表格 tr 隔行换色
table tr:nth-child(odd){background:#FFF;}
table tr:nth-child(even){background:#F4F4F4;}
transition 渐隐和背景过度
.div {
transition: background-color 0.5s ease-out,opacity 0.5s;
-webkit-transition: background-color 0.5s ease-out,opacity 0.5s;
-moz-transition: background-color 0.5s ease-out,opacity 0.5s;
-o-transition: background-color 0.5s ease-out,opacity 0.5s;