跨浏览器JavaScript(不是jQuery ...)滚动到顶部动画

Question

我正在寻找一个简单的,跨浏览器的"滚动到顶部"动画,我可以应用于链接.我不想要一个JS库,如jQuery/Moo等.

// jQuery Equivilant to convert to pure JS...
$('html, body').animate({scrollTop:0}, 400);

对于那些应该在进入图书馆之前学会了JS 100%的人来说,我是一个完美的案例.:(

Answer 1

function scrollTo(element, to, duration) {
    if (duration <= 0) return;
    var difference = to - element.scrollTop;
    var perTick = difference / duration * 10;

    setTimeout(function() {
        element.scrollTop = element.scrollTop + perTick;
        if (element.scrollTop === to) return;
        scrollTo(element, to, duration - 10);
    }, 10);
}

演示:

function runScroll() {
  scrollTo(document.body, 0, 600);
}
var scrollme;
scrollme = document.querySelector("#scrollme");
scrollme.addEventListener("click",runScroll,false)

function scrollTo(element, to, duration) {
  if (duration <= 0) return;
  var difference = to - element.scrollTop;
  var perTick = difference / duration * 10;

  setTimeout(function() {
    element.scrollTop = element.scrollTop + perTick;
    if (element.scrollTop == to) return;
    scrollTo(element, to, duration - 10);
  }, 10);
}

<p>Very long page.Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. Very long page. 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</p>
<button id=scrollme type="button">To the top</button>

Answer 2

看起来已经有很多解决方案了.无论如何,这是另一个,使用缓动方程..

// first add raf shim
// http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
window.requestAnimFrame = (function(){
  return  window.requestAnimationFrame       ||
          window.webkitRequestAnimationFrame ||
          window.mozRequestAnimationFrame    ||
          function( callback ){
            window.setTimeout(callback, 1000 / 60);
          };
})();

// main function
function scrollToY(scrollTargetY, speed, easing) {
    // scrollTargetY: the target scrollY property of the window
    // speed: time in pixels per second
    // easing: easing equation to use

    var scrollY = window.scrollY || document.documentElement.scrollTop,
        scrollTargetY = scrollTargetY || 0,
        speed = speed || 2000,
        easing = easing || 'easeOutSine',
        currentTime = 0;

    // min time .1, max time .8 seconds
    var time = Math.max(.1, Math.min(Math.abs(scrollY - scrollTargetY) / speed, .8));

    // easing equations from https://github.com/danro/easing-js/blob/master/easing.js
    var easingEquations = {
            easeOutSine: function (pos) {
                return Math.sin(pos * (Math.PI / 2));
            },
            easeInOutSine: function (pos) {
                return (-0.5 * (Math.cos(Math.PI * pos) - 1));
            },
            easeInOutQuint: function (pos) {
                if ((pos /= 0.5) < 1) {
                    return 0.5 * Math.pow(pos, 5);
                }
                return 0.5 * (Math.pow((pos - 2), 5) + 2);
            }
        };

    // add animation loop
    function tick() {
        currentTime += 1 / 60;

        var p = currentTime / time;
        var t = easingEquations[easing](p);

        if (p < 1) {
            requestAnimFrame(tick);

            window.scrollTo(0, scrollY + ((scrollTargetY - scrollY) * t));
        } else {
            console.log('scroll done');
            window.scrollTo(0, scrollTargetY);
        }
    }

    // call it once to get started
    tick();
}

// scroll it!
scrollToY(0, 1500, 'easeInOutQuint');

Answer 3

我修改了TimWolla的答案,使用二次输入缓和(更平滑:).这是一个实际的例子:在jsFiddle上.Easing功能可在此处获得:Robert Penner的Easing功能

document.getElementsByTagName('button')[0].onclick = function () {
    scrollTo(document.body, 0, 1250);   
}

function scrollTo(element, to, duration) {
    var start = element.scrollTop,
        change = to - start,
        increment = 20;

    var animateScroll = function(elapsedTime) {        
        elapsedTime += increment;
        var position = easeInOut(elapsedTime, start, change, duration);                        
        element.scrollTop = position; 
        if (elapsedTime < duration) {
            setTimeout(function() {
                animateScroll(elapsedTime);
            }, increment);
        }
    };

    animateScroll(0);
}

function easeInOut(currentTime, start, change, duration) {
    currentTime /= duration / 2;
    if (currentTime < 1) {
        return change / 2 * currentTime * currentTime + start;
    }
    currentTime -= 1;
    return -change / 2 * (currentTime * (currentTime - 2) - 1) + start;
}

