repostJavaScript运动框架之速度时间版本

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一、javascript运动框架之速度版

1.1 运动框架的实现思路

运动，其实就是在一段时间内改变 left 、 right 、 width 、 height 、 opactiy 的值，到达目的地之后停止

  • 位移 top,left
  • 折叠 width,height
  • 淡入淡出 opacity
  • 时间有关系
    • setInterval
    • setTimeout
  • 用javascript直接获取行间样式很容易，但如果要获取非行间样式那我们只能借助函数了。我这里编写了一个名为getStyle的函数，专门处理取非行间的样式
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function getStyle(obj,attr){
return getComputedStyle(obj)[attr]?getComputedStyle(obj)[attr]:obj.currentStyle[attr];
}

1.2 一些案例演示

1.2.1 运动之速
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<div id="box"></div>
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#box {
width: 100px;
height: 100px;
background: red;
position: relative;
left: 0;
}
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var box = document.getElementById("box");
var speed = 0; //步长
var target = 600;
var timer = null;
timer = setInterval(function(){
var curr = parseInt(getStyle(box,"left")); //去除getStyle(box,"left")的单位
if(curr == target){
clearInterval(timer);
speed = 0;
alert("运动结束");
}else{
speed +=10;
box.style.left = speed + "px";
}
 
 
},1000/30);
 
//监控left的值的变化 怎么样拿到left的值
//alert(getComputedStyle(box)["width"]);
//alert(box.currentStyle["left"]);
// currentStyle --IE
// getComputedStyle -- 非IE
 
function getStyle(obj,attr){
return getComputedStyle(obj)[attr]?getComputedStyle(obj)[attr]:obj.currentStyle[attr];
}

在线演示

1.2.2 运动速度之封装1
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<div id="ball"></div>
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#ball {
width: 100px;
height: 100px;
background: blue;
}
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var ball = document.getElementById("ball");
 
ball.onmouseover = function(){
//同时变换 用的最多
//move(this,"width",500,10);
//move(this,"height",500,10);
move(ball,{"width":400,"height":300},10);
}
ball.onmouseout = function(){
//move(this,"width",100,-10);
//move(this,"height",100,-10);
move(ball,{"width":100,"height":100},-10);
}
function move(obj,json,speed){
clearInterval(obj.timer);
var mark = true;
obj.timer = setInterval(function(){
for(var attr in json){
var curr = parseInt(getStyle(obj,attr));
var target = json[attr];
if(curr != target){
obj.style[attr] = curr+speed+"px";
mark = false;
}
}
if(mark){
clearInterval(obj.timer);
}
},1000/30);
}
 
 
function getStyle(obj,attr){
return getComputedStyle(obj)[attr]?getComputedStyle(obj)[attr]:obj.currentStyle[attr];
}
  • 需要注意的地方
    • 当需要两个动画的时候，会执行后面一个，解决办法如下，回调函数
    • 当需要两个以上的时候，需要考虑是否可写一行代码变换多个属性
    • 变换不一致的时候，定时器被提前清除

在线演示

1.2.3 运动速度之封装2–增加opacity
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<div id="ball"></div>
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#ball {
position: relative;
left: 0;
top: 0;
width: 100px;
height: 100px;
background: blue;
opacity: 1;
}
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var ball = document.getElementById("ball");
ball.onmouseover = function(){
move(ball,{"width":300,"height":300,"opacity":0.3});
}
// ball.onmouseout = function(){
// move(ball,{"width":100,"height":100},-10);
// }
function move(obj,json){
clearInterval(obj.timer);
var mark = true;
obj.timer = setInterval(function(){
for(var attr in json){
var curr = null;
var target = json[attr];
var speed = null;
if(attr == "opacity"){
curr = getStyle(obj,attr)*100;
speed = (target*100-curr)*0.15;
}else {
curr = parseInt(getStyle(obj,attr));
speed = (target - curr)*0.15;
}
speed = speed>0 ? Math.ceil(speed):Math.floor(speed);
if(curr != target){
if(attr == "opacity"){
obj.style[attr] = (curr+speed)/100;
}else {
obj.style[attr] = curr+speed+"px";
}
 
mark = false;
}
}
if(mark){
clearInterval(obj.timer);
}
},1000/30);
}
 
 
function getStyle(obj,attr){
return getComputedStyle(obj)[attr]?getComputedStyle(obj)[attr]:obj.currentStyle[attr];
}

