<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>重写foreach</title> </head> <body> <script> Array.prototype.foreach=function(cb){ const _arr=this var _len=_arr.length var _arg2=arguments[1]||window for(var i=0;i<_len;i++){ cd.apply(_arg2,[_arr[i],i,_arr]) } } </script> </body> </html>
