SEEC-Playground-service-renderer/public/RenderDispatcher.js

const { draw, drawer } = window._PLAYGROUND

const host = '172.28.149.53'

const ws = new WebSocket(`ws://${host}:3001`)

ws.onopen = function () {
  console.log('open')
}

ws.onmessage = function (res) {
  console.log('message')
  const data = JSON.parse(res.data)
  console.log(data)
  const ast = data.result

  draw(ast)
}

window.addEventListener('unload', () => {
  console.log('window close')
  ws.close()
})