a标签尾类

.banner a:link {color: blue; text-decoration:none;} //未访问：蓝色、无下划线  .banner a:active:{color: red; } //激活：红色  .banner a:visited {color:purple;text-decoration:none;} //已访问：purple、无下划线  .banner a:hover {color: red; text-decoration:underline;} //鼠标移近：红色、下划线