很多时候，我们需要一些炫酷的动画效果，让页面更加吸引用户的眼球，现有比较好用的JS动画库有：velocity和GSAP(支持falsh和js)。今天这里主要学习的是velocity配合css3动画，快速打造属于你的专题页面。
PS：发现各种炫酷的效果都是由这些简单的动作通过组合实现的，发现最终效果和动画的设计者有很大关系，鄙人就属于那种不怎么懂设计的人，这里只是抛砖引玉。
虽然我今天不准备详细介绍GSAP这个动画库，但是还有有必要把相关资源的入口放在这里，供想要了解的 同学进行深入的 学习。
最好的学习就是查看官方API文档，其次结合场景才会出现的问题，可以交流一下应该就可以解决。
废话不多说了，进入今天的正题。
基础技能
velocity功能
包含$.animate()所有功能，并且包含切换、转换、循环、缓动、CSS切换、scroll功能，从效率角度来说，比CSS更高。
兼容性
支持IE8+，chrome、firefox、android、ios（可以配置mobileMA，提升手机访问效果）
默认配置
可以使用$.Velocity.defaults进行查看管理。
注：关于配置的使用说明，可以参考官方文档说明。其中begin、complete监听动画状态
调用方式
支持两种书写方式
- 第一种：
/**
* @param {Object|String} 需要改变css属性最终状态值或者是注册动画
* @param {Object} 动画基本配置，可以查看默认配置
*/
$element.velocity(properties, options)
- 第二种
/**
* @param {Object} 操作元素，可以是原生对象，也可以是包装对象
* @param {Object|String} 需要改变css属性最终状态值或者是注册动画
* @param {Object} 动画基本配置，可以查看默认配置
*/
$.Velocity($element, properties, options);
另：所有的属性值都可以是函数，返回最终的值
提升技能
自定义动画效果
velocity提供了注册自定义动画的方法，方便使用者自定义，并进行方便多次使用
$.Velocity.RegisterEffect(name, {
defaultDuration: duration,
calls: [
[ { property: value }, durationPercentage, { options } ],
[ { property: value }, durationPercentage, { options } ]
],
reset: { property: value, property: value }
});
来一个简单的例子：
$.Velocity.RegisterEffect("callout.pulse", {
defaultDuration: 900,
calls: [
[ { scaleX: 1.1 }, 0.50 ],
[ { scaleX: 1 }, 0.50 ]
]
});
注册一个callout.pulse方法，如何进行使用呢？可以参照基础技能中的调用方式，这里使用其中一种方式
$elements.velocity('callout.pulse'); //相当于是properties参数值
UI pack--动画包
官方提供一些动画包，可以直接进行使用，也可以通过自定义注册动画，然后进行使用。
现有的的动画效果有：
callout.bounce,callout.shake,callout.flash,callout.pulse,callout.swing,callout.tada,transition.fadeIn,transition.fadeOut,transition.flipXIn,transition.flipXOut,transition.flipYIn,transition.flipYOut,transition.flipBounceXIn,transition.flipBounceXOut,transition.flipBounceYIn,transition.flipBounceYOut,transition.swoopIn,transition.swoopOut,transition.whirlIn,transition.whirlOut,transition.shrinkIn,transition.shrinkOut,transition.expandIn,transition.expandOut,transition.bounceIn,transition.bounceOut,transition.bounceUpIn,transition.bounceUpOut,transition.bounceDownIn,transition.bounceDownOut,transition.bounceLeftIn,transition.bounceLeftOut,transition.bounceRightIn,transition.bounceRightOut,transition.slideUpIn,transition.slideUpOut,transition.slideDownIn,transition.slideDownOut,transition.slideLeftIn,transition.slideLeftOut,transition.slideRightIn,transition.slideRightOut,transition.slideUpBigIn,transition.slideUpBigOut,transition.slideDownBigIn,transition.slideDownBigOut,transition.slideLeftBigIn,transition.slideLeftBigOut,transition.slideRightBigIn,transition.slideRightBigOut,transition.perspectiveUpIn,transition.perspectiveUpOut,transition.perspectiveDownIn,transition.perspectiveDownOut,transition.perspectiveLeftIn,transition.perspectiveLeftOut,transition.perspectiveRightIn,transition.perspectiveRightOut
具体效果可以查看最下面的例子。
自定义动画队列
官方提供了执行动画队列的方法，$.Velocity.RunSequence(animationArr);其中animationArr是动画数组，数组的每个元素是一个元素动画效果，具体例子如下：
