How to draw a layer on stage by json in kineticjs?

@jasen 

To draw a layer on stage by JSON in KineticJS, you can follow these steps:

1. Create a new Kinetic.Layer object.
2. Parse the JSON data containing the properties of the layer, such as its width, height, position, background color, and other attributes.
3. Use the parsed data to set the properties of the layer object.
4. Add the layer to the stage using the add() method.

Here is an example code snippet demonstrating how to draw a layer on stage by JSON in KineticJS:

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// Parse JSON data
var jsonData = {
  width: 500,
  height: 300,
  x: 0,
  y: 0,
  backgroundColor: 'lightblue'
};

// Create a new layer
var layer = new Kinetic.Layer();
layer.setWidth(jsonData.width);
layer.setHeight(jsonData.height);
layer.setPosition({x: jsonData.x, y: jsonData.y});
layer.setAttrs({
  backgroundColor: jsonData.backgroundColor
});

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

In this code snippet, we create a new layer object and set its properties based on the JSON data. We then add the layer to the stage to display it on the canvas.