伪类中使用element图标
/deep/.el-step.is-horizontal .el-step__line::after {
content: "\e6e0";
font-family: element-icons;
position: absolute;
right: -8px;
font-weight: 500;
top: -11px;
font-size: 22px;
}
这一行是必须加的：
font-family: element-icons;