Answer 4

window.scroll({top: 0, left: 0, behavior: 'smooth' });

从一篇关于Smooth Scrolling的文章中得到了它.

如果需要,可以使用一些填充剂.

Answer 5

没有JQuery代码,希望这会对你有所帮助.

function TopscrollTo() {
if(window.scrollY!=0)
{
    setTimeout(function() {
       window.scrollTo(0,window.scrollY-30);
        TopscrollTo();
    }, 100);
   }
}

在按钮单击事件或您想要的任何其他元素/事件上调用此TopscrollTo()函数.

Answer 6

我修改了@TimWolla的代码以添加更多选项和一些移动功能.此外,增加了支持与到跨浏览器的document.body.scrollTop和document.documentElement.scrollTop

// scroll to top
scrollTo(0, 1000);

// Element to move, time in ms to animate
function scrollTo(element, duration) {
    var e = document.documentElement;
    if(e.scrollTop===0){
        var t = e.scrollTop;
        ++e.scrollTop;
        e = t+1===e.scrollTop--?e:document.body;
    }
    scrollToC(e, e.scrollTop, element, duration);
}

// Element to move, element or px from, element or px to, time in ms to animate
function scrollToC(element, from, to, duration) {
    if (duration <= 0) return;
    if(typeof from === "object")from=from.offsetTop;
    if(typeof to === "object")to=to.offsetTop;

    scrollToX(element, from, to, 0, 1/duration, 20, easeOutCuaic);
}

function scrollToX(element, xFrom, xTo, t01, speed, step, motion) {
    if (t01 < 0 || t01 > 1 || speed<= 0) {
        element.scrollTop = xTo;
        return;
    }
    element.scrollTop = xFrom - (xFrom - xTo) * motion(t01);
    t01 += speed * step;

    setTimeout(function() {
        scrollToX(element, xFrom, xTo, t01, speed, step, motion);
    }, step);
}
function easeOutCuaic(t){
    t--;
    return t*t*t+1;
}

http://jsfiddle.net/forestrf/tPQSv/

缩小版:http: //jsfiddle.net/forestrf/tPQSv/139/

// c = element to scroll to or top position in pixels
// e = duration of the scroll in ms, time scrolling
// d = (optative) ease function. Default easeOutCuaic
function scrollTo(c,e,d){d||(d=easeOutCuaic);var a=document.documentElement;if(0===a.scrollTop){var b=a.scrollTop;++a.scrollTop;a=b+1===a.scrollTop--?a:document.body}b=a.scrollTop;0>=e||("object"===typeof b&&(b=b.offsetTop),"object"===typeof c&&(c=c.offsetTop),function(a,b,c,f,d,e,h){function g(){0>f||1<f||0>=d?a.scrollTop=c:(a.scrollTop=b-(b-c)*h(f),f+=d*e,setTimeout(g,e))}g()}(a,b,c,0,1/e,20,d))};
function easeOutCuaic(t){
    t--;
    return t*t*t+1;
}

Answer 7

实际上有一种纯粹的javascript方法可以在不使用setTimeout或者使用requestAnimationFramejQuery的情况下完成此任务.

简而言之,在scrollView中找到要滚​​动到的元素,并使用scrollIntoView

el.scrollIntoView({behavior:"smooth"});

这是一个傻瓜.

