在使用Google+的时候，查看某一相册，会经常看到，如下图所示的动画效果。
鼠标移入、移出时均有动画效果，咋一看估计是使用了css3的transform属性来实现动画效果的。
在网上搜索“Google+ 相册 效果”的时候发现有人使用CSS3做了这样的效果，不过使用调试工具查看节点元素的时候，我觉得它是使用JS在进行的控制。所以就用JS顺手写了一个，只是demo，可能还需要改进。
实例暂时仅支持较新版本的：Chrome、Safari、Firefox、Opera（其中Safari动画感觉不太流畅，所有浏览器中Chrome表现最好），示例请使用上述浏览器进行访问，演示地址>>
代码旋转的坐标值都是写死的，而google+里应该是算出来的，这里没有引用其它的js库/框架，代码不算多，思路算比较简单的（有优化的空间，有空封装和折腾一下）。
完整的示例代码：
<!DOCTYPE html>
<html>
<head>
<title>Google+相册展示</title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta http-equiv='content-type' content='text/html; charset=utf-8' />
<style type='text/css'>
.pw{position:relative;vertical-align:top}
.pw:active{outline:0}
.rK{-webkit-box-shadow:0 1px 2px #aaa;-moz-box-shadow:0 1px 2px #aaa;box-shadow:0 1px 2px #aaa;background-color:#fff;border:5px solid #f3f3f3;cursor:pointer}
.uK{-webkit-box-shadow:1px 1px 2px #666;-moz-box-shadow:1px 1px 2px #666;box-shadow:1px 1px 2px #666;left:0;position:absolute;top:0}
.vK{z-index:4}
.wK{transform:translate(5px,1px) scale(.97);z-index:3;-moz-transform:translate(5px,1px) scale(.97);-o-transform:translate(5px,1px) scale(.97);-webkit-transform:translate(5px,1px) scale(.97)}
.xK{transform:translate(10px,2px) scale(.94);z-index:2;-moz-transform:translate(10px,2px) scale(.94);-o-transform:translate(10px,2px) scale(.94);-webkit-transform:translate(10px,2px) scale(.94)}
.yK{z-index:1}
.pw img {width:205px; height:205px;}
#tipInfo {padding-left:20px;}
#picContainer {width: 227px; position: absolute; z-index: 5; display:none;}
</style>
</head>
<body>
<button onclick="openAnim()">执行显示动画</button>
<button onclick="closeAnim()">执行关于动画</button>
<span id="tipInfo"></span>
<div class="pw" style="width: 227px; -webkit-user-select: none; margin:120px;" tabindex="0" id="picList">
<img class="rK uK vK" src="http://1.meteoric.sinaapp.com/images/IMG_0506.jpg" />
<img class="rK uK wK" src="http://1.meteoric.sinaapp.com/images/IMG_0516.jpg" />
<img class="rK uK xK" src="http://1.meteoric.sinaapp.com/images/IMG_0548.jpg" />
<img class="rK uK yK" src="http://1.meteoric.sinaapp.com/images/IMG_0506.jpg" />
</div>
<div class="pw" id="picContainer">
<img class="rK uK vK" src="http://1.meteoric.sinaapp.com/images/IMG_0506.jpg" />
<img class="rK uK wK" src="http://1.meteoric.sinaapp.com/images/IMG_0516.jpg" />
<img class="rK uK xK" src="http://1.meteoric.sinaapp.com/images/IMG_0548.jpg" />
<img class="rK uK yK" src="http://1.meteoric.sinaapp.com/images/IMG_0506.jpg" />
</div>
<script type="text/javascript">
1:
2: //style="-webkit-transform: rotate(-6deg) translate(-72px, -4px) scale(1.0414634146341464); "
3:
4: function getEl(id) {
5: return typeof id === "string" ? document.getElementById(id) : id;
6: }
7: /**
8: * @fileoverview Tween
9: */
10: function Tween(C, B, A) {
11: if (C) {
12: this.time = parseInt(C * 1000)
13: }
14: if (B) {
15: this.transform = B
16: }
17: if (A) {
18: this.interval = A
19: }
20: }
21: Tween.prototype = {
22: interval: 40,
23: duration: 1000,
24: transform: function(A) {
25: return 1 - Math.pow(1 - A, 3)
26: },
27: timer: null,
28: isRun: false,
29: clear: function() {
30: if (this.timer) {
31: clearInterval(this.timer);
32: this.timer = null;
33: }
34: },
35: start: function() {
36: this.clear();
37:
