说明:本文档兼容性测试基础环境为:windows系统;IE6-10, Firefox4-17, Chrome16-23, Win Safari5.1.7, Opera11.5-12.5
background-repeat:<repeat-style> [ , <repeat-style> ]*
<repeat-style> = repeat-x | repeat-y | [repeat | no-repeat | space | round]{1,2}
默认值:repeat
适用于:所有元素
继承性:无