Answer 8

改编自这个答案:

function scroll(y, duration) {

    var initialY = document.documentElement.scrollTop || document.body.scrollTop;
    var baseY = (initialY + y) * 0.5;
    var difference = initialY - baseY;
    var startTime = performance.now();

    function step() {
        var normalizedTime = (performance.now() - startTime) / duration;
        if (normalizedTime > 1) normalizedTime = 1;

        window.scrollTo(0, baseY + difference * Math.cos(normalizedTime * Math.PI));
        if (normalizedTime < 1) window.requestAnimationFrame(step);
    }
    window.requestAnimationFrame(step);
}

这应该允许您从任何地方平滑地滚动(余弦函数)到指定的"y".

Answer 9

PURE JAVASCRIPT SCROLLER CLASS

这是一个古老的问题,但我想如果你想对动画有更多的控制权,我可以回答一些奇特的东西以及更多的选项.

跨浏览器

复制/粘贴就绪解决方案(您只需要CSS和JS)

3个动画模式:["normal"|"linear"| false]

使用可用设置自定义动画 - 使其快速或流畅

双击以跳过动画

每次下一次单击都会增加初始速度

通过向下拖动滚动条停止滚动动画

通过鼠标滚轮停止滚动动画

滚动时动画按钮淡入淡出

这是一个纯粹的JS类来处理滚动:

在 CODEPEN看到演示或者去底部并且运行SINPET

// ------------------- USE EXAMPLE ---------------------
// *Set options
var options = {
  'showButtonAfter': 200, // show button after scroling down this amount of px
  'animate': "linear", // [false|normal|linear] - for false no aditional settings are needed

  'normal': { // applys only if [animate: normal] - set scroll loop distanceLeft/steps|ms
    'steps': 20, // the more steps per loop the slower animation gets
    'ms': 10 // the less ms the quicker your animation gets
  }, 
  'linear': { // applys only if [animate: linear] - set scroll px|ms
    'px': 30, // the more px the quicker your animation gets
    'ms': 10 // the less ms the quicker your animation gets
  }, 
};


// *Create new Scroller and run it.
var scroll = new Scroller(options);
scroll.init();

全级脚本+使用示例:

// PURE JAVASCRIPT (OOP)

function Scroller(options) {
  this.options = options;
  this.button = null;
  this.stop = false;
}

Scroller.prototype.constructor = Scroller;

Scroller.prototype.createButton = function() {

  this.button = document.createElement('button');
  this.button.classList.add('scroll-button');
  this.button.classList.add('scroll-button--hidden');
  this.button.textContent = "^";
  document.body.appendChild(this.button);
}

Scroller.prototype.init = function() {
  this.createButton();
  this.checkPosition();
  this.click();
  this.stopListener();
}

Scroller.prototype.scroll = function() {
  if (this.options.animate == false || this.options.animate == "false") {
    this.scrollNoAnimate();
    return;
  }
  if (this.options.animate == "normal") {
    this.scrollAnimate();
    return;
  }
  if (this.options.animate == "linear") {
    this.scrollAnimateLinear();
    return;
  }
}
Scroller.prototype.scrollNoAnimate = function() {
  document.body.scrollTop = 0;
  document.documentElement.scrollTop = 0;
}
Scroller.prototype.scrollAnimate = function() {
  if (this.scrollTop() > 0 && this.stop == false) {
    setTimeout(function() {
      this.scrollAnimate();
      window.scrollBy(0, (-Math.abs(this.scrollTop()) / this.options.normal['steps']));
    }.bind(this), (this.options.normal['ms']));
  }
}
Scroller.prototype.scrollAnimateLinear = function() {
  if (this.scrollTop() > 0 && this.stop == false) {
    setTimeout(function() {
      this.scrollAnimateLinear();
      window.scrollBy(0, -Math.abs(this.options.linear['px']));
    }.bind(this), this.options.linear['ms']);
  }
}

Scroller.prototype.click = function() {

  this.button.addEventListener("click", function(e) {
    e.stopPropagation();
    this.scroll();
  }.bind(this), false);

  this.button.addEventListener("dblclick", function(e) {
    e.stopPropagation();
    this.scrollNoAnimate();
  }.bind(this), false);

}

Scroller.prototype.hide = function() {
  this.button.classList.add("scroll-button--hidden");
}

Scroller.prototype.show = function() {
  this.button.classList.remove("scroll-button--hidden");
}

