmonyOS 鸿蒙Next 有没有函数统一的防抖方案

暂时没有统一的防抖方法。 1、普通的防抖可以使用setTimeout实现，

2、生成带返回值的防抖异步函数可以参考以下代码实现

/**

 * 生成带返回值的防抖异步函数，因为防抖而被取消的调用会得到默认值

 *

 * @template T

 * @param fn {(...[*]) => Promise<T>} 异步函数

 * @param defaultValueGetter {() => T} 默认值获取

 * @param delay {number} 防抖时长(ms)

 * @return {(...[*]) => Promise<T>}

 */

export function debounceWithDefaultValue(fn, defaultValueGetter, delay = 500) {

  let timer = null;

  let lastPromiseReject = null;

  return function (...args) {

    const that = this;

    const debouncedMessage = 'debounced';

    return new Promise((resolve, reject) => {

      clearTimeout(timer);

      if (lastPromiseReject) {

        lastPromiseReject(new Error(debouncedMessage));

      }

      lastPromiseReject = reject;

      timer = setTimeout(() => {

        try {

          resolve(fn.apply(that, args));

        } catch (e) {

          reject(e);

        }

        lastPromiseReject = null;

      }, delay);

    }).catch(reason => {

      if (reason?.message === debouncedMessage) {

        return defaultValueGetter.apply(that);

      } else {

        throw reason;

      }

    });

  };

}