a new problem

to be solved！font-awesome字体库在本地用不起来，即使用的cdn，同样的代码在runjs上可以加载出来，本地就不可以，引用的cdn，字体库下载下来也没有用

.triangle-up { width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-bottom: 100px solid #669; }
.triangle-down { width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-top: 100px solid #669; }
.triangle-left { width: 0; height: 0; border-top: 50px solid transparent; border-right: 100px solid #669; border-bottom: 50px solid transparent; }
.triangle-right { width: 0; height: 0; border-top: 50px solid transparent; border-left: 100px solid #669; border-bottom: 50px solid transparent; }
.triangle-updown { width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-bottom: 100px solid #669;position:relative;margin-bottom:50px}
.triangle-updown:after {content:" "; width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-top: 100px solid #669;position:absolute;top:50px;left:-50px;}

.triangle-topleft { width: 0; height: 0; border-top: 100px solid #669; border-right: 100px solid transparent; }
.triangle-topright { width: 0; height: 0; border-top: 100px solid #669; border-left: 100px solid transparent; }
.triangle-bottomleft { width: 0; height: 0; border-bottom: 100px solid #669; border-right: 100px solid transparent; }
.triangle-bottomright { width: 0; height: 0; border-bottom: 100px solid #669; border-left: 100px solid transparent; }