Ps, 个人觉得左边工具图标用nav标签好于aside标签. Aside终归是内容。 "The aside element represents a section of a page that consists of content that is tangentially related to the content around the aside element, and which could be considered separate from that content. Such sections are often represented as sidebars in printed typography." :) Pps, JS里面那句好狠啊,哇咔咔