let socketOpen = false
let socketMsgQueue = []
xhs.connectSocket({
  url: 'test.php'
})

xhs.onSocketOpen(function(res) {
  socketOpen = true
  for (let i = 0; i < socketMsgQueue.length; i++){
    sendSocketMessage(socketMsgQueue[i])
  }
  socketMsgQueue = []
})

function sendSocketMessage(msg) {
  if (socketOpen) {
    xhs.sendSocketMessage({
      data:msg
    })
  } else {
    socketMsgQueue.push(msg)
  }
}