在线演示

  • 需要注意的地方
    • 当需要两个动画的时候，会执行后面一个，解决办法如下，回调函数
    • 当需要两个以上的时候，需要考虑是否可写一行代码变换多个属性
    • 变换不一致的时候，定时器被提前清除
    • 速度speed不要写死

1.3 运动框架之应用

1.3.1 分享按钮
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<div id="ball"></div>
<div id="box1">
<div id="box2">分享到</div>
</div>
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var box1 = document.getElementById("box1");
var ball = document.getElementById("ball");
 
box1.onmouseover = function(){
move(this,"left",0,10);
}
box1.onmouseout = function(){
move(this,"left",-100,-10);
}
//问题一：当需要两个动画的时候，会执行后面一个，解决办法如下，回调函数
ball.onmouseover = function(){
//同时变换 用的最多
//move(this,"width",500,10);
//move(this,"height",500,10);
//列队在执行
move(ball,"width",500,10,function(){
move(ball,"height",500,10);
});
}
ball.onmouseout = function(){
//move(this,"width",100,-10);
//move(this,"height",100,-10);
move(ball,"width",100,-10,function(){
move(ball,"height",100,-10);
});
}
var timer = null;
function move(obj,attr,target,speed,callback){
clearInterval(timer); //obj.timer缓存到各自的obj下
timer = setInterval(function(){
var curr = parseInt(getStyle(obj,attr));
if(curr == target){
clearInterval(timer);
callback && callback();
}else {
obj.style[attr] = curr+speed+"px";
}
},1000/30);
}
 
 
 
 
function getStyle(obj,attr){
return getComputedStyle(obj)[attr]?getComputedStyle(obj)[attr]:obj.currentStyle[attr];
}

在线演示

1.3.2运动框架之轮播图应用
1.3.2.1 焦点轮播–左右-无缝-速度版实现
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<div id="box">
<ul id="imgBox">
<li>![](http://upload-images.jianshu.io/upload_images/1480597-c72819402fb928e8.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)</li>
<li>![](http://upload-images.jianshu.io/upload_images/1480597-6830ca74fe1e6fcd.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)</li>
<li>![](http://upload-images.jianshu.io/upload_images/1480597-5d38376e63ffd0b0.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)</li>
<li>![](http://upload-images.jianshu.io/upload_images/1480597-2aa932ffbba4091e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)</li>
<li>![](http://upload-images.jianshu.io/upload_images/1480597-c72819402fb928e8.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)</li>
</ul>
<ol id="btn">
<li class="active">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ol>
</div>
<script src="http://7xq6al.com1.z0.glb.clouddn.com/Animate.min.js"></script>
<script type="text/javascript">
var box = document.querySelector("#box");
var imgUl = document.querySelector("#imgBox");
var btns = document.querySelector("#btn").querySelectorAll("li");
var len = btns.length;
var lenImg = imgUl.querySelectorAll("li").length;
var index = 0; //控制img的索引
var cindex = 0;//控制按钮的索引
var timer = null;
 
for (var i=0;i<len;i++) {
(function(index){
btns[index].onmouseover = function(){
for (var j=0;j<len;j++){
btns[j].className = "";
}
cindex = index;//保持索引同步
animateSpeed(imgUl,{"left":-970*index});
this.className = "active";
}
})(i);
}
function autoPlay(){
index++;
cindex++;
cindex %=len;//限制长度
for (var j=0;j<len;j++){
btns[j].className = "";
}
animateSpeed(imgUl,{"left":-970*index},function(){
 
