css在 IE8下的兼容性

常用伪类选择器

	IE7	IE8	IE9
:hover	√	√	√
:focus	×	√	√
:first-child	√	√	√
:last-child	×	×	√
:first-of-type	×	×	√
:last-of-type	×	×	√
:nth-child(n)	×	×	√
:nth-last-child(n)	×	×	√
:nth-of-type(n)	×	×	√
:nth-last-of-type(n)	×	×	√
:enabled	×	×	√
:disabled	×	×	√
:checked	×	×	√

1. 超链接图片有蓝框

border:none;