react 封装防抖

封装防抖

import React, { useRef, useEffect, useCallback } from 'react';
 
function useDebounce(fn, delay) {
  const delayRef = useRef(delay);
  const fnRef = useRef(fn);
 
  // 更新ref值
  useEffect(() => {
    delayRef.current = delay;
  }, [delay]);
 
  useEffect(() => {
    fnRef.current = fn;
  }, [fn]);
 
  const debounced = useRef();
 
  // 防抖函数
  const debounce = useCallback((...args) => {
    const later = () => {
      debounced.current = null;
    };
 
    clearTimeout(debounced.current);
    debounced.current = setTimeout(() => {
      fnRef.current(...args);
      later();
    }, delayRef.current);
  }, []);
 
  useEffect(
    () => () => {
      clearTimeout(debounced.current);
    },
    []
  );
 
  return debounce;
}
 
export default useDebounce;

使用方法

import React, { useState } from 'react';
import useDebounce from './useDebounce';
 
const MyComponent = () => { 
  // 创建防抖函数
  const debouncedHandleChange = useDebounce(() => {
    console.log('防抖触发了');
  }, 500);
 
  return (
    <input
      type="text"
      value={value}
      onChange={(e) => {
        debouncedHandleChange(e);
      }}
    />
  );
};
 
export default MyComponent;

注：本人前端小白 ，如有不对的地方还请多多指教