Check if key / value pair exist within another object
<p>If I have the following two objects (Object A and Object B), how can I check if Object B's key/value exists with Object A? In the below example it should return True because both 'make: "Apple"' and 'Model: "iPad"' exists in Object A.</p>

<p><strong>Edit:</strong> Object B will be dynamic and may contain only Make or only Model. More keys are added dynamically via checkbox filters.</p>

<p>Is it easier to use a library such as Underscore? If so what functions would be applicable?</p>

<p>I hope this makes sense?</p>

<pre><code>        var a = {
            Make: "Apple",
            Model: "iPad",
            hasScreen: "yes",
            Review: "Great product!",
        }

        var b = {
            Make: "Apple",
            Model: "iPad"
        }
</code></pre>