看到楼下有个哥们说动画有问题，按照他这种方式去修改动画是回复了，我就很奇怪，看了下初始化图片的位置css，position后，left了50%，然后左移了50%，造成了动画一半的效果，将left改为0，并且左移的动画删掉，动画就正常了，希望能够帮到耐心看评论的朋友。。。
问题及答案。
给您参考下我修改后的代码，经测试动画比较流畅：
<!DOCTYPE html>
<html lang="en">
<link rel="stylesheet" href="demo.css">
<head>
<meta charset="UTF-8">
<title>box-sizing</title>
<style>
@importurl("http://www.w3cplus.com/demo/css3/base.css");
@importurl("http://fonts.googleapis.com/css?family=Yesteryear");
html,
body {
height: 100%;
}
/*设置背景图片全屏显示，并且居中*/
img.bg {
min-height: 100%;
min-width: 1024px;
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
z-index:1;
}
/*设置背景图片从左向右移入显示的动画效果*/
/* Slide Left */
@-webkit-keyframes slideLeft {
0% { left: -10%; }
100% { left: 0; }
}
@-moz-keyframes slideLeft {
0% { left: -500px; }
100% { left: 0; }
}
@-o-keyframes slideLeft {
0% { left: -500px; }
100% { left: 0; }
}
@-ms-keyframes slideLeft {
0% { left: -500px; }
100% { left:1000px;}
}
@keyframes slideLeft {
0% { left: -100%; }
100% { left: 0; }
}
/*设置背景图像从底部向顶部移入的动画效果*/
/* Slide Bottom */
@-webkit-keyframes slideBottom {
0% { top: 350px; }
100% { top: 0; }
}
@-moz-keyframes slideBottom {
0% { top: 350px; }
100% { top: 0; }
}
@-ms-keyframes slideBottom {
0% { top: 350px; }
100% { top: 0; }
}
@-o-keyframes slideBottom {
0% { top: 350px; }
100% { top: 0; }
}
@keyframes slideBottom {
0% { top: 350px; }
100% { top: 0; }
}
/*设置背景图片由小到大放大动画效果*/
/* Zoom In */
@-webkit-keyframes zoomIn {
0% { -webkit-transform: scale(0.1); }
100% { -webkit-transform: none; }
}
@-moz-keyframes zoomIn {
0% { -moz-transform: scale(0.1); }
100% { -moz-transform: none; }
}
@-ms-keyframes zoomIn {
0% { -ms-transform: scale(0.1); }
100% { -ms-transform: none; }
}
@-o-keyframes zoomIn {
0% { -o-transform: scale(0.1); }
100% { -o-transform: none; }
}
@keyframes zoomIn {
0% { transform: scale(0.1); }
100% { transform: none; }
}
/*设置背景图像由大到小缩小动画效果*/
/* Zoom Out */
@-webkit-keyframes zoomOut {
0% { -webkit-transform: scale(2); }
100% { -webkit-transform: none; }
}
@-moz-keyframes zoomOut {
0% { -moz-transform: scale(2); }
100% { -moz-transform: none; }
}
@-ms-keyframes zoomOut {
0% { -ms-transform: scale(2); }
100% { -ms-transform: none; }
}
@-o-keyframes zoomOut {
0% { -o-transform: scale(2); }
100% { -o-transform: none; }
}
@keyframes zoomOut {
0% { transform: scale(2); }
100% { transform: none; }
}
/*背景图像旋转出现动画效果*/
/* Rotate */
@-webkit-keyframes rotate {
0% { -webkit-transform: rotate(-360deg) scale(0.1); }
100% { -webkit-transform: none; }
}
@-moz-keyframes rotate {
0% { -moz-transform: rotate(-360deg) scale(0.1); }
100% { -moz-transform: none; }
}
@-ms-keyframes rotate {
0% { -ms-transform: rotate(-360deg) scale(0.1); }
100% { -ms-transform: none; }
}
@-o-keyframes rotate {
0% { -o-transform: rotate(-360deg) scale(0.1); }
100% { -o-transform: none; }
}
@keyframes rotate {
0% { transform: rotate(-360deg) scale(0.1); }
100% { transform: none; }
}
/*设置背景图像不显示动画效果*/
@-webkit-keyframes notTarget {
0% { z-index: 75; }
100% { z-index: 75; }
}
@-moz-keyframes notTarget {
0% { z-index: 75; }
100% { z-index: 75; }
}
@-ms-keyframes notTarget {
0% { z-index: 75; }
100% { z-index: 75; }
}