var mySequence = [
{ elements: $element1, properties: { translateX: 100 }, options: { duration: 1000 } },
{ elements: $element2, properties: { translateX: 200 }, options: { duration: 1000, sequenceQueue: false },
{ elements: $element3, properties: { translateX: 300 }, options: { duration: 1000?}
];
$.Velocity.RunSequence(mySequence);
//默认队列动画是按照顺序执行的，可以通过设置sequenceQueue改变当前元素执行时机。默认是true，当为true时，指的是按照顺序执行，如果设置成false指的是，可以和上一个元素动画同时执行
支持promise
引入官方推荐的bluebird和when，即可采用如下使用方式：
$element.velocity(properties, options).then(); //需要注意是的是无线循环和队列不支持该形式
终极技能
配合css3动画，达到最佳效果
友情提示：
velocity在进场和出场动画方面优势比较大，css3在循环动画上优势比较大。当然万恶的IE兼容问题
基于上面所讲到的，实现了一个基于jquery、velocity、animation.css实现的动画，仅供参考
/**
* 动画处理
* author: 黑MAO
*/
$(function() {
'use strict';
/****内部方法开始****/
/**
* css动画执行函数
* @param {Object} 目标元素
* @param {String} 初始class
* @param {String} 动画类型
* @param {Number} 动画时长
* @param {Number} 动画延迟
* @param {Number} 循环次数
*/
var timer;
function _cssRun(targetEl, className, animation, duration, delay, loop) {
duration = duration*1 || 1000;
delay = delay*1 || 0;
loop = (loop || loop == 0) ? loop*1 : 1;
if(loop < 1) {
loop = 'infinite';
}
$(targetEl).removeClass();
$(targetEl).addClass(className).addClass(animation);
$(targetEl).css({
'animation-duration': duration+'ms',
'animation-delay': delay+'ms',
'animation-iteration-count': loop+''
});
if(loop != 'infinite') {
clearTimeout(timer);
timer = setTimeout(function() {
$(targetEl).removeClass(animation);
}, duration*loop + delay);
}
}
/**
* 监听select变化方法
* @param {Object} 目标元素
* @param {Object} 操作元素集合
* @param {String} 初始class
* @param {String} 动画类型 ["css", "js"]
*/
function _changeFunc(targetEl, opElementObj, className, animationType) {
var animation = $(opElementObj.animationEl).val();
var duration = $(opElementObj.durationEl).val();
var delay = $(opElementObj.delayEl).val();
var loop = $(opElementObj.loopEl).val();
if(animationType == "css") {
_cssRun(targetEl, className, animation, duration, delay, loop);
}else {
var ras = new Ras();
if(animation) {
ras.run(targetEl, 'stop');
ras.run(targetEl, animation, {duration: duration, delay: delay, stagger: 200, drag: true});
}
}
}
/**
* 初始化动画
* @param {Array} 动画数组
* @param {Object} 操作元素对象
* @param {Object} 目标元素
* @param {Number} 动画延迟
* @param {String} 需要显示的动画类型 ["show", "hide", "normal", "all"]
* @param {String} 动画类型 ["css", "js"]
*/
function _initAnimation(animationArr, opElementObj, targetEl, type, animationType) {
var conf = opElementObj;
var className = $(targetEl).attr("class");
$(conf.animationEl).prepend('<option value="" diabled="disabled">选择动画类型</option>');
$(animationArr).each(function(key, val) {
var isShow = false;
switch(type) {
case "show":
if(val.indexOf('In') > 0) {
isShow = true;
}
break;
case "hide":
if(val.indexOf('Out') > 0) {
isShow = true;
}
break;
case "normal":
if(val.indexOf('Out') == -1 && val.indexOf('In') == -1) {
isShow = true;
}
break;
default:
isShow = true;
break;
