websocket javascript规范

来源：互联网发布：纬创软件编辑：程序博客网时间：2024/05/23 19:57

清单 2. WebSocket JavaScript 定义

 [Constructor(in DOMString url, in optional DOMString protocol)]  interface WebSocket {    readonly attribute DOMString URL;         // ready state    const unsigned short CONNECTING = 0;    const unsigned short OPEN = 1;    const unsigned short CLOSED = 2;    readonly attribute unsigned short readyState;    readonly attribute unsigned long bufferedAmount;    //networking    attribute Function onopen;    attribute Function onmessage;    attribute Function onclose;    boolean send(in DOMString data);    void close();  };  WebSocket implements EventTarget;

其中 URL 属性代表 WebSocket 服务器的网络地址，协议通常是”ws”,send 方法就是发送数据到服务器端，close 方法就是关闭连接。除了这些方法，还有一些很重要的事件：onopen，onmessage，onerror 以及 onclose。

javascript demo:

var socket = global.webSocket(socketUrl);        if( socket )        {            socket.onopen = function(){                log('socket opened');            };            socket.onmessage = function(data){                log('message' , data);            };            socket.onerror = function(data){                log('error' , data);            };            socket.onclose = function(data)            {                log('close' , data);            }        }var global = {};global.webSocket = function(wsUrl){    var obj = null;    var agent = window.navigator.userAgent;    if( /(firefox)/i.test(agent) )    {        obj = new window.MozWebSocket(wsUrl);    }    else    {        if( window.WebSocket )        {            obj = new window.WebSocket(wsUrl);        }    }    return obj;};