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HTML

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    <head>
        <link rel="stylesheet" href="http://code.jquery.com/qunit/git/qunit.css" type="text/css" media="screen" />
    </head>
    <body>
        <h1 id="qunit-header">Test cases for isNaN2 and isNumberic</h1>
        <h2 id="qunit-banner"></h2>
        <div id="qunit-testrunner-toolbar"></div>
        <h2 id="qunit-userAgent"></h2>
        <ol id="qunit-tests"></ol>
        <div id="qunit-fixture">test markup, will be hidden</div>
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JavaScript

/**
 * @author Larry Battle, http://bateru.com/news
 * @date May 12, 2012
 */
var isNaN2 = (function (global) {
  var _isNaN = global.isNaN;
  return function (val) {
    return _isNaN("" + val) || (
    typeof val === "object" && !(val || "").hasOwnProperty('push'));
  };
}(this));

var isNumberic = (function (global) {
  var _isNaN = global.isNaN;
  return function (val) {
    return !_isNaN("" + val) && (
    typeof val !== "object" || (val || "").hasOwnProperty('push'));
  };
}(this));

var type = function (val) {
    return Object.prototype.toString.call(val);
  };

var runAllTests = function () {
    test("test for non-numbers.", function () {
      var x = [
          undefined, null, [],
          {}, /regex/, true, false, 
          Math, this, NaN, "string", 0 / 0
      ];
      var i = x.length;
      while (i--) {
        equal(isNaN2(x[i]), true, "Type \'" + type(x[i]) + "\' with value, " + x[i] + ", should not be a number.");
      }
    });
    test("test for numbers.", function () {
      var x = ["-10", 16, 0xFF, "0xFF", 8e5, 3.1415, Math.PI, +10, 0144, 0, '0', 42, 1, 1 / 0, -1 / 0, Number(5)];
      var i = x.length;
      while (i--) {
        equal(isNumberic(x[i]), true, "Type \'" + type(x[i]) + "\' with value, " + x[i] + ", should not be a number.");
      }
    });
  };

runAllTests();