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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"> <link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script> <script> $(function () { function fun( html ){ document.body.innerHTML += "<br>" + html; } // true fun($.isNumeric( "-10" )); fun($.isNumeric( "0" )); fun($.isNumeric( 0xFF )); fun($.isNumeric( "0xFF" )); fun($.isNumeric( "8e5" )); fun($.isNumeric( "3.1415" )); fun($.isNumeric( +10 )); fun($.isNumeric( 0144 )); //false fun($.isNumeric( "-0x42" )); fun($.isNumeric( "7.2acdgs" )); fun($.isNumeric( "" )); fun($.isNumeric( {} )); fun($.isNumeric( NaN )); fun($.isNumeric( null )); fun($.isNumeric( true )); fun($.isNumeric( Infinity )); fun($.isNumeric( undefined )); }) </script> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：