在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
</head>
<body>

<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>
 
</body>
</html>
源代码

动行结果