if(index == lenImg-1){
this.style.left = 0;
index = 0;
}
});
btns[cindex].className = "active";
}
timer = setInterval(autoPlay,2000);
box.onmouseover = function(){
clearInterval(timer);
}
box.onmouseout = function(){
timer = setInterval(autoPlay,2000);
}
</script>
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*{
padding: 0;
margin: 0;
}
body{
font-size: 14px;
font-family: "微软雅黑";
}
ul,li{
list-style: none;
}
#box {
position: relative;
width: 970px;
height: 350px;
margin: 30px auto;
overflow: hidden;
}
#imgBox {
width:1000%;/*自动计算百分比*/
position: absolute;
left: 0;
}
#imgBox li{
width: 970px;
height: 350px;
float: left;
}
 
#imgBox li img {
width: 970px;
height: 350px;
}
#btn {
width: 120px;
position: absolute;
right: 10px;
bottom: 10px;
}
#btn li {
width: 20px;
height: 20px;
line-height: 20px;
border-radius: 50%;
text-align: center;
cursor: pointer;
background: #fff;
margin: 0 2px;
float: left;
}
#btn li.active {
background: #F17A5C;
color: #fff;
}
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//速度版本
(function(win){
function move(obj,json,callback){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var mark = true;
for(var attr in json){
var cur = null;
if(attr == "opacity"){
cur = getStyle(obj,attr)*100;
}else{
//如果没写 默认填充成0
cur = parseInt(getStyle(obj,attr))||0;
}
var target = json[attr];
var speed = (target - cur)*0.2;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(cur != target){
if(attr == "opacity"){
//IE opacity兼容问题
obj.style.filter = "alpha(opacity="+(cur+speed)+")";
obj.style[attr] = (cur + speed)/100;
}else{
obj.style[attr] = cur + speed + "px";
}
mark = false;
 
};
}
if(mark){
clearInterval(obj.timer);
callback && callback.call(obj);
}
},1000/30);
}
win.animateSpeed = move;
})(window);
 
 
function getStyle(obj,attr){
return getComputedStyle(obj)[attr]?getComputedStyle(obj)[attr]:obj.currentStyle[attr];
}
 
function getId(id){
return document.getElementById(id);
}

二、JavaScript运动框架之时间版

2.1 关于运动

  • 速度的运动 通过速度来控制元素的 位移 / 折叠 / 淡入淡出
  • 时间的运动 通过时间来控制元素的 位移 / 折叠 / 淡入淡出(jQuery)
  • 时间的运动 基于一些数学公式 匀速运动 在路程的每一个点 速度都一样
2.2 一些案例演示

2.3 运动框架之时间版本-借助animate一些函数实现–综合完整版

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<div id="box2"></div>
<div id="box3"></div>
<div id="box4"></div>
<div id="box5"></div>
<script type="text/javascript">
 
//时间版本
getId("box2").onclick = function(){
animateTime(getId("box2"),{
"left":500,
"opacity":100
},1000,"elasticOut",function(){
this.innerhtml = "我是时间版本";
});
}
getId("box3").onclick = function(){
animateTime(getId("box3"),{
"left":500,
"opacity":100
},1000,"backIn",function(){
this.innerHTML = "我是时间版本";
});
}
getId("box4").onclick = function(){
animateTime(getId("box4"),{
"left":500,
"opacity":100
},1000,"bounceIn",function(){
this.innerHTML = "我是时间版本";
});
}
getId("box5").onclick = function(){
animateTime(getId("box5"),{
"left":500,
"opacity":100
},1000,"bounceBoth",function(){
this.innerHTML = "我是时间版本";
});
}
 
 
 
