隔行換色

<style>

 body{padding:0;margin:0;font:normal 12px/24px "\5FAE\8F6F\96C5\9ED1";color:#444;}
table{width:500px;border:0;margin:100px auto 0;text-align:center;border-collapse:collapse;border-spacing:0;}
table th{background:#0090D7;font-weight:normal;line-height:30px;font-size:14px;color:#FFF;}
table tr:nth-child(odd){background:#F4F4F4;}
table td:nth-child(even){color:#C00;}
table tr:nth-child(5){background:#73B1E0;color:#FFF;}
table tr:hover{background:#73B1E0;color:#FFF;}
table td,table th{border:1px solid #EEE;}</style>