下拉框等需要顯示上下箭頭切換的CSS樣式

 1 .icon-right, .icon-down, .icon-up {
 2 display: inline-block;
 3 padding-right: 13rpx;
 4 position: absolute;
 5 /*組件內調整箭頭的位置*/
 6 right: 20rpx;
 7 top: 10rpx;
 8 }
 9 
10 .icon-right::after, .icon-down::after, .icon-up::after {
11 content: "";
12 display: inline-block;
13 position: relative;
14 bottom: 2rpx;
15 margin-left: 10rpx;
16 height: 10px;
17 width: 10px;
18 border: solid #bbb;/*上下箭頭的顏色*/
19 border-width: 2px 2px 0 0;/*上下箭頭的粗細*/
20 }
21 
22 .icon-right::after {
23 -webkit-transform: rotate(45deg);
24 transform: rotate(45deg);
25 }
26 
27 .icon-down::after {
28 bottom: 14rpx;/*旋轉後需要上移*/
29 -webkit-transform: rotate(135deg);
30 transform: rotate(135deg);
31 }
32 
33 .icon-up::after {
34 bottom: 0rpx;
35 -webkit-transform: rotate(-45deg);
36 transform: rotate(-45deg);
37 }

 效果：