@-o-keyframes notTarget {
0% { z-index: 75; }
100% { z-index: 75; }
}
@keyframes notTarget {
0% { z-index: 75; }
100% { z-index: 75; }
}
.slider {
position: absolute;
width: 100%;
text-align: center;
z-index: 9999;
bottom: 100px;
}
.slider li {
display: inline-block;
width: 170px;
height: 130px;
margin-right: 15px;
}
.slider a {
display: inline-block;
width: 170px;
padding-top: 70px;
padding-bottom: 20px;
position: relative;
cursor: pointer;
border: 2px solid #fff;
border-radius: 5px;
vertical-align: top;
color: #fff;
text-decoration: none;
font-size: 22px;
font-family: 'Yesteryear', cursive;
text-shadow: -1px -1px 1px rgba(0, 0, 0, 0.8),-2px -2px 1px rgba(0, 0, 0, 0.3),-3px -3px 1px rgba(0, 0, 0, 0.3);
}
/*任务一、设置不同列表的背景色*/
.slider li:nth-of-type(1) a{
background-color: #02646e;
}
.slider li:nth-of-type(2) a{
background-color: #eb0837;
}
.slider li:nth-of-type(3) a{
background-color: #67b374;
}
.slider li:nth-of-type(4) a{
background-color: #e6674a;
}
.slider li:nth-of-type(5) a{
background-color: #e61061;
}
/*任务二、设置缩略图形状*/
.slider li a:after{
content:"";
display: block;
height: 120px;
width: 120px;
border: 5px solid #fff;
border-radius: 50%;
position: absolute;
left: 50%;
margin-left: -60px;
z-index: 9999;
top: -80px;
}
/*任务三、设置缩略图背景图像*/
.slider li:nth-of-type(1) a:after{
background: url(images/13163193_145819676170_2.jpg) no-repeat center;
background-size: 120px 120px;
}
.slider li:nth-of-type(2) a:after{
background: url(images/200812308231244_2.jpg) no-repeat center;
background-size: 120px 120px;
}
.slider li:nth-of-type(3) a:after{
background: url(images/2013062320262198.jpg) no-repeat center;
background-size: 120px 120px;
}
.slider li:nth-of-type(4) a:after{
background: url(images/2014021221061938.jpg) no-repeat center;
background-size: 120px 120px;
}
.slider li:nth-of-type(5) a:after{
background: url(images/f03220aa5cc066bea0d4d2d355365f18.jpg) no-repeat center;
background-size: 120px 120px;
}
/*任务四、给缩略图添加蒙板效果*/
.slider li a:before{
content:"";
display: block;
height: 120px;
width: 120px;
border: 5px solid #fff;
border-radius: 50%;
position: absolute;
left: 50%;
margin-left: -60px;
z-index: 99999;
top: -80px;
background: rgba(0,0,0,0.3);
}
/*任务五、鼠标悬浮时，修改缩略图蒙板透明度*/
.slider li a:hover:before{
opacity:0;
}
/*任务六、点击综略图，切换背景图*/
/*背景图从左向右出现*/
#bg1:target{
z-index: 100;
-webkit-animation-name: slideLeft;
-webkit-animation-duration: 2s;
-webkit-animation-iteration-count: 1;
-webkit-animation-timing-function:ease-in-out;
-moz-animation-name: slideLeft;
-moz-animation-duration: 2s;
-moz-animation-iteration-count: 1;
-ms-animation-name: slideLeft;
-ms-animation-duration: 2s;
-ms-animation-iteration-count: 1;
-o-animation-name: slideLeft;
-o-animation-duration: 2s;
-o-animation-iteration-count: 1;
animation-name: slideLeft;
animation-duration: 2s;
animation-iteration-count: 1;
animation-timing-function:ease-in-out;
}
/*背景图从下向上出现*/
#bg2:target{
z-index: 100;
-webkit-animation-name: slideBottom;
-webkit-animation-duration: 1s;
-webkit-animation-iteration-count: 1;
-moz-animation-name: slideBottom;
-moz-animation-duration: 1s;
-moz-animation-iteration-count: 1;
-ms-animation-name: slideBottom;
