title: display object properties using for/in loop javascript
body: <p>below is a simple samlple, i wanna display the object properties using for/in loop</p>
  
  <pre><code>var Object = { x:1, y:2, z:3 };
  for (property in Object) {
    console.log(Object.property);
  };
  </code></pre>
  
  <p>it shows undefined.</p>
  
  <p>but if using <code>console.log(Object[property]);</code> it works, and shows 1 2 3</p>
  
  <p>why i cannot use <code>Object.property</code> to display in for/in loop?</p>