// See below for document.
const options = {
  container: document.getElementsByClassName('container')[0]
}
// canvas's width/height equals container's width/height
const draw = new EasyDrawingBoard(options); 

  // init
  import EasyDrawingBoard from 'easy-drawing-board'
  const container = document.getElementsByClassName('container')[0]
  const draw = new EasyDrawingBoard({container: container})

  // methods
  draw.conifg('lineColor', '#FF1493')                         // Change the color of the brush.
  draw.setMode('rect')                                        // Now you can draw the rectangle.

  draw.generateBase64().then(data => console.log(data))       // generateBase64 method default is to export the PNG base64 data.                              
  draw.generateBase64('jpeg').then(data => console.log(data)) // get smaller data.                          

  draw.saveImg()                                              // Save the canvas as an PNG images, and the file name is canvas_imgae.png.
  draw.saveImg({fileName: '233.png'})                         // Just Change of file name.
  draw.saveImg({tpye: 'jpeg', fileName: 'small.jpeg'})        // Sometimes we just need smaller pictures.