Scroller.prototype.checkPosition = function() {
  window.addEventListener("scroll", function(e) {
    if (this.scrollTop() > this.options.showButtonAfter) {
      this.show();
    } else {
      this.hide();
    }
  }.bind(this), false);
}

Scroller.prototype.stopListener = function() {

  // stop animation on slider drag
  var position = this.scrollTop();
  window.addEventListener("scroll", function(e) {
    if (this.scrollTop() > position) {
      this.stopTimeout(200);
    } else {
      //...
    }
    position = this.scrollTop();
  }.bind(this, position), false);

  // stop animation on wheel scroll down
  window.addEventListener("wheel", function(e) {
    if (e.deltaY > 0) this.stopTimeout(200);
  }.bind(this), false);
}

Scroller.prototype.stopTimeout = function(ms) {
  this.stop = true;
  // console.log(this.stop); //
  setTimeout(function() {
    this.stop = false;
    console.log(this.stop); //
  }.bind(this), ms);
}

Scroller.prototype.scrollTop = function() {
  var curentScrollTop = document.documentElement.scrollTop || document.body.scrollTop;
  return curentScrollTop;
}



// ------------------- USE EXAMPLE ---------------------
// *Set options
var options = {
  'showButtonAfter': 200, // show button after scroling down this amount of px
  'animate': "normal", // [false|normal|linear] - for false no aditional settings are needed

  'normal': { // applys only if [animate: normal] - set scroll loop distanceLeft/steps|ms
    'steps': 20, // the more steps per loop the slower animation gets
    'ms': 10 // the less ms the quicker your animation gets
  },
  'linear': { // applys only if [animate: linear] - set scroll px|ms
    'px': 30, // the more px the quicker your animation gets
    'ms': 10 // the less ms the quicker your animation gets
  },
};
// *Create new Scroller and run it.
var scroll = new Scroller(options);
scroll.init();

/* CSS */

@import url(https://fonts.googleapis.com/css?family=Open+Sans);
 body {
  font-family: 'Open Sans', sans-serif;
  font-size: 1.2rem;
  line-height: 2rem;
  height: 100%;
  position: relative;
  padding: 0 25%;
}
.scroll-button {
  font-size: 1.2rem;
  line-height: 2rem;
  padding: 10px;
  width: 50px;
  height: 50px;
  background: black;
  color: white;
  border-radius: 50%;
  position: fixed;
  right: 20px;
  bottom: 20px;
  visibility: visible;
  filter: alpha(opacity=50);
  filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=50);
  opacity: 0.5;
  cursor: pointer;
  transition: all 1.2s;
  -webkit-transition: all 1.2s;
  -moz-transition: all 1.2s;
  -ms-transition: all 1.2s;
  -o-transition: all 1.2s;
}
.scroll-button:hover {
  filter: alpha(opacity=100);
  filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}
.scroll-button--hidden {
  filter: alpha(opacity=0);
  filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  visibility: hidden;
}

<!-- HTML -->

<h1>Scroll down by 200px for button to appear</h1>
<ul>
  <li>Cross-browser</li>
  <li>Copy/Paste solution</li>
  <li>3 animate modes: <b>["normal"|"linear"|false]</b></li>
  <li>Customize your aniamtion with aveilable settings - make it snapy or fluent</li>
  <li>Double click to skip animation</li>
  <li>Every next single click adds initial speed</li>
  <li>Stop scroll animation by draging down the scroll bar</li>
  <li>Stop scroll animation by mouse wheel down</li>
  <li>Animated button fade-in-out on scroll</li>
</ul>

<br />
<br />
<pre>
// ------------------- USE EXAMPLE ---------------------
// *Set options
var options = {
  'showButtonAfter': 200, // show button after scroling down this amount of px
  'animate': "normal", // [false|normal|linear] - for false no aditional settings are needed
  
  'normal': { // applys only if [animate: normal] - set scroll loop distanceLeft/steps|ms
    'steps': 20, // the more steps the slower animation gets
    'ms': 20 // the less ms the quicker your animation gets
  }, 
  'linear': { // applys only if [animate: linear] - set scroll px|ms
    'px': 55, // the more px the quicker your animation gets
    'ms': 10 // the less ms the quicker your animation gets
  }, 
};

