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; }