用 JavaScript 代码实现网页惯性平滑滚动效果

NaN

<script>
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</script>

需要在 <body> 加载完后引入，如果在博客，一般在 footer 内引入。
可以自行下载 js 修改 animationTime:500,stepSize:100 部分，第一个为动画时间，第二个为滚动步长，从而造成惯性滚动的效果。另外，不止这两个参数可调，具体请自行查看。
如果你的博客已有平滑效果，无需再次引入，查看是否已有惯性效果：查看页面 body 上有无 wheel 监听即可。

NaN

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NaN

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isWindowScroll=(elem===scrollRoot||elem===document.body);if(elem.$scrollBehavior==null&&isScrollBehaviorSmooth(elem)){elem.$scrollBehavior=elem.style.scrollBehavior;elem.style.scrollBehavior='auto'}var step=function(time){var now=Date.now();var scrollX=0;var scrollY=0;for(var i=0;i<que.length;i++){var item=que[i];var elapsed=now-item.start;var finished=(elapsed>=options.animationTime);var position=(finished)?1:elapsed/options.animationTime;if(options.pulseAlgorithm){position=pulse(position)}var x=(item.x*position-item.lastX)>>0;var y=(item.y*position-item.lastY)>>0;scrollX+=x;scrollY+=y;item.lastX+=x;item.lastY+=y;if(finished){que.splice(i,1);i--}}if(isWindowScroll){window.scrollBy(scrollX,scrollY)}else{if(scrollX)elem.scrollLeft+=scrollX;if(scrollY)elem.scrollTop+=scrollY}if(!left&&!top){que=[]}if(que.length){requestFrame(step,elem,(1000/options.frameRate+1))}else{pending=false;if(elem.$scrollBehavior!=null){elem.style.scrollBehavior=elem.$scrollBehavior;elem.$scrollBehavior=null}}};requestFrame(step,elem,0);pending=true}function wheel(event){if(!initDone){init()}var target=event.target;if(event.defaultPrevented||event.ctrlKey){return true}if(isNodeName(activeElement,'embed')||(isNodeName(target,'embed')&&/\.pdf/i.test(target.src))||isNodeName(activeElement,'object')||target.shadowRoot){return true}var deltaX=-event.wheelDeltaX||event.deltaX||0;var deltaY=-event.wheelDeltaY||event.deltaY||0;if(isMac){if(event.wheelDeltaX&&isDivisible(event.wheelDeltaX,120)){deltaX=-120*(event.wheelDeltaX/Math.abs(event.wheelDeltaX))}if(event.wheelDeltaY&&isDivisible(event.wheelDeltaY,120)){deltaY=-120*(event.wheelDeltaY/Math.abs(event.wheelDeltaY))}}if(!deltaX&&!deltaY){deltaY=-event.wheelDelta||0}if(event.deltaMode===1){deltaX*=40;deltaY*=40}var overflowing=overflowingAncestor(target);if(!overflowing){if(isFrame&&isChrome){Object.defineProperty(event,"target",{value:window.frameElement});return parent.wheel(event)}return true}if(isTouchpad(deltaY)){return true}if(Math.abs(deltaX)>1.2){deltaX*=options.stepSize/120}if(Math.abs(deltaY)>1.2){deltaY*=options.stepSize/120}scrollArray(overflowing,deltaX,deltaY);event.preventDefault();scheduleClearCache()}function keydown(event){var target=event.target;var modifier=event.ctrlKey||event.altKey||event.metaKey||(event.shiftKey&&event.keyCode!==key.spacebar);if(!document.body.contains(activeElement)){activeElement=document.activeElement}var inputNodeNames=/^(textarea|select|embed|object)$/i;var buttonTypes=/^(button|submit|radio|checkbox|file|color|image)$/i;if(event.defaultPrevented||inputNodeNames.test(target.nodeName)||isNodeName(target,'input')&&!buttonTypes.test(target.type)||isNodeName(activeElement,'video')||isInsideYoutubeVideo(event)||target.isContentEditable||modifier){return true}if((isNodeName(target,'button')||isNodeName(target,'input')&&buttonTypes.test(target.type))&&event.keyCode===key.spacebar){return true}if(isNodeName(target,'input')&&target.type=='radio'&&arrowKeys[event.keyCode]){return