简述
在前面，我们分享过关于三角的实现方式，主要根据border属性来设置，下面我们来实现上、下、左、右各种不同颜色的三角。
<!DOCTYPE html><html><head><style type='text/css'>/* 上三角 */.arrow-up { width: 0; height: 0; border-left: 20px solid transparent; border-right: 20px solid transparent; border-bottom: 20px solid green;}/* 下三角 */.arrow-down { width: 0; height: 0; border-left: 20px solid transparent; border-right: 20px solid transparent; border-top: 20px solid orange;}/* 右三角 */.arrow-right { width: 0; height: 0; border-top: 60px solid transparent; border-bottom: 60px solid transparent; border-left: 60px solid blue;}/* 左三角 */.arrow-left { width: 0; height: 0; border-top: 10px solid transparent; border-bottom: 10px solid transparent; border-right: 10px solid silver;}</style></head><body> <div class="arrow-up"></div> <div class="arrow-down"></div> <div class="arrow-left"></div> <div class="arrow-right"></div></body></html>代码比较简单，我就不过多阐述了！
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