react 滚动到指定位置上方100像素的位置

/*
使用方法：
 import { useRef } from 'react';
 const anchor = useRef<HTMLDivElement>(null);
 <div ref={anchor} > test </div>
 <button onClick={()=> {
     scrollWithAnimation(anchor.current?.offsetTop || 0);
 }} > jump </button>
*/
export const scrollWithAnimation = (dest: number) => {
  const sub = (target: number) => {
    const cur = window.scrollY;
    const offset = cur - target;
    if (offset > 150) {
      window.scrollTo(0, cur - 150);
      setTimeout(() => {
        sub(target);
      }, 60);
    } else {
      window.scrollTo(0, target);
    }
  };

  sub(dest - 100);
};