js 正整数 小数 正则表达式判断

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <title> New Document </title>
  <meta name="Generator" content="EditPlus">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
 </head>

 <body>
  <script type="text/javascript">
var a = 'abc';
var b = 123;
var c = 123.5;
var d = 123.45;
 
var r = /\.\d{0,}|\.$|[^0-9\.]/;
 
document.write(a+':'+!r.test(a)+'<br/>');
document.write(b+':'+!r.test(b)+'<br/>');
document.write(c+':'+!r.test(c)+'<br/>');
document.write(d+':'+!r.test(d)+'<br/>');
</script>
 </body>
</html>

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