</script>
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#box1,#box2,#box3,#box4,#box5 {
position: relative;
width: 100px;
height: 100px;
line-height: 100px;
text-align: center;
background: red;
color: #fff;
font-size: 12px;
opacity: 0.5;
filter:alpha(opcity=20);/**兼容IE*/
margin: 10px;
 
}
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/*t b c d
t current time :nTime-sTime
b begining time :curr
c chang in value :变化量end-curr
d duration :持续时间 time */
/**
*
* @param {Object} obj 元素对象
* @param {Object} json 多个属性
* @param {Object} time 变化时间
* @param {Object} prop 运动函数
* @param {Object} callback 回调函数
*/
//时间版本
(function(win){
function move(obj,json,time,prop,callback){
//一般定时器结束后最好清除
clearInterval(obj.timer);
var curr = {};
var end = {};
//通过for in 在上车前把所有东西装到包里
for(var attr in json){
if(attr == "opacity"){//opacity特殊东西特殊对待
curr[attr] = getStyle(obj,attr)*100;//化为整数好计算
}else{
curr[attr] = parseInt(getStyle(obj,attr))||0;
}
end[attr] = json[attr];
 
}
 
 
//如果没写默认值 默认就是0 不然在IE出问题
//var curr = parseInt(getStyle(obj,attr))||0;
//var end = target;
var sTime = new Date();//开始时间T0
//开始变换了
obj.timer = setInterval(function(){
var nTime = new Date();//当前时间Tt
var t = nTime -sTime;
var d = time;
//St = (Tt-T0)/Time*(S-S0)+S0
//(nTime-sTime)/time 比例最多为1
/*var prop = (nTime-sTime)/time; */
if(t >=d){
t = d;
clearInterval(obj.timer);
callback && callback.call(obj);
}
for(var attr in json){
var b = curr[attr];
var c = end[attr] - b;
if(attr == "opacity"){
//var s = prop*(end[attr]-curr[attr])+curr[attr];
var s = Tween[prop](t,b,c,d);
obj.style[attr] = s/100;
obj.style.filter = "alpha(opacity="+s+")";
}else{
//var s = prop*(end[attr]-curr[attr])+curr[attr];
var s = Tween[prop](t,b,c,d);
obj.style[attr] = s+"px";
}
 
}
 
 
},13);
var Tween = {
linear: function (t, b, c, d){ //匀速
return c*t/d + b; // t/d = prop;
},
easeIn: function(t, b, c, d){ //加速曲线
return c*(t/=d)*t + b;
},
easeOut: function(t, b, c, d){ //减速曲线
return -c *(t/=d)*(t-2) + b;
},
easeBoth: function(t, b, c, d){ //加速减速曲线
if ((t/=d/2) < 1) {
return c/2*t*t + b;
}
return -c/2 * ((--t)*(t-2) - 1) + b;
},
easeInStrong: function(t, b, c, d){ //加加速曲线
return c*(t/=d)*t*t*t + b;
},
easeOutStrong: function(t, b, c, d){ //减减速曲线
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easeBothStrong: function(t, b, c, d){ //加加速减减速曲线
if ((t/=d/2) < 1) {
return c/2*t*t*t*t + b;
}
return -c/2 * ((t-=2)*t*t*t - 2) + b;
},
elasticIn: function(t, b, c, d, a, p){ //正弦衰减曲线（弹动渐入）
if (t === 0) {
return b;
}
if ( (t /= d) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
if (!a || a < Math.abs(c)) {
a = c;
var s = p/4;
} else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
},
elasticOut: function(t, b, c, d, a, p){ //正弦增强曲线（弹动渐出）
if (t === 0) {
return b;
}
if ( (t /= d) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
if (!a || a < Math.abs(c)) {
a = c;
var s = p / 4;
} else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
},
elasticBoth: function(t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d/2) == 2 ) {
return b+c;
}
if (!p) {
p = d*(0.3*1.5);
}
if ( !a || a < Math.abs(c) ) {
a = c;
var s = p/4;
}
else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
if (t < 1) {
return - 0.5*(a*Math.pow(2,10*(t-=1)) *
Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
}
return a*Math.pow(2,-10*(t-=1)) *
Math.sin( (t*d-s)*(2*Math.PI)/p )*0.5 + c + b;
},
backIn: function(t, b, c, d, s){ //回退加速（回退渐入）
if (typeof s == ‘undefined‘) {
s = 1.70158;
}
return c*(t/=d)*t*((s+1)*t - s) + b;
},
backOut: function(t, b, c, d, s){
if (typeof s == ‘undefined‘) {
s = 3.70158; //回缩的距离
}
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},
backBoth: function(t, b, c, d, s){
if (typeof s == ‘undefined‘) {
s = 1.70158;
}
if ((t /= d/2 ) < 1) {
return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
}
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
},
bounceIn: function(t, b, c, d){ //弹球减振（弹球渐出）
return c - Tween[‘bounceOut‘](d-t, 0, c, d) + b;
},
bounceOut: function(t, b, c, d){
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;
}
return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;
},
bounceBoth: function(t, b, c, d){
if (t < d/2) {
return Tween[‘bounceIn‘](t*2, 0, c, d) * 0.5 + b;
}
return Tween[‘bounceOut‘](t*2-d, 0, c, d) * 0.5 + c*0.5 + b;
}
};
}
win.animateTime = move;
})(window);