// *Create new Scroller and run it.
var scroll = new Scroller(options);
scroll.init();
</pre>
<br />
<br />
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<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Obcaecati quibusdam, tempora cupiditate quaerat tempore ullam delectus voluptates optio eum placeat provident consequatur iure reprehenderit vero quae sapiente architecto earum nemo.</span><span>Quis molestias sint fuga doloribus, necessitatibus nulla. Esse ipsa, itaque asperiores. Tempora a sequi nobis cumque incidunt aspernatur, pariatur rem voluptatibus. Atque veniam magnam, ea laudantium ipsum reprehenderit sapiente repellendus.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Minima, pariatur at explicabo aliquid repudiandae vero eum quasi totam voluptates iusto unde ad repellendus ipsam et voluptatem hic adipisci! Vero, nobis!</span><span>Consequatur eligendi quo quas omnis architecto dolorum aperiam doloremque labore, explicabo enim incidunt vitae saepe, quod soluta illo odit provident amet beatae quasi animi. Similique nostrum molestiae animi corrupti qui?</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias quis, tempora laborum incidunt qui fuga adipisci doloremque iusto commodi vitae est, nemo iure placeat ut sit optio, consequuntur voluptas impedit.</span><span>Eos officiis, hic esse unde eaque, aut tenetur voluptate quam sint vel exercitationem totam dolor odio soluta illo praesentium non corrupti! Consequuntur velit, mollitia excepturi. Minus, veniam accusantium! Aliquam, ea!</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reprehenderit quis reiciendis veritatis expedita velit vitae amet magni sunt rerum in blanditiis aut tempore quia fugiat, voluptates officia quaerat quam id.</span><span>Sapiente tempore repudiandae, quae doloremque ullam odio quia ea! Impedit atque, ipsa consequatur quis obcaecati voluptas necessitatibus, cupiditate sunt amet ab modi illum inventore, a dolor enim similique architecto est!</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Itaque non aliquam, sit illo quas deserunt esse nobis reprehenderit quidem fuga beatae eligendi reiciendis omnis qui repellat velit earum blanditiis possimus.</span><span>Provident aspernatur ducimus, illum beatae debitis vitae non dolorum rem officia nostrum natus accusantium perspiciatis ad soluta maiores praesentium eveniet qui hic quis at quaerat ea perferendis. Ut, aut, natus.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ratione corrupti quibusdam, sed hic veniam. Perspiciatis ex, quod architecto natus autem totam at commodi excepturi maxime pariatur corporis, veritatis vero, praesentium.</span><span>Nesciunt suscipit, nobis eos perferendis ex quaerat inventore nihil qui magnam saepe rerum velit reiciendis ipsam deleniti ducimus eligendi odio eius minima vero, nisi voluptates amet eaque, iste, labore laudantium.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illo, voluptas accusantium ad omnis velit distinctio! Adipisci magnam nihil nostrum molestiae rem dolores, ut ad nemo, dolor quos itaque maiores quaerat!</span><span>Quia ad suscipit reprehenderit vitae inventore eius non culpa maiores omnis sit obcaecati vel placeat quibusdam, ipsa exercitationem nam odit, magni nobis. Quam quas, accusamus expedita molestiae asperiores eaque ex?</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Rerum explicabo doloribus nihil iusto quasi vel expedita dignissimos amet mollitia, temporibus aut atque architecto assumenda dolorum nam velit deserunt totam numquam.</span><span>Ab perferendis labore, quae. Quidem architecto quo officia deserunt ea doloribus libero molestias id nisi perferendis eum porro, quibusdam! Odit aliquid placeat rem aut officia minus sit esse eos obcaecati!</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eligendi nostrum repellendus placeat, unde aperiam. Fuga, voluptas, minima. Debitis nemo ducimus itaque laboriosam error quaerat reprehenderit quo animi incidunt. Nulla, quis!</span><span>Explicabo assumenda dicta ratione? Tempora commodi asperiores, explicabo doloremque eius quia impedit possimus architecto sit nemo odio eum fuga minima dolor iste mollitia sequi dolorem perspiciatis unde quisquam laborum soluta.