How to track the animation frame count in kineticjs?

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// Create a new stage
var stage = new Kinetic.Stage({
    container: 'container',
    width: 500,
    height: 500
});

// Create a new layer
var layer = new Kinetic.Layer();

// Create a new shape
var circle = new Kinetic.Circle({
    x: stage.getWidth() / 2,
    y: stage.getHeight() / 2,
    radius: 50,
    fill: 'red',
    stroke: 'black',
    strokeWidth: 2
});

// Add the shape to the layer
layer.add(circle);

// Add the layer to the stage
stage.add(layer);

// Create a new animation
var anim = new Kinetic.Animation(function(frame) {
    // Log the frame count
    console.log(frame.frame);
}, layer);

// Start the animation
anim.start();