在线演示

三、运动框架之时间速度版完整封装

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/*t b c d
t current time :nTime-sTime
b begining time :curr
c chang in value :变化量end-curr
d duration :持续时间 time */
/**
*
* @param {Object} obj 元素对象
* @param {Object} json 多个属性
* @param {Object} time 变化时间
* @param {Object} prop 运动函数
* @param {Object} callback 回调函数
*/
//时间版本
(function(win){
function move(obj,json,time,prop,callback){
//一般定时器结束后最好清除
clearInterval(obj.timer);
var curr = {};
var end = {};
//通过for in 在上车前把所有东西装到包里
for(var attr in json){
if(attr == "opacity"){//opacity特殊东西特殊对待
curr[attr] = getStyle(obj,attr)*100;//化为整数好计算
}else{
curr[attr] = parseInt(getStyle(obj,attr))||0;
}
end[attr] = json[attr];
 
}
 
 
//如果没写默认值 默认就是0 不然在IE出问题
//var curr = parseInt(getStyle(obj,attr))||0;
//var end = target;
var sTime = new Date();//开始时间T0
//开始变换了
obj.timer = setInterval(function(){
var nTime = new Date();//当前时间Tt
var t = nTime -sTime;
var d = time;
//St = (Tt-T0)/Time*(S-S0)+S0
//(nTime-sTime)/time 比例最多为1
/*var prop = (nTime-sTime)/time; */
if(t >=d){
t = d;
clearInterval(obj.timer);
callback && callback.call(obj);
}
for(var attr in json){
var b = curr[attr];
var c = end[attr] - b;
if(attr == "opacity"){
//var s = prop*(end[attr]-curr[attr])+curr[attr];
var s = Tween[prop](t,b,c,d);
obj.style[attr] = s/100;
obj.style.filter = "alpha(opacity="+s+")";
}else{
//var s = prop*(end[attr]-curr[attr])+curr[attr];
var s = Tween[prop](t,b,c,d);
obj.style[attr] = s+"px";
}
 