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Veniam officia corporis, reiciendis laudantium, voluptate voluptates necessitatibus assumenda, delectus quisquam velit deserunt! Reprehenderit, vel quaerat accusantium nesciunt libero animi. Sequi, eveniet?</span><span>Animi natus pariatur porro, alias, veniam aut est tempora adipisci molestias harum modi cumque assumenda enim! Expedita eveniet autem illum rerum nostrum ipsum alias neque aut, dolorum impedit pariatur non?</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis aliquid rerum, odio veniam ipsam ad officia quos repellat ex aperiam voluptatum optio est animi possimus minus. Sapiente voluptates amet dolorem.</span><span>Illo necessitatibus similique asperiores inventore ut cumque nihil assumenda debitis explicabo rerum, dolorum molestiae culpa accusantium. Nisi doloremque optio provident blanditiis, eum ipsam asperiores, consequatur aliquam vel sit mollitia sunt.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Enim, totam harum perferendis. Minus ea perferendis laboriosam, iste, qui corrupti, quas veritatis omnis officiis animi fuga perspiciatis impedit! Error, harum, voluptas.</span><span>Omnis laborum, cum mollitia facilis ipsa unde distinctio maxime nesciunt illum perspiciatis ut officiis, eligendi numquam dolorem quod modi ipsam est rerum perferendis repellendus totam. Maxime excepturi culpa alias labore.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit deleniti, odit sit consequatur dolorum omnis repellendus, alias vel ullam numquam. Nostrum obcaecati hic, possimus delectus nam atque aliquid explicabo cum.</span><span>Explicabo tenetur minima consequatur, aliquam, laudantium non consequuntur facilis sint, suscipit debitis ex atque mollitia magni quod repellat ratione dolorum excepturi molestiae cumque iusto eos unde? Voluptatum dolores, porro provident!</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. At laboriosam fuga aperiam eveniet, obcaecati esse, nulla porro iure molestiae praesentium sint fugiat ea voluptate suscipit voluptates mollitia, voluptatibus. Autem, non.</span><span>Numquam velit culpa tempora ratione ipsum minus modi in? Nisi reiciendis, voluptate voluptatem maxime repellat quae odio, repellendus aliquid laborum dolorem. Labore, fuga ea minima explicabo quae voluptatum necessitatibus, similique.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quasi, rerum dolorum nemo error fugiat ut, modi, architecto libero maxime laborum repellendus doloribus neque aperiam adipisci quaerat obcaecati deserunt consequuntur amet!</span><span>Sint, assumenda nisi obcaecati doloremque iste. Perspiciatis accusantium, distinctio impedit cum esse recusandae sunt. Officiis culpa dolore eius, doloribus natus, dolorum excepturi vitae fugiat ullam provident harum! Suscipit, assumenda, harum.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odit, nihil tenetur tempore eligendi qui nesciunt consequatur delectus accusantium consectetur ipsa, nulla doloribus dolores rerum corporis, laborum, laboriosam hic mollitia repellat.</span><span>Ab deleniti vitae blanditiis quod tenetur! Voluptatem temporibus ab eaque quis? Quis odio aliquid harum temporibus totam, ipsa eius iusto fugiat enim in, quibusdam molestiae aliquam consequatur nulla, consequuntur sint.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum odit praesentium quos, earum nesciunt laudantium illo tempora eligendi, porro doloremque mollitia neque aperiam inventore nam maxime dolor labore aspernatur molestias.</span><span>Voluptatibus provident hic cupiditate placeat, ut reprehenderit nisi eum, dolores ad sed quis. Doloribus molestiae, quae rem odit expedita soluta, facilis animi corporis velit ut in, recusandae harum laboriosam veritatis.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Incidunt repudiandae molestias magnam delectus veritatis labore, corporis dicta officia quos, ad corrupti odit! Ad hic officia maxime eveniet consectetur similique adipisci!