span元素没有边框吗
<span style= "margin:0px;border:-1px;background:#ff0000;border-color:#00f ">

[解决办法]
;border:1px
[解决办法]
border:1px solid #00f;

[解决办法]
<span style= "padding:3px;border:1px solid #ddd; "> test </span>