}
isShow && $(conf.animationEl).append('<option value="'+val+'">'+val+'</option>');
});
$(conf.animationEl).on('change', function() {
_changeFunc(targetEl, conf, className, animationType);
});
$(conf.durationEl).on('change', function() {
_changeFunc(targetEl, conf, className, animationType);
});
$(conf.delayEl).on('change', function() {
_changeFunc(targetEl, conf, className, animationType);
});
$(conf.loopEl).on('change', function() {
_changeFunc(targetEl, conf, className, animationType);
});
}
/****内部方法结束****/
function Ras(opts) {
var conf = {
beforeIndex : 0, //上一页序列号
currentIndex : 0, //当前页序列号
playing : true, //是否在运行
downward : true, //是否向下滚动
imgList: [], //页面内图片列表
quenes: {
show: [], //页面显示列表
hide: [] //页面隐藏列表
},
navFunc: null, //导航回调函数
cssAnimationExtra: [], //css动画扩展
jsAnimationExtra: [] //js动画扩展
};
this.conf = $.extend(conf, opts);
}
//对外暴漏
window.Ras = Ras;
$.extend(Ras.prototype, {
init: function() {
var self = this;
var conf = this.conf;
//绑定键盘和鼠标事件
var quenes = conf.quenes;
var showList = conf.quenes.show;
var hideList = conf.quenes.hide;
var senceNum = showList.length;
$(document).on('mousewheel keyup',function(e){
if( !conf.playing ){
conf.playing = true;
if( e.keyCode && (e.keyCode==39||e.keyCode==40)){
conf.downward = true;
}
if( e.keyCode && (e.keyCode==37||e.keyCode==38) ){
conf.downward = false;
}
if( e.deltaY){
conf.downward = e.deltaY<0?true:false;
}
if( e.keyCode == 37 || e.keyCode == 38 || e.keyCode == 39 || e.keyCode == 40 || e.deltaY ){
conf.beforeIndex = conf.currentIndex;
conf.currentIndex = conf.downward ?conf.currentIndex + 1:conf.currentIndex - 1;
conf.currentIndex = conf.currentIndex>=senceNum?0:conf.currentIndex;
conf.currentIndex = conf.currentIndex<0?senceNum-1:conf.currentIndex;
conf.navFunc && conf.navFunc(conf.currentIndex);
self.show(hideList[conf.beforeIndex], showList[conf.currentIndex], function() {
conf.playing = false;
});
}
}
return false;
});
//处理图片预加载
var imgList = conf.imgList;
imgList.length && self.imgLoader(imgList);
//默认显示第一屏
self.show(null, showList[0], function() {
conf.playing = false;
});
},
/**
* 初始化CSS动画
* @param {Object} 联动元素集合
* @param {Object} 目标元素
* @param {String} 选项类型 ["show", "hide", "normal", "all"]
*/
initCssAnimation: function(opElementObj, targetEl, type) {
var conf = this.conf;
var animationStr = 'bounce,pulse,rubberBand,shake,swing,tada,bounceIn,bounceInDown,bounceInLeft,bounceInRight,bounceInUp,bounceOut,bounceOutDown,bounceOutLeft,bounceOutRight,bounceOutUp,fadeIn,fadeInDown,fadeInDownBig,fadeInLeft,fadeInLeftBig,fadeInRight,fadeInRightBig,fadeInUp,fadeInUpBig,fadeOut,fadeOutDown,fadeOutDownBig,fadeOutLeft,fadeOutLeftBig,fadeOutRight,fadeOutRightBig,fadeOutUp,fadeOutUpBig,flip,flipInX,flipInY,flipOutX,flipOutY,lightSpeedOut,rotateIn,rotateInDownLeft,rotateInDownRight,rotateInUpLeft,rotateInUpRight,rotateOut,rotateOutDownLeft,rotateOutDownRight,rotateOutUpLeft,rotateOutUpRight,hinge,rollIn,rollOut,zoomIn,zoomInDown,zoomInLeft,zoomInRight,zoomInUp,zoomOut,zoomOutDown,zoomOutLeft,zoomOutRight,zoomOutUp,slideInDown,slideInLeft,slideInRight,slideInUp,slideOutDown,slideOutLeft,slideOutRight,slideOutUp,magic,openDownLeft,openDownRight,openUpLeft,openUpRight,openDownLeftRetourn,openDownRightRetourn,openUpLeftRetourn,openUpRightRetourn,openDownLeftOut,openDownRightOut,openUpLeftOut,openUpRightOut,perspectiveDown,perspectiveLeft,perspectiveRight,perspectiveUp,perspectiveDownRetourn,perspectiveLeftRetourn,perspectiveRightRetourn,perspectiveUpRetourn,puffIn,puffOut,rotateDown,rotateLeft,rotateRight,rotateUp,slideDown,slideLeft,slideRight,slideUp,slideDownRetourn,slideLeftRetourn,slideRightRetourn,slideUpRetourn,swap,twisterInDown,twisterInUp,vanishIn,vanishOut,swashOut,swashIn,foolishOut,holeOut,tinRightOut,tinLeftOut,tinUpOut,tinDownOut,tinRightIn,tinUpIn,tinDownIn,bombRightOut,bombLeftOut,boingInUp,boingOutDown,spaceOutUp,spaceOutRight,spaceOutLeft,spaceInUp,spaceInRight,spaceInDown,spaceInLeft,boomIn,circleRotate';
var animationArr = animationStr.split(',');
var arr = [];
$.merge(arr, animationArr, conf.cssAnimationExtra);
arr = $.unique(arr);
_initAnimation(arr, opElementObj, targetEl, type, 'css');
},
/**
* 初始化JS动画
* @param {Object} 联动元素集合
* @param {Object} 目标元素
* @param {String} 选项类型 ["show", "hide", "normal", "all"]
*/
initJsAnimation: function(opElementObj, targetEl, type) {
var conf = this.conf;
var animationStr = 'callout.bounce,callout.shake,callout.flash,callout.pulse,callout.swing,callout.tada,transition.fadeIn,transition.fadeOut,transition.flipXIn,transition.flipXOut,transition.flipYIn,transition.flipYOut,transition.flipBounceXIn,transition.flipBounceXOut,transition.flipBounceYIn,transition.flipBounceYOut,transition.swoopIn,transition.swoopOut,transition.whirlIn,transition.whirlOut,transition.shrinkIn,transition.shrinkOut,transition.expandIn,transition.expandOut,transition.bounceIn,transition.bounceOut,transition.bounceUpIn,transition.bounceUpOut,transition.bounceDownIn,transition.bounceDownOut,transition.bounceLeftIn,transition.bounceLeftOut,transition.bounceRightIn,transition.bounceRightOut,transition.slideUpIn,transition.slideUpOut,transition.slideDownIn,transition.slideDownOut,transition.slideLeftIn,transition.slideLeftOut,transition.slideRightIn,transition.slideRightOut,transition.slideUpBigIn,transition.slideUpBigOut,transition.slideDownBigIn,transition.slideDownBigOut,transition.slideLeftBigIn,transition.slideLeftBigOut,transition.slideRightBigIn,transition.slideRightBigOut,transition.perspectiveUpIn,transition.perspectiveUpOut,transition.perspectiveDownIn,transition.perspectiveDownOut,transition.perspectiveLeftIn,transition.perspectiveLeftOut,transition.perspectiveRightIn,transition.perspectiveRightOut';
var animationArr = animationStr.split(',');
var arr = [];
$.merge(arr, animationArr, conf.cssAnimationExtra);
arr = $.unique(arr);
_initAnimation(arr, opElementObj, targetEl, type, 'js');
