@planjs/utils/es/bom/window-smooth-scrolling.js

🔧 Common tools collection

import requestAnimationFrame from './requestAnimationFrame';
/**
 * 时间内，滚动条平滑滚到指定位置
 * @param to
 * @param duration
 * @category Bom
 */

function windowSmoothScrolling(to, duration) {
  function _setScrollTop(value) {
    window.scrollTo(0, value);
    return value;
  }

  function _getScrollTop() {
    return document.documentElement && document.documentElement.scrollTop || document.body.scrollTop;
  }

  if (duration < 0) {
    _setScrollTop(to);

    return;
  }

  var diff = to - _getScrollTop();

  if (diff === 0) return;
  var step = diff / duration * 10;
  requestAnimationFrame(function () {
    if (Math.abs(step) > Math.abs(diff)) {
      _setScrollTop(_getScrollTop() + diff);
    }

    _setScrollTop(_getScrollTop() + diff);

    if (diff > 0 && _getScrollTop() >= to || diff < 0 && _getScrollTop() <= to) {
      return;
    }

    windowSmoothScrolling(to, duration - 16);
  });
}

export default windowSmoothScrolling;