css 三角形的制作

    <style>
        #sanjiao{
            width: 0px;
            height: 0px;
            border-top:10px solid black;
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
        }
   
    </style>
</head>
<body>
    <span id="sanjiao"></span>
原文地址:https://www.cnblogs.com/xiaowie/p/13782484.html