true}var shift,x=0,y=0;var overflowing=overflowingAncestor(activeElement);if(!overflowing){return(isFrame&&isChrome)?parent.keydown(event):true}var clientHeight=overflowing.clientHeight;if(overflowing==document.body){clientHeight=window.innerHeight}switch(event.keyCode){case key.up:y=-options.arrowScroll;break;case key.down:y=options.arrowScroll;break;case key.spacebar:shift=event.shiftKey?1:-1;y=-shift*clientHeight*0.9;break;case key.pageup:y=-clientHeight*0.9;break;case key.pagedown:y=clientHeight*0.9;break;case key.home:if(overflowing==document.body&&document.scrollingElement)overflowing=document.scrollingElement;y=-overflowing.scrollTop;break;case key.end:var scroll=overflowing.scrollHeight-overflowing.scrollTop;var scrollRemaining=scroll-clientHeight;y=(scrollRemaining>0)?scrollRemaining+10:0;break;case key.left:x=-options.arrowScroll;break;case key.right:x=options.arrowScroll;break;default:return true}scrollArray(overflowing,x,y);event.preventDefault();scheduleClearCache()}function mousedown(event){activeElement=event.target}var uniqueID=(function(){var i=0;return function(el){return el.uniqueID||(el.uniqueID=i++)}})();var cacheX={};var cacheY={};var clearCacheTimer;var smoothBehaviorForElement={};function scheduleClearCache(){clearTimeout(clearCacheTimer);clearCacheTimer=setInterval(function(){cacheX=cacheY=smoothBehaviorForElement={}},1*1000)}function setCache(elems,overflowing,x){var cache=x?cacheX:cacheY;for(var i=elems.length;i--;)cache[uniqueID(elems[i])]=overflowing;return overflowing}function getCache(el,x){return(x?cacheX:cacheY)[uniqueID(el)]}function overflowingAncestor(el){var elems=[];var body=document.body;var rootScrollHeight=root.scrollHeight;do{var cached=getCache(el,false);if(cached){return setCache(elems,cached)}elems.push(el);if(rootScrollHeight===el.scrollHeight){var topOverflowsNotHidden=overflowNotHidden(root)&&overflowNotHidden(body);var isOverflowCSS=topOverflowsNotHidden||overflowAutoOrScroll(root);if(isFrame&&isContentOverflowing(root)||!isFrame&&isOverflowCSS){return setCache(elems,getScrollRoot())}}else if(isContentOverflowing(el)&&overflowAutoOrScroll(el)){return setCache(elems,el)}}while((el=el.parentElement))}function isContentOverflowing(el){return(el.clientHeight+10<el.scrollHeight)}function overflowNotHidden(el){var overflow=getComputedStyle(el,'').getPropertyValue('overflow-y');return(overflow!=='hidden')}function overflowAutoOrScroll(el){var overflow=getComputedStyle(el,'').getPropertyValue('overflow-y');return(overflow==='scroll'||overflow==='auto')}function isScrollBehaviorSmooth(el){var id=uniqueID(el);if(smoothBehaviorForElement[id]==null){var scrollBehavior=getComputedStyle(el,'')['scroll-behavior'];smoothBehaviorForElement[id]=('smooth'==scrollBehavior)}return smoothBehaviorForElement[id]}function addEvent(type,fn,arg){window.addEventListener(type,fn,arg||false)}function removeEvent(type,fn,arg){window.removeEventListener(type,fn,arg||false)}function isNodeName(el,tag){return el&&(el.nodeName||'').toLowerCase()===tag.toLowerCase()}function directionCheck(x,y){x=(x>0)?1:-1;y=(y>0)?1:-1;if(direction.x!==x||direction.y!