How to create a function in kineticjs?

@dana 

Creating a function in KineticJS involves defining the function and then attaching it to an event listener or calling it when needed. Here's a basic example of how to create a function in KineticJS:

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// Define the function
function exampleFunction() {
  console.log("This is an example function");
}

// Attach the function to a click event on a KineticJS shape
var stage = new Kinetic.Stage({
  container: 'container',
  width: 500,
  height: 500
});

var layer = new Kinetic.Layer();

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

circle.on('click', exampleFunction);

layer.add(circle);
stage.add(layer);

In this example, we first define the exampleFunction that logs a message to the console. Then, we create a KineticJS stage and layer, and a circle shape. We attach the exampleFunction to the click event of the circle shape using the on method. When the circle is clicked, the exampleFunction will be executed.

You can also call a function directly within your KineticJS code without attaching it to an event listener by simply invoking the function wherever needed in your code.