Finding the number of key's in an object
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/126100/how-to-efficiently-count-the-number-of-keys-properties-of-an-object-in-javascrip">How to efficiently count the number of keys/properties of an object in JavaScript?</a>  </p>
</blockquote>



<pre><code>var values = [{
    'SPO2': 222.00000,
    'VitalGroupID': 1152,
    'Temperature': 36.6666666666667,
    'DateTimeTaken': '/Date(1301494335000-0400)/',
    'UserID': 1,
    'Height': 182.88,
    'UserName': null,
    'BloodPressureDiastolic': 80,
    'Weight': 100909.090909091,
    'TemperatureMethod': 'Oral',
    'Resprate': null,
    'HeartRate': 111,
    'BloodPressurePosition': 'Standing',
    'VitalSite': 'Popliteal',
    'VitalID': 1135,
    'Laterality': 'Right',
    'HeartRateRegularity': 'Regular',
    'HeadCircumference': '',
    'BloodPressureSystolic': 120,
    'CuffSize': 'XL'
}];

for (i=0; i &lt; values.length; i++) {
        alert(values.length) // gives me 2. 
</code></pre>

<ul>
<li>How can find how how  many key's are there in my Object.</li>
</ul>
