xxxxxxxxxx<html><meta charset="utf-8"><title>编程狮(w3cschool.cn)</title><style> .hackhome{ border:1px dashed #000; border-right:0; height:50px; width:350px }</style><body> <div> <p> <div class="hackhome">我的右边边框无边线而其它三边为黑色虚线边框实例</div> </p> </div></body></html>