{"html":"<!DOCTYPE html>\n<html lang=\"en\">\n <head>\n <meta charset=\"UTF-8\">\n </head>\n <body>\n \n <script>\n const _flatten = arr => {\n // 补全代码\n let result = []\n\t\t\tfunction _flatten2(arr) {\n\t\t\t\tfor (let i = 0; i < arr.length; i++) {\n\t\t\t\t\tif (Array.isArray(arr[i])) {\n\t\t\t\t\t\t_flatten2(arr[i])\n\t\t\t\t\t} else {\n\t\t\t\t\t\tresult.push(arr[i])\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\treturn result\n\t\t\t}\n return _flatten2(arr)\n }\n </script>\n </body>\n</html>","css":"","js":""}
