Websocket发送blob对象而不是字符串

我能跑起来 Websocket on message 事件,而我要发送文本。

const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 })

var sockets = [];

wss.on('connection', ws => {
    //var id = ws.upgradeReq.headers['sec-websocket-key'];
    //console.log("New connection id ::", id);
    //w.send(id);
    sockets.push(ws);
    console.log("New client connected"+ ws);

  ws.on('message', message => {

    console.log(`Received message => ${message}`)

    //var id = ws.upgradeReq.headers['sec-websocket-key'];
    //var mes = JSON.parse(message);

    //sockets[message.to].send(mes.message);
     // console.log('Message on :: ', id);
    //console.log('On message :: ', message);
    sockets.forEach(w=> {
        w.send(message);
    });
  })

  ws.send('Welcome by server!')
})

客户端代码摘录

connection.onmessage = (e) => {
  document.getElementById("ReceviedText").innerHTML += ("<li>" + e.data + "</li>");

   // ReceviedText
  console.log(e.data);
  console.log(e);

  var reader = new FileReader(e.data);
  console.log(reader.result);

  //console.log(reader.readAsText());
  console.log(reader.readAsText(e.data));

}