侧栏工具栏

<div class="toolbar">
    <a href="javascript:;" class="toolbar-item toolbar-item-weixin">
        <span class="toolbar-layer"></span>
    </a>
    <a href="javascript:;" class="toolbar-item toolbar-item-feedback"></a>
    <a href="javascript:;" class="toolbar-item toolbar-item-app">
        <span class="toolbar-layer"></span>
    </a>
    <a href="javascript:;" class="toolbar-item toolbar-item-top"></a>
</div>

 1 .toolbar-item,.toolbar-layer{
 2     background-image: url("images/toolbar.png");
 3     background-repeat: no-repeat;
 4 }
 5 .toolbar{
 6     position: fixed;left: 50%;bottom: 5px;margin-left: -26px;
 7 }
 8 .toolbar-item{
 9     display: block;width: 52px;;height: 52px;
10     margin-top: 1px;position: relative;transition: background-position 1s;
11 }
12 .toolbar-item:hover .toolbar-layer{opacity: 1;filter: alpha(opacity=100);transform: scale(1)}
13 .toolbar-item-weixin{background-position: 0 -798px}
14 .toolbar-item-weixin:hover{background-position: 0 -860px}
15 .toolbar-item-weixin .toolbar-layer{height: 212px;background-position: 0 0}
16 .toolbar-item-feedback{background-position: 0 -426px}
17 .toolbar-item-feedback:hover{background-position: 0 -488px}
18 .toolbar-item-app{background-position: 0 -550px}
19 .toolbar-item-app:hover{background-position: 0 -612px}
20 .toolbar-item-app .toolbar-layer{height: 194px;background-position:0 -222px}
21 .toolbar-item-top{background-position: 0 -674px}
22 .toolbar-item-top:hover{background-position: 0 -736px}
23
24 .toolbar-layer{
25     position: absolute;
26     right: 52px;
27     bottom: -6px;
28     width: 172px;
29     background-image: url("images/toolbar.png");
30     background-repeat: no-repeat;
31     opacity: 0;
32     filter: alpha(opacity=0);
33     transform-origin: 95% 95%;
34     transform: scale(0.01);
35     transition: all 1s;
36 }

 1 .toolbar-item,.toolbar-layer{
 2     background-image: url("images/toolbar.png");
 3     background-repeat: no-repeat;
 4 }
 5 .toolbar{
 6     position: fixed;left: 50%;bottom: 5px;margin-left: -26px;
 7 }
 8 .toolbar-item{
 9     display: block;width: 52px;;height: 52px;
10     margin-top: 1px;position: relative;transition: background-position 1s;
11 }
12 .toolbar-item:hover .toolbar-layer{opacity: 1;filter: alpha(opacity=100);transform: scale(1)}
13 .toolbar-item-weixin{background-position: 0 -798px}
14 .toolbar-item-weixin:hover{background-position: 0 -860px}
15 .toolbar-item-weixin .toolbar-layer{height: 212px;background-position: 0 0}
16 .toolbar-item-feedback{background-position: 0 -426px}
17 .toolbar-item-feedback:hover{background-position: 0 -488px}
18 .toolbar-item-app{background-position: 0 -550px}
19 .toolbar-item-app:hover{background-position: 0 -612px}
20 .toolbar-item-app .toolbar-layer{height: 194px;background-position:0 -222px}
21 .toolbar-item-top{background-position: 0 -674px}
22 .toolbar-item-top:hover{background-position: 0 -736px}
23
24 .toolbar-layer{
25     position: absolute;
26     right: 52px;
27     bottom: -6px;
28     width: 172px;
29     background-image: url("images/toolbar.png");
30     background-repeat: no-repeat;
31     opacity: 0;
32     filter: alpha(opacity=0);
33     transform-origin: 95% 95%;
34     transform: scale(0.01);
35     transition: all 1s;
36 }

设置透明度：opacity: 0;兼容ie方式filter: alpha(opacity=0);

设置起始点：transform-origin: 95% 95%;缩放动画：transform: scale(0.01);