},
/**
* 入场动画
* @param {Array} 出场队列
* @param {Array} 入场队列
* @param {Function} 入场完成回调
*/
show: function(beforeQuene, currentQuene, callback) {
var self = this;
self.hide(beforeQuene);
currentQuene && self.run(currentQuene).then(function() {
callback && callback();
});
},
/**
* 出场动画
* @param {Array} 出场队列
* @param {Function} 出场完成回调
*/
hide: function(quene, callback) {
var self = this;
callback && callback();
quene && self.run(quene);
},
/**
* 图片懒加载
* @param {Array} 图片列表
* @param {Function} 图片加载回调
*/
imgLoader: function(imgList, callback) {
var count = imgList.length,
i = 0,
success = 0,
failed = 0,
failList = [];
for ( ; i < count ; i++ ) {
var img = new Image();
(function(i){
img.onload = function () {
success++;
if( (success + failed) == count ) {
callback&&callback.call( imgList , failed, failList);
}
};
img.onerror = function () {
failed++;
failList.push(imgList[i]);
if( (success + failed) == count ) {
callback&&callback.call( imgList , failed, failList );
}
};
img.src = imgList[i];
})(i);
}
},
/**
* 注册自定义动画
*/
register: function() {
var self = this;
var args = [].slice.apply(arguments);
$.Velocity.RegisterEffect.apply(self, args);
},
/**
* 封装velocity方法，统一管理队列和单个动画
* @return {Object} promise对象
*/
run: function() {
var deferred = $.Deferred();
var self = this;
var args = [].slice.call(arguments);
var len = args[0].length;
if($.isArray(args[0])) {
if(!args[0][len-1].options){
args[0][len-1].options = {};
}
args[0][len-1].options.complete = function() {
deferred.resolve();
};
$.Velocity.RunSequence.call(self, args[0]);
return deferred.promise();
}else {
return $.Velocity.animate.apply(self, args);
}
},
/**
* 启动CSS动画
* @param {Object} 操作元素
* @param {String} 初始class
* @param {String} css动画
* @param {Number} 动画时长
* @param {Number} 动画延迟
* @return {Object} promise对象
*/
cssAnimationRun: function(targetEl, className, animation, duration, delay, loop) {
loop = (loop === true) ? 0 : loop;
_cssRun(targetEl, className, animation, duration, delay, loop);
},
/**
* 启动JS动画
* @param {Object} 操作元素
* @param {String} css动画
* @param {Number} 动画时长
* @param {Number} 动画延迟
* @return {Object} promise对象
*/
jsAnimationRun: function(targetEl, animation, options) {
var opts = {
stagger: 200,
drag: true
};
opts = $.extend(opts, options);
if(animation) {
this.run(targetEl, 'stop');
this.run(targetEl, animation, opts);
}
}
});
});
使用方式：
var ras = new Ras({
cssAnimationExtra: ['bounce'],
jsAnimationExtra: ['callout.bounce']
});
ras.init();
//调用相关方法
附录（资源地址）：
<link rel="stylesheet" href="http://s1.qhimg.com/!efd6dff2/animation.css">
<script src="http://s0.qhimg.com/lib/jquery/191.js" ></script>
<script src="http://s3.qhimg.com/!44713922/bluebird.js" ></script>
<script src="http://s6.qhimg.com/!7c8590ec/jquery.mousewheel.min.js"></script>
<script src="http://s6.qhimg.com/!ccefcc09/velocity.min.js"></script>
<script src="http://s5.qhimg.com/!d0b08d4d/velocity.ui.min.js"></script>
参考资料：