css绘制 左右箭头，上下箭头，三角形

1. 左右箭头

.right-arrow {
    display :inline-block;
    position: relative;
    width: 36rpx;
    height: 36rpx;
    margin-right: 20rpx;
}

.right-arrow::after {
    display: inline-block;
    content: " ";
    height: 18rpx;
    width: 18rpx;
    border-width: 4rpx 4rpx 0 0;
    border-color: #c7c7cc;
    border-style: solid;
    transform: matrix(0.71, 0.71, -0.71, 0.71, 0, 0);
    position: absolute;
    top: 50%;
    right: 6rpx;
    margin-top: -9rpx;
}

// 加上active旋转成 左箭头
.right-arrow.active::after {
    transform-origin: center;
    transform: rotate(-135deg);
    transition: transform 0.3s;
}

右箭头效果：

左箭头效果：

2. 上下箭头

// 下箭头
.down-arrow {
    display :inline-block;
    position: relative;
    width: 40rpx;
    height: 30rpx;
    margin-right: 20rpx;
}

.down-arrow::after {
    display: inline-block;
    content: " ";
    height: 18rpx;
    width: 18rpx;
    border-width: 0 2rpx 2rpx 0;
    border-color: #999999;
    border-style: solid;
    transform: matrix(0.71, 0.71, -0.71, 0.71, 0, 0);
    transform-origin: center;
    transition: transform .3s;
    position: absolute;
    top: 50%;
    right: 10rpx;
    margin-top: -10rpx;
}
// 加上active旋转成 上箭头
.down-arrow.active::after {
    transform-origin: center;
    transform: rotate(-135deg);
    transition: transform 0.3s;
}

上下箭头效果：

3. 三角形

.triangle {
    display: inline-block;
    position: relative;
    top: 6rpx;
    margin-left: 10rpx;
    width: 0;
    height: 0;
    border: 10rpx solid transparent;
    border-top-color: @colorGray2;
}

三角形效果：

来源链接：blog.csdn.net/Che_rish/ar…