}
 
 
},13);
var Tween = {
linear: function (t, b, c, d){ //匀速
return c*t/d + b; // t/d = prop;
},
easeIn: function(t, b, c, d){ //加速曲线
return c*(t/=d)*t + b;
},
easeOut: function(t, b, c, d){ //减速曲线
return -c *(t/=d)*(t-2) + b;
},
easeBoth: function(t, b, c, d){ //加速减速曲线
if ((t/=d/2) < 1) {
return c/2*t*t + b;
}
return -c/2 * ((--t)*(t-2) - 1) + b;
},
easeInStrong: function(t, b, c, d){ //加加速曲线
return c*(t/=d)*t*t*t + b;
},
easeOutStrong: function(t, b, c, d){ //减减速曲线
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easeBothStrong: function(t, b, c, d){ //加加速减减速曲线
if ((t/=d/2) < 1) {
return c/2*t*t*t*t + b;
}
return -c/2 * ((t-=2)*t*t*t - 2) + b;
},
elasticIn: function(t, b, c, d, a, p){ //正弦衰减曲线（弹动渐入）
if (t === 0) {
return b;
}
if ( (t /= d) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
if (!a || a < Math.abs(c)) {
a = c;
var s = p/4;
} else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
},
elasticOut: function(t, b, c, d, a, p){ //正弦增强曲线（弹动渐出）
if (t === 0) {
return b;
}
if ( (t /= d) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
if (!a || a < Math.abs(c)) {
a = c;
var s = p / 4;
} else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
},
elasticBoth: function(t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d/2) == 2 ) {
return b+c;
}
if (!p) {
p = d*(0.3*1.5);
}
if ( !a || a < Math.abs(c) ) {
a = c;
var s = p/4;
}
else {
var s = p/(2*Math.PI) * Math.asin (c/a);
}
if (t < 1) {
return - 0.5*(a*Math.pow(2,10*(t-=1)) *
Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
}
return a*Math.pow(2,-10*(t-=1)) *
Math.sin( (t*d-s)*(2*Math.PI)/p )*0.5 + c + b;
},
backIn: function(t, b, c, d, s){ //回退加速（回退渐入）
if (typeof s == ‘undefined‘) {
s = 1.70158;
}
return c*(t/=d)*t*((s+1)*t - s) + b;
},
backOut: function(t, b, c, d, s){
if (typeof s == ‘undefined‘) {
s = 3.70158; //回缩的距离
}
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},
backBoth: function(t, b, c, d, s){
if (typeof s == ‘undefined‘) {
s = 1.70158;
}
if ((t /= d/2 ) < 1) {
return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
}
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
},
bounceIn: function(t, b, c, d){ //弹球减振（弹球渐出）
return c - Tween[‘bounceOut‘](d-t, 0, c, d) + b;
},
bounceOut: function(t, b, c, d){
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;
}
return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;
},
bounceBoth: function(t, b, c, d){
if (t < d/2) {
return Tween[‘bounceIn‘](t*2, 0, c, d) * 0.5 + b;
}
return Tween[‘bounceOut‘](t*2-d, 0, c, d) * 0.5 + c*0.5 + b;
}
};
}
win.animateTime = move;
})(window);
 
 
//速度版本
(function(win){
function move(obj,json,callback){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var mark = true;
for(var attr in json){
var cur = null;
if(attr == "opacity"){
cur = getStyle(obj,attr)*100;
}else{
//如果没写 默认填充成0
cur = parseInt(getStyle(obj,attr))||0;
}
var target = json[attr];
var speed = (target - cur)*0.2;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(cur != target){
if(attr == "opacity"){
//IE opacity兼容问题
obj.style.filter = "alpha(opacity="+(cur+speed)+")";
obj.style[attr] = (cur + speed)/100;
}else{
obj.style[attr] = cur + speed + "px";
}
mark = false;
 
};
}
if(mark){
clearInterval(obj.timer);
callback && callback.call(obj);
}
},1000/30);
}
win.animateSpeed = move;
})(window);
 
 
function getStyle(obj,attr){
return getComputedStyle(obj)[attr]?getComputedStyle(obj)[attr]:obj.currentStyle[attr];
}
 
function getId(id){
return document.getElementById(id);
}

 

from：http://blog.poetries.top/2017/01/12/js-animate/?utm_source=tuicool&utm_medium=referral

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