How to send Binary Message via Websocket?

Question

JavaScript

Through which command can you send information so that the browser receives the following?

Answer 1

it turns out that we first convert String to Bin with this function:

function str2ab(str) {
  var buf = new ArrayBuffer(str.length*2); // 2 bytes for each char
  var bufView = new Uint16Array(buf);
  for (var i=0, strLen=str.length; i < strLen; i++) {
    bufView[i] = str.charCodeAt(i);
  }
  return buf;
}

and then send via WebSocket, but you need to set the binary message type in the connection on the client
ws.binaryType = 'arraybuffer';