如何快速学习websocket?

时间：2019-12-15 19:11:07 阅读：90 评论：0 收藏：0 [点我收藏+]

html如下

<!DOCTYPE html>
<meta charset="utf-8" />
<title>WebSocket Test</title>
<script language="javascript" type="text/javascript">

var wsUri = "wss://echo.websocket.org/";
var output;

function init()
{
  output = document.getElementById("output");
  testWebSocket();
}

function testWebSocket()
{
  websocket = new WebSocket(wsUri);
  websocket.onopen = function(evt) { onOpen(evt) };
  websocket.onclose = function(evt) { onClose(evt) };
  websocket.onmessage = function(evt) { onMessage(evt) };
  websocket.onerror = function(evt) { onError(evt) };
}

function onOpen(evt)
{
  writeToScreen("CONNECTED");
  doSend("WebSocket rocks");
}

function onClose(evt)
{
  writeToScreen("DISCONNECTED");
}

function onMessage(evt)
{
  writeToScreen('<span style="color: blue;">RESPONSE: ' + evt.data+'</span>');
  websocket.close();
}

function onError(evt)
{
  writeToScreen('<span style="color: red;">ERROR:</span> ' + evt.data);
}

function doSend(message)
{
  writeToScreen("SENT: " + message);
  websocket.send(message);
}

function writeToScreen(message)
{
  var pre = document.createElement("p");
  pre.style.wordWrap = "break-word";
  pre.innerHTML = message;
  output.appendChild(pre);
}

window.addEventListener("load", init, false);

</script>

<h2>WebSocket Test</h2>

<div id="output"></div>

使用方法