==y){direction.x=x;direction.y=y;que=[];lastScroll=0}}if(window.localStorage&&localStorage.SS_deltaBuffer){try{deltaBuffer=localStorage.SS_deltaBuffer.split(',')}catch(e){}}function isTouchpad(deltaY){if(!deltaY)return;if(!deltaBuffer.length){deltaBuffer=[deltaY,deltaY,deltaY]}deltaY=Math.abs(deltaY);deltaBuffer.push(deltaY);deltaBuffer.shift();clearTimeout(deltaBufferTimer);deltaBufferTimer=setTimeout(function(){try{localStorage.SS_deltaBuffer=deltaBuffer.join(',')}catch(e){}},1000);var dpiScaledWheelDelta=deltaY>120&&allDeltasDivisableBy(deltaY);var tp=!allDeltasDivisableBy(120)&&!allDeltasDivisableBy(100)&&!dpiScaledWheelDelta;if(deltaY<50)return true;return tp}function isDivisible(n,divisor){return(Math.floor(n/divisor)==n/divisor)}function allDeltasDivisableBy(divisor){return(isDivisible(deltaBuffer[0],divisor)&&isDivisible(deltaBuffer[1],divisor)&&isDivisible(deltaBuffer[2],divisor))}function isInsideYoutubeVideo(event){var elem=event.target;var isControl=false;if(document.URL.indexOf('www.youtube.com/watch')!=-1){do{isControl=(elem.classList&&elem.classList.contains('html5-video-controls'));if(isControl)break}while((elem=elem.parentNode))}return isControl}var requestFrame=(function(){return(window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||function(callback,element,delay){window.setTimeout(callback,delay||(1000/60))})})();var MutationObserver=(window.MutationObserver||window.WebKitMutationObserver||window.MozMutationObserver);var getScrollRoot=(function(){var SCROLL_ROOT=document.scrollingElement;return function(){if(!SCROLL_ROOT){var dummy=document.createElement('div');dummy.style.cssText='height:10000px;width:1px;';document.body.appendChild(dummy);var bodyScrollTop=document.body.scrollTop;var docElScrollTop=document.documentElement.scrollTop;window.scrollBy(0,3);if(document.body.scrollTop!=bodyScrollTop)(SCROLL_ROOT=document.body);else(SCROLL_ROOT=document.documentElement);window.scrollBy(0,-3);document.body.removeChild(dummy)}return SCROLL_ROOT}})();function pulse_(x){var val,start,expx;x=x*options.pulseScale;if(x<1){val=x-(1-Math.exp(-x))}else{start=Math.exp(-1);x-=1;expx=1-Math.exp(-x);val=start+(expx*(1-start))}return val*options.pulseNormalize}function pulse(x){if(x>=1)return 1;if(x<=0)return 0;if(options.pulseNormalize==1){options.pulseNormalize/=pulse_(1)}return pulse_(x)}var userAgent=window.navigator.userAgent;var isEdge=/Edge/.test(userAgent);var isChrome=/chrome/i.test(userAgent)&&!isEdge;var isSafari=/safari/i.test(userAgent)&&!isEdge;var isMobile=/mobile/i.test(userAgent);var isIEWin7=/Windows NT 6.1/i.test(userAgent)&&/rv:11/i.test(userAgent);var isOldSafari=isSafari&&(/Version\/8/i.test(userAgent)||/Version\/9/i.test(userAgent));var isEnabledForBrowser=(isChrome||isSafari||isIEWin7)&&!isMobile;var supportsPassive=false;try{window.addEventListener("test",null,Object.defineProperty({},'passive',{get:function(){supportsPassive=true}}))}catch(e){}var wheelOpt=supportsPassive?{passive:false}:false;var wheelEvent='onwheel'in document.createElement('div')?'wheel':'mousewheel';if(wheelEvent&&isEnabledForBrowser){addEvent(wheelEvent,wheel,wheelOpt);addEvent('mousedown',mousedown);addEvent('load',init)}function SmoothScroll(optionsToSet){for(var key in optionsToSet)if(defaultOptions.hasOwnProperty(key))options[key]=optionsToSet[key]}SmoothScroll.destroy=cleanup;if(window.SmoothScrollOptions)SmoothScroll(window.SmoothScrollOptions);if(typeof define==='function'&&define.amd)define(function(){return SmoothScroll});else if('object'==typeof exports)module.exports=SmoothScroll;else window.SmoothScroll=SmoothScroll})();