-ms-animation-duration: 1s;
-ms-animation-iteration-count: 1;
-o-animation-name: slideBottom;
-o-animation-duration: 1s;
-o-animation-iteration-count: 1;
animation-name: slideBottom;
animation-duration: 1s;
animation-iteration-count: 1;
}
/*背景图由小到大出现*/
#bg3:target{
z-index: 100;
-webkit-animation-name: zoomIn;
-webkit-animation-duration: 1s;
-webkit-animation-iteration-count: 1;
-moz-animation-name: zoomIn;
-moz-animation-duration: 1s;
-moz-animation-iteration-count: 1;
-ms-animation-name: zoomIn;
-ms-animation-duration: 1s;
-ms-animation-iteration-count: 1;
-o-animation-name: zoomIn;
-o-animation-duration: 1s;
-o-animation-iteration-count: 1;
animation-name: zoomIn;
animation-duration: 1s;
animation-iteration-count: 1;
}
/*背景图由大到小出现*/
#bg4:target{
z-index: 100;
-webkit-animation-name: zoomOut;
-webkit-animation-duration: 1s;
-webkit-animation-iteration-count: 1;
-moz-animation-name: zoomOut;
-moz-animation-duration: 1s;
-moz-animation-iteration-count: 1;
-ms-animation-name: zoomOut;
-ms-animation-duration: 1s;
-ms-animation-iteration-count: 1;
-o-animation-name: zoomOut;
-o-animation-duration: 1s;
-o-animation-iteration-count: 1;
animation-name: zoomOut;
animation-duration: 1s;
animation-iteration-count: 1;
}
/*背景图旋转出现*/
#bg5:target{
z-index: 100;
-webkit-animation-name: rotate;
-webkit-animation-duration: 1s;
-webkit-animation-iteration-count: 1;
-moz-animation-name: rotate;
-moz-animation-duration: 1s;
-moz-animation-iteration-count: 1;
-ms-animation-name: rotate;
-ms-animation-duration: 1s;
-ms-animation-iteration-count: 1;
-o-animation-name: rotate;
-o-animation-duration: 1s;
-o-animation-iteration-count: 1;
animation-name: rotate;
animation-duration: 1s;
animation-iteration-count: 1;
}
/*任务七、设置不显示的背景图层级*/
/* Not Target */
img:not(:target){
-webkit-animation-name: notTarget;
-webkit-animation-duration: 1s;
-webkit-animation-iteration-count: 1;
-moz-animation-name: notTarget;
-moz-animation-duration: 1s;
-moz-animation-iteration-count: 1;
-ms-animation-name: notTarget;
-ms-animation-duration: 1s;
-ms-animation-iteration-count: 1;
-o-animation-name: notTarget;
-o-animation-duration: 1s;
-o-animation-iteration-count: 1;
animation-name: notTarget;
animation-duration: 1s;
animation-iteration-count: 1;
}
</style>
</head>
<body>
<div class="slider">
<ul class="clearfix">
<li><a href="#bg1">Hipster Fashion Haircut </a></li>
<li><a href="#bg2">Cloud Computing Services & Consulting</a></li>
<li><a href="#bg3">My haire is sooo fantastic!</a></li>
<li><a href="#bg4">Eat healthy & excersice!</a></li>
<li><a href="#bg5">Lips so kissable I could die ...</a></li>
</ul>
</div>
<img src="images/13163193_145819676170_2.jpg" alt="" class="bg slideLeft" id="bg1" />
<img src="images/200812308231244_2.jpg" alt="" class="bg slideBottom" id="bg2" />
<img src="images/2013062320262198.jpg" alt="" class="bg zoomIn" id="bg3" />
<img src="images/2014021221061938.jpg" alt="" class="bg zoomOut" id="bg4" />
<img src="images/f03220aa5cc066bea0d4d2d355365f18.jpg" alt="" class="bg rotate" id="bg5" />
</body>
</html>应该给动画在100%的时候设置他的right和bottom，使得动画向左移动最后的位置是右边距和第边距为零，设置动画结束时的位置比较好理解