setTimeout / setInterval mobile browser to calculate cpu efficiency
<p>The cpu efficiency of how to use setTimeout / setInterval to calculate mobile browser?</p>

<pre><code>function fn() {
    var start = new Date();
    setInterval(function () {
        var _s = new Date();
        console.info(_s - start);
        start = _s;
    }, 1000/60)
}
fn()
</code></pre>