38: this.timer = this._start.apply(this, arguments);
39: },
40: _start : function(A, E, D) {
41:
42: D = D || this.transform;
43:
44: function H() {
45: I += C;
46: var J = I / F;
47: if (J >= 1) {
48: A(1);
49: E && E();
50: clearInterval(B)
51: } else {
52: A(D(J) / G)
53: }
54: }
55:
56: var C = this.interval;
57: var F = this.duration;
58: var G = D(1);
59: var I = 0;
60: var B = setInterval(H, C);
61:
62: return B;
63: }
64: }
65:
66: function getOffset(el) {
67: var elem = getEl(el);
68: var l = 0;
69: var t = 0;
70:
71: while (elem) {
72: l += elem.offsetLeft;
73: t += elem.offsetTop;
74:
75: elem = elem.offsetParent;
76: }
77:
78: return [l, t];
79: }
80:
81: var tween = new Tween();
82: var imgArr = getEl("picContainer").getElementsByTagName("img");
83: var ua = navigator.userAgent;
84: var isWebkit = /AppleWebKit/.test(ua);
85: var isFF = /Firefox/.test(ua);
86: var isOpera = /Opera/.test(ua);
87:
88: tween.duration = 300;
89:
90: function openAnim() {
91: getEl("tipInfo").innerHTML = "";
92: getEl("picContainer").style.display = "block";
93:
94: function M(I) {
95: var a = isWebkit ? "WebkitTransform" : "MozTransform";
96: a = isOpera ? "OTransform" : a;
97:
98: imgArr[0].style[a] = "rotate("+ -6 * I +"deg) translate("+ -72 * I +"px, "+ -4 * I +"px) scale(1)";
99: imgArr[1].style[a] = "rotate(0deg) translate(0px, "+ -4 * I +"px) scale(1)";
100: imgArr[2].style[a] = "rotate("+ 6 * I +"deg) translate("+ 72 * I +"px, "+ 4 * I +"px) scale(1)";
101:
102: getEl("tipInfo").innerHTML = "显示动画正在执行...";
103: }
104:
105: function N() {
106: getEl("tipInfo").innerHTML = "显示动画执行完成";
107:
108: getEl("picContainer").onmouseout = closeAnim;
109: getEl("picList").onmouseover = null;
110:
111: getEl("picContainer").onmousemove = function() {
112: tween.clear();
113: }
114: }
115:
116: tween.start(M, N);
117: }
118:
119: function closeAnim() {
120: getEl("tipInfo").innerHTML = "";
121:
122: function M(I) {
123: I = 1 - I;
124:
125: var a = isWebkit ? "WebkitTransform" : "MozTransform";
126: a = isOpera ? "OTransform" : a;
127:
128: imgArr[0].style[a] = "rotate("+ -6 * I +"deg) translate("+ -72 * I +"px, "+ -4 * I +"px) scale(1)";
129: imgArr[1].style[a] = "rotate(0deg) translate("+(5 - 5 * I)+"px, "+ (1 + -5 * I) +"px) scale(0.97)";
130: imgArr[2].style[a] = "rotate("+ 6 * I +"deg) translate("+ (10 + 62 * I) +"px, "+ (2 + 2 * I) +"px) scale(0.94)";
131:
132: getEl("tipInfo").innerHTML = "关闭动画正在执行...";
133: }
134:
135: function N() {
136: getEl("tipInfo").innerHTML = "关闭动画执行完成";
137:
138: getEl("picContainer").style.display = "none";
139:
140: getEl("picContainer").onmouseout = null;
141: getEl("picList").onmouseover = openAnim;
142: getEl("picContainer").onmousemove = null;
143: }
144:
145: tween.start(M, N);
146: }
147:
148: !(function() {
149: var arr = getOffset("picList");
150: var elem = getEl("picContainer");
151:
152: elem.style.left = arr[0] + 'px';
153: elem.style.top = arr[1] + 'px';
154:
155: if (!isWebkit && !isFF && !isOpera) {
156: var btns = document.getElementsByTagName("button");
157: for (var i = 0, len = btns.length; i < len; i++) {
158: btns[i].disabled = true;
159: }
160: } else {
161: getEl("picList").onmouseover = openAnim;
162: }
163: })();
164:
</
script
>
</ body >
</ html >
