RISEBY
				也许你可以scroll-behavior在调用之前设置.scrollBy(),然后在之后重置它。var root = document.querySelector(':root');var btnInstantScroll = document.querySelector('#btnInstantScroll');var btnDefaultScroll = document.querySelector('#btnDefaultScroll');btnInstantScroll.addEventListener('click', function() {  // Change scroll behavior  root.setAttribute("style", "scroll-behavior: auto;");  // Timeout ensures styles are applied before scrolling  setTimeout(function() {    window.scrollBy(0, -2000);        // Reset to CSS defaults.    root.removeAttribute("style");  }, 0)})btnDefaultScroll.addEventListener('click', function() {  window.scrollBy(0, -2000);}):root {  scroll-behavior: smooth;}.scrollable {  height: 2000px;  background: repeating-linear-gradient(#e66465, #e66465 20px, #9198e5 20px, #9198e5 25px);}.controls {  padding: 15px;  position: fixed;  bottom: 0;}<div class="scrollable"></div><div class="controls">  <button type="button" id="btnInstantScroll">    Instant scroll  </button>  <button type="button" id="btnDefaultScroll">    Scroll using doc settings  </button></div>