css三角形
.up{ width: 0; height: 0; border-top: 15rpx solid transparent; border-right: 13rpx solid transparent; border-left: 13rpx solid transparent; border-bottom: 15rpx solid #000; } .down{ width: 0; height: 0; border-top: 15rpx solid transparent; border-right: 13rpx solid transparent; border-left: 13rpx solid transparent; border-top: 15rpx solid #000; }
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