JS每日一题-小demo之JS实现通过键盘方向键操作图片上下左右无缝切换

!DOCTYPE htML>
    html>
    head>
    meta charset="UTF-8">
    tITle>
    Document/title>
    style type="text/css">
.wrap {
    margin: 150px auto;
    position: relative;
    width: 400px;
    height: 300px;
    overflow: hidden;
    border: 2px solid #000;
}
 .wrap img {
    position: absolute;
}
    /style>
    /head>
    body>
    p>
    img src="pic/1.jpg" style="left:0;
    top:0" />
    img src="pic/2.jpg" style="left:0;
    top:100%" />
    /p>
    script type="text/javascript" src="js/startmove.js?1.1.10">
    /script>
    script type="text/javascript">
(function(){
    VAR data = ["pic/1.jpg","pic/2.jpg","pic/3.jpg","pic/4.jpg"];
    var img = document.querySelectorAll('img');
    var now = 0;
    var next = 0;
    var imgW = css(img[0],"width");
    var imgH = css(img[0],"height");
    var isMove = false;
document.addEventListener('keyup', function(e) {
if(isMove){
    return;
}
switch(e.keyCode){
    case 37://向左toLeft();
    break;
    case 38://向上toUp();
    break;
    case 39://向右toRight();
    break;
    case 40://向下toDown();
    break;
 }
}
    );
function toLeft(){
    next = (now + 1)%data.length;
init([0,0,0,imgW],{
left:-imgW}
,{
left:0}
    );
}
function toUp(){
    next = (now + 1)%data.length;
init([0,0,imgH,0],{
top:-imgH}
,{
top:0}
    );
}
function toRight(){
    next = (now - 1 + data.length)%data.length;
init([0,0,0,-imgW],{
left:imgW}
,{
left:0}
    );
}
function toDown(){
    next = (now - 1 + data.length)%data.length;
init([0,0,-imgH,0],{
top:imgH}
,{
top:0}
    );
}
    // styles = [0,0,0,0];
// target1 {
}
//init 初始位置function init(styles,target1,target2){
    isMove = true;
    img[0].src= data[now];
    img[1].src= data[next];
    css(img[0],"top",styles[0]);
    css(img[0],"left",styles[1]);
    css(img[1],"top",styles[2]);
    css(img[1],"left",styles[3]);
    now = next;
    move(img[0],target1);
move(img[1],target2,function(){
    isMove = false;
}
    );
}
// 移动function move(el,target,callBack){
startMove({
el:el,target:target,type: "easeOut",time: 1000}
    );
}
}
    )();
     /script>
    /body>
    /html>
//动画形式公式var Tween = {
linear: function (t, b, c, d){
    return c*t/d + b;
}
,easeIn: function(t, b, c, d){
    return c*(t/=d)*t + b;
}
,easeOut: function(t, b, c, d){
    return -c *(t/=d)*(t-2) + b;
}
,easeBoth: function(t, b, c, d){
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){
    return c*(t/=d)*t*t*t + b;
}
,easeOutStrong: function(t, b, c, d){
    return -c * ((t=t/d-1)*t*t*t - 1) + b;
}
,easeBothStrong: function(t, b, c, d){
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){
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){
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){
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 = 2.70158;
  //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){
    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;
}
}
// 获取或者设置样式function css(el,attr,val){
if(arguments.length == 2){
if(el.currentStyle){
    val = el.currentStyle[attr];
}
 else {
    val = getComputedStyle(el)[attr];
}
    return parseFloat(val);
}
 else {
if(attr == "opacity"){
    el.style.opacity = val;
    el.style.filter = "alpha(opacity= "+val*100+")";
}
 else if(attr == "zIndex"){
    el.style[attr] = Math.round(val);
}
else {
    el.style[attr] = val + "px";
}
}
}
//执行动画function startMove(init){
    clearInterval(init.el.timer);
    var t = 0;
 var b = {
}
    ;
var c = {
}
    ;
    var d = init.time/20;
for( var s in init.target){
     b[s] = css(init.el,s);
    c[s] = init.target[s] - b[s];
}
 init.el.timer = setInterval(function(){
    t++;
    if(t >
 d){
    clearInterval(init.el.timer);
    init.callBack&
    &
    init.callBack();
}
 else {
for(var s in init.target){
    var val = Tween[init.type](t,b[s],c[s],d);
    css(init.el,s,val);
}
}
}
    ,20);
}
    

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