[1.点击切换li，并隐藏多余的li](1.%E7%82%B9%E5%87%BB%E5%88%87%E6%8D%A2li%EF%BC%8C%E5%B9%B6%E9%9A%90%E8%97%8F%E5%A4%9A%E4%BD%99%E7%9A%84li.md)