</span><span>Quia at, nesciunt aliquid delectus ex alias voluptas maxime hic esse. Incidunt, laborum quos mollitia dolores et! Voluptas commodi asperiores, fugit quidem quis corporis, a eaque, animi, autem deserunt repellendus.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sequi quas, voluptas hic minima inventore optio, id quidem placeat necessitatibus omnis voluptatibus vitae mollitia tempora consequuntur consequatur, illo facilis accusamus illum.</span><span>Voluptates consequuntur ipsam odit. Eius quis ipsam vitae, nihil molestias perferendis corporis recusandae consequatur vero iure blanditiis quas adipisci quos voluptatem rem illo voluptate. Eveniet officiis iure sit laborum veniam.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Suscipit a quis cumque nostrum quisquam molestiae pariatur, asperiores natus necessitatibus adipisci illum cupiditate nam vero, tempora excepturi laborum, earum. Voluptates, nobis.</span><span>Pariatur suscipit, hic blanditiis libero, iusto, quam cupiditate nam error id asperiores repellat ab consequatur vitae ipsa voluptatem totam magni reiciendis expedita maxime dolor! Minus explicabo quas, laborum ab omnis!</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore qui ad assumenda placeat optio illo molestias corporis dolorum cum. Doloribus eius autem obcaecati minima, asperiores iure dignissimos ducimus suscipit dolorem.</span><span>Blanditiis earum accusamus eaque temporibus necessitatibus voluptatum dolorem enim debitis inventore assumenda quae error perspiciatis aut, nulla delectus quam ipsa sapiente ea aliquam laboriosam repudiandae. Nesciunt praesentium, beatae eos quasi!</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cupiditate dicta voluptate impedit? Ad voluptatum dicta earum perferendis asperiores. Dolore distinctio modi expedita consequatur provident perspiciatis neque totam rerum placeat quas.</span><span>Eveniet optio est possimus iste accusantium ipsum illum. Maiores saepe repudiandae facere, delectus iure dolorem vitae nihil pariatur minima, reprehenderit eligendi dolore impedit, nisi doloribus quidem similique. Optio, delectus, minus.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Iste ex molestiae architecto enim nihil tempore, atque consequuntur doloribus recusandae sed consequatur veniam quos, in consectetur perspiciatis magni nostrum ab voluptates.</span><span>Nisi quos mollitia quis in maiores asperiores labore deserunt! Voluptate voluptas adipisci qui hic officia molestias, laborum necessitatibus sint nam vel minus incidunt perspiciatis recusandae sunt, rerum suscipit doloremque possimus!</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. At nihil perferendis quae quidem facilis aliquid pariatur possimus hic asperiores, recusandae exercitationem adipisci atque laborum, delectus, odit ab reprehenderit distinctio dolor.</span><span>Non excepturi quos aspernatur repudiandae laboriosam, unde molestias, totam, sapiente harum accusamus delectus laborum ipsam velit amet nisi! Consectetur aliquam provident voluptatibus saepe repudiandae eveniet laborum beatae, animi, voluptate dolores.</span></p>
<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque magni, eum ipsa, veritatis facere voluptatem dolorum nobis neque minus debitis asperiores iste. Pariatur sequi quam, tempora. Dignissimos, esse similique tempora.</span><span>Ex delectus excepturi autem sunt, nemo repudiandae, recusandae nostrum accusantium nobis temporibus magnam eligendi similique veritatis deleniti, eaque blanditiis possimus at! Repellat alias laboriosam ipsum commodi dolorem, corporis dolore suscipit!</span></p>

Answer 10

简单.

var scrollIt = function(time) {
    // time = scroll time in ms
    var start = new Date().getTime(),
        scroll = document.documentElement.scrollTop + document.body.scrollTop,
        timer = setInterval(function() {
            var now = Math.min(time,(new Date().getTime())-start)/time;
            document.documentElement.scrollTop
                = document.body.scrollTop = (1-time)/start*scroll;
            if( now == 1) clearTimeout(timer);
        },25);
}

Answer 11

没有人提到CSS属性 scroll-behavior

的CSS

html {
  scroll-behavior: smooth;
}

JS

window.scrollTo(0,0)