Question

我正在使用＆＃39; ws＆＃39; Node.js的库。

我可以编写代码，将数据从我的服务器发送到我的客户端，发布日期和时间更新，并在单击按钮时关闭套接字;

＆＃13;

var wss = new WebSocketServer({server: server});
console.log("WebSocket server created");

wss.on('connection', function(socket) {
        // SEND DATE AND TIME EVERY SECOND
	var interval = setInterval(function() {
		socket.send(JSON.stringify(new Date()), function() {});
	}, 1000);

	console.log("WebSocket connection opened");

	socket.on('close', function() {
		console.log("WebSocket connection closed");
		clearInterval(interval);
	});
});

＆＃13;

<html>
  <head>
    <script>
      var host = location.origin.replace(/^http/, 'ws')
      var ws = new WebSocket(host);
      ws.onmessage = function (event) {
        var li = document.createElement('li');
        li.innerHTML = JSON.parse(event.data);
        document.querySelector('#pings').appendChild(li);
      };

      function pressed() {
        // CLOSE STREAM
        ws.close();
      }
    </script>
  </head>

  <body>
    <h1>Pings</h1>
    <form name="form1" method="post" action="">
    <input type="button"  value="Call server" onClick="pressed()">
    <ul id='pings'></ul>
  </body>
</html>

＆＃13;

但由于某种原因，我无法找到一种方法将数据发送回服务器，然后调用控制台进行打印＆＃34;按下！＆＃34;管他呢。这是一种限制，因为它不是双向的，而是套接字似乎是单向流。

像这样;

＆＃13;

    var wss = new WebSocketServer({server: server});
    console.log("WebSocket server created");

    wss.on('connection', function(socket) {
            // SEND DATE AND TIME EVERY SECOND
    	var interval = setInterval(function() {
    		socket.send(JSON.stringify(new Date()), function() {});
    	}, 1000);

    	console.log("WebSocket connection opened");

        // LOOK FOR 'pressed' BEING SENT
      	socket.on('pressed', function() {
		    console.log("Pressed!");
		    socket.close();
	    });
      
    	socket.on('close', function() {
    		console.log("WebSocket connection closed");
    		clearInterval(interval);
    	});
    });

＆＃13;

<html>
  <head>
    <script>
      var host = location.origin.replace(/^http/, 'ws')
      var ws = new WebSocket(host);
      ws.onmessage = function (event) {
        var li = document.createElement('li');
        li.innerHTML = JSON.parse(event.data);
        document.querySelector('#pings').appendChild(li);
      };

      // SEND 'pressed' TO SERVER
      function pressed() {
        ws.send('pressed');
      }
    </script>
  </head>
  
  <body>
    <h1>Pings</h1>
    <form name="form1" method="post" action="">
    <input type="button"  value="Call server" onClick="pressed()">
    <ul id='pings'></ul>
  </body>
</html>

＆＃13;

我错过了什么，刚开始学习插座，感觉就像我试图用棉花勺在砖墙上挖洞。

Answer 1

客户端无法在套接字上触发任意事件。它始终是message事件。使用相同的客户端，在connection处理程序中尝试此服务器代码：

    socket.on('message', function(data) {
        // data === "pressed", since that's what the client sent
        console.log("Pressed!");
        socket.close();
    });

套接字毫无意义？

1 个答案: