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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"></script> </head> <body> <span></span> <script> $(function () { var keys =$.map( [0, 1, 52, 97], function (a) { return (a > 50 ? a - 45 : null); }); $("span").text(keys.join(", ")); }) </script> </body> </html>