javascript - 如何在CSS中创建向下/向上箭头

Question

如何在 css 中创建向下/向上的箭头？

我尝试从 div 构建它:

.triangle_down {
    width: 0;
    height: 0;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    border-top: 15px solid #2f2f2f;
    font-size: 0;
    line-height: 0;
    float: left;
}

这是结果: .

但我试图构建这样的东西:

有什么建议吗？

Answer 1

我的建议是:

.triangle_down {
  width: 0;
  height: 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-top: 15px solid #2f2f2f;
  font-size: 0;
  line-height: 0;
  float: left;
}
.triangle_down1 {
  position: relative;
  top: -5px;
  content: "";
  display: inline-block;
  width: 15px;
  height: 15px;
  border-right: 0.2em solid black;
  border-top: 0.2em solid black;
  transform: rotate(135deg);
  margin-right: 0.5em;
  margin-left: 1.0em;
}
 .triangle_up1 {
   position: relative;
   top: -5px;
   content: "";
   display: inline-block;
   width: 15px;
   height: 15px;
   border-right: 0.2em solid black;
   border-top: 0.2em solid black;
   transform: rotate(-45deg);
   margin-right: 0.5em;
   margin-left: 1.0em;
 }

<div id="dialog1" class="triangle_down"></div>
<div id="dialog2" class="triangle_down1"></div>
<div id="dialog3" class="triangle_up1"></div>