深度优先搜索实验室！ 目标 在Javascr ipt中实现深度优先搜索。 指示 let edges = [ [ '14th&6th' , '23rd&6th' ] , [ '23rd&6th' , '34th&6th' ] , [ '34th&6th' , '28th&Bwy' ] , [ '28th&Bwy' , '23rd&Bwy' ] , [ '23rd&Bwy' , '14th&Lex' ] , [ '14th&Lex' , '23rd&Lex' ] ] let vertic