相信很多人在处理li图形的时候，都会很纳闷，为什么list-style-type没有三角图案，难度要在网上下个三角图标作为list-style-image?怎么可能呢，所以我整理了网上一些css三角绘制的方法和代码。
Triangle-Up
Triangle-up
#triangle-up {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 100px solid red;
}
Triangle-Down
Triangle-Down
#triangle-down {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 100px solid red;
}
Triangle-Left
Triangle-Left
#triangle-left {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-right: 100px solid red;
border-bottom: 50px solid transparent;
}
Triangle-Right
Triangle-Right
#triangle-right {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-left: 100px solid red;
border-bottom: 50px solid transparent;
}
Triangle-Top-Left
Triangle-Top-Left
#triangle-topleft {
width: 0;
height: 0;
border-top: 100px solid red;
border-right: 100px solid transparent;
}
Triangle-Top-Right
Triangle-Top-Right
#triangle-topright {
width: 0;
height: 0;
border-top: 100px solid red;
border-left: 100px solid transparent;
}
Triangle-Bottom-left
Triangle-Bottom-left
#triangle-bottomleft {
width: 0;
height: 0;
border-bottom: 100px solid red;
border-right: 100px solid transparent;
}
Triangle-Bottom-Right
Triangle-Bottom-Right
#triangle-bottomright {
width: 0;
height: 0;
border-bottom: 100px solid red;
border-left: 100px solid transparent;
}
