我正在寻找一个简单的，跨浏览器“滚动到顶部”的动画，我可以应用到一个链接。我不想需要一个JS库，如jQuery/Moo等。
// jQuery Equivilant to convert to pure JS...
$('html, body').animate({scrollTop:0}, 400);
对于那些在跳进图书馆之前应该100%学习JS的人来说，我是一个完美的例子。：(
当前回答
我已经选择了@timwolla answer的@akai版本，并添加了stopAnimation函数作为返回，所以在开始新的动画之前，旧的动画可以停止。
if ( this.stopAnimation )
this.stopAnimation()
this.stopAnimation = scrollTo( el, scrollDestination, 300 )
// definitions
function scrollTo(element, to, duration) {
var start = element.scrollTop,
change = to - start,
increment = 20,
timeOut;
var animateScroll = function(elapsedTime) {
elapsedTime += increment;
var position = easeInOut(elapsedTime, start, change, duration);
element.scrollTop = position;
if (elapsedTime < duration) {
timeOut = setTimeout(function() {
animateScroll(elapsedTime);
}, increment);
}
};
animateScroll(0);
return stopAnimation
function stopAnimation() {
clearTimeout( timeOut )
}
}
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;
}
其他回答
纯javascript滚动类
这是一个老问题，但我认为我可以用一些花哨的东西和更多的选项来回答，如果你想对动画有更多的控制。
跨浏览器 复制/粘贴就绪解决方案(你只需要CSS和JS) 3种动画模式:["normal"|"linear"|false] 自定义您的动画与可用的设置-使其时髦或流畅 双击可跳过动画 每一次点击都会增加初始速度 向下拖动滚动条来停止滚动动画 通过鼠标滚轮向下停止滚动动画 动画按钮淡出滚动
这里是一个纯JS类来照顾你的滚动:
参见codepen的演示或到底部运行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();
完整的类脚本+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 /> <p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. 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一件容易的事。
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);
}
平滑滚动现在在所有现代浏览器中都是默认实现的。 您还可以对其进行填充，以获得旧浏览器的支持。
// Scroll to specific values
// scrollTo is the same
window.scroll({
top: 2500,
left: 0,
behavior: 'smooth'
});
// Scroll certain amounts from current position
window.scrollBy({
top: 100, // could be negative value
left: 0,
behavior: 'smooth'
});
// Scroll to a certain element
document.querySelector('.hello').scrollIntoView({
behavior: 'smooth'
});
// Scroll certain amounts from current position for any element
document.querySelector('.scrollable-element').scrollBy({
top: 100,
behavior: 'smooth'
});
// Scroll to top
var element = document.querySelector('.scrollable-element');
element.scrollBy({
top: -element.scrollTop,
behavior: 'smooth'
});
来源:https://css-tricks.com/snippets/jquery/smooth-scrolling/
看来已经有很多解决方案了。不管怎样，这是另一个，使用简化方程。
// 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');
这是一种基于上述答案的跨浏览器方法
function scrollTo(to, duration) {
if (duration < 0) return;
var scrollTop = document.body.scrollTop + document.documentElement.scrollTop;
var difference = to - scrollTop;
var perTick = difference / duration * 10;
setTimeout(function() {
scrollTop = scrollTop + perTick;
document.body.scrollTop = scrollTop;
document.documentElement.scrollTop = scrollTop;
if (scrollTop === to) return;
scrollTo(to, duration - 10);
}, 10);
}
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