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<html> <head> <title>单个边框属性 </title> <style type="text/css"> .d1 {border-top:5px solid #FF0000} .d2 {border-bottom:5px solid #FF0000} .d3 {border-left:5px solid #FF0000} .d4 {border-right:5px solid #FF0000} </style> </head> <body> <div>单个边框属性:</div> <div class = "d1">设置上边框用border-top</div> <div class = "d2">设置下边框用border-bottom</div> <div class = "d3">设置左边框用border-left</div> <div class = "d4">设置右边框用border-right</div> </body> </html>