websocket 重连解决方案

1、websocket 重连的脚本：https://github.com/joewalnes/reconnecting-websocket                 reconnecting-websocket.js

// MIT License:
//
// Copyright (c) 2010-2012, Joe Walnes
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

/**
 * This behaves like a WebSocket in every way, except if it fails to connect,
 * or it gets disconnected, it will repeatedly poll until it successfully connects
 * again.
 *
 * It is API compatible, so when you have:
 *   ws = new WebSocket('ws://....');
 * you can replace with:
 *   ws = new ReconnectingWebSocket('ws://....');
 *
 * The event stream will typically look like:
 *  onconnecting
 *  onopen
 *  onmessage
 *  onmessage
 *  onclose // lost connection
 *  onconnecting
 *  onopen  // sometime later...
 *  onmessage
 *  onmessage
 *  etc...
 *
 * It is API compatible with the standard WebSocket API, apart from the following members:
 *
 * - `bufferedAmount`
 * - `extensions`
 * - `binaryType`
 *
 * Latest version: https://github.com/joewalnes/reconnecting-websocket/
 * - Joe Walnes
 *
 * Syntax
 * ======
 * var socket = new ReconnectingWebSocket(url, protocols, options);
 *
 * Parameters
 * ==========
 * url - The url you are connecting to.
 * protocols - Optional string or array of protocols.
 * options - See below
 *
 * Options
 * =======
 * Options can either be passed upon instantiation or set after instantiation:
 *
 * var socket = new ReconnectingWebSocket(url, null, { debug: true, reconnectInterval: 4000 });
 *
 * or
 *
 * var socket = new ReconnectingWebSocket(url);
 * socket.debug = true;
 * socket.reconnectInterval = 4000;
 *
 * debug
 * - Whether this instance should log debug messages. Accepts true or false. Default: false.
 *
 * automaticOpen
 * - Whether or not the websocket should attempt to connect immediately upon instantiation. The socket can be manually opened or closed at any time using ws.open() and ws.close().
 *
 * reconnectInterval
 * - The number of milliseconds to delay before attempting to reconnect. Accepts integer. Default: 1000.
 *
 * maxReconnectInterval
 * - The maximum number of milliseconds to delay a reconnection attempt. Accepts integer. Default: 30000.
 *
 * reconnectDecay
 * - The rate of increase of the reconnect delay. Allows reconnect attempts to back off when problems persist. Accepts integer or float. Default: 1.5.
 *
 * timeoutInterval
 * - The maximum time in milliseconds to wait for a connection to succeed before closing and retrying. Accepts integer. Default: 2000.
 *
 */
(function (global, factory) {
    if (typeof define === 'function' && define.amd) {
        define([], factory);
    } else if (typeof module !== 'undefined' && module.exports){
        module.exports = factory();
    } else {
        global.ReconnectingWebSocket = factory();
    }
})(this, function () {

    if (!('WebSocket' in window)) {
        return;
    }

    function ReconnectingWebSocket(url, protocols, options) {

        // Default settings
        var settings = {

            /** Whether this instance should log debug messages. */
            debug: false,

            /** Whether or not the websocket should attempt to connect immediately upon instantiation. */
            automaticOpen: true,

            /** The number of milliseconds to delay before attempting to reconnect. */
            reconnectInterval: 1000,
            /** The maximum number of milliseconds to delay a reconnection attempt. */
            maxReconnectInterval: 30000,
            /** The rate of increase of the reconnect delay. Allows reconnect attempts to back off when problems persist. */
            reconnectDecay: 1.5,

            /** The maximum time in milliseconds to wait for a connection to succeed before closing and retrying. */
            timeoutInterval: 2000,

            /** The maximum number of reconnection attempts to make. Unlimited if null. */
            maxReconnectAttempts: null,

            /** The binary type, possible values 'blob' or 'arraybuffer', default 'blob'. */
            binaryType: 'blob'
        }
        if (!options) { options = {}; }

        // Overwrite and define settings with options if they exist.
        for (var key in settings) {
            if (typeof options[key] !== 'undefined') {
                this[key] = options[key];
            } else {
                this[key] = settings[key];
            }
        }

        // These should be treated as read-only properties

        /** The URL as resolved by the constructor. This is always an absolute URL. Read only. */
        this.url = url;

        /** The number of attempted reconnects since starting, or the last successful connection. Read only. */
        this.reconnectAttempts = 0;

        /**
         * The current state of the connection.
         * Can be one of: WebSocket.CONNECTING, WebSocket.OPEN, WebSocket.CLOSING, WebSocket.CLOSED
         * Read only.
         */
        this.readyState = WebSocket.CONNECTING;

        /**
         * A string indicating the name of the sub-protocol the server selected; this will be one of
         * the strings specified in the protocols parameter when creating the WebSocket object.
         * Read only.
         */
        this.protocol = null;

        // Private state variables

        var self = this;
        var ws;
        var forcedClose = false;
        var timedOut = false;
        var eventTarget = document.createElement('div');

        // Wire up "on*" properties as event handlers

        eventTarget.addEventListener('open',       function(event) { self.onopen(event); });
        eventTarget.addEventListener('close',      function(event) { self.onclose(event); });
        eventTarget.addEventListener('connecting', function(event) { self.onconnecting(event); });
        eventTarget.addEventListener('message',    function(event) { self.onmessage(event); });
        eventTarget.addEventListener('error',      function(event) { self.onerror(event); });

        // Expose the API required by EventTarget

        this.addEventListener = eventTarget.addEventListener.bind(eventTarget);
        this.removeEventListener = eventTarget.removeEventListener.bind(eventTarget);
        this.dispatchEvent = eventTarget.dispatchEvent.bind(eventTarget);

        /**
         * This function generates an event that is compatible with standard
         * compliant browsers and IE9 - IE11
         *
         * This will prevent the error:
         * Object doesn't support this action
         *
         * http://stackoverflow.com/questions/19345392/why-arent-my-parameters-getting-passed-through-to-a-dispatched-event/19345563#19345563
         * @param s String The name that the event should use
         * @param args Object an optional object that the event will use
         */
        function generateEvent(s, args) {
            var evt = document.createEvent("CustomEvent");
            evt.initCustomEvent(s, false, false, args);
            return evt;
        };

        this.open = function (reconnectAttempt) {
            ws = new WebSocket(self.url, protocols || []);
            ws.binaryType = this.binaryType;

            if (reconnectAttempt) {
                if (this.maxReconnectAttempts && this.reconnectAttempts > this.maxReconnectAttempts) {
                    return;
                }
            } else {
                eventTarget.dispatchEvent(generateEvent('connecting'));
                this.reconnectAttempts = 0;
            }

            if (self.debug || ReconnectingWebSocket.debugAll) {
                console.debug('ReconnectingWebSocket', 'attempt-connect', self.url);
            }

            var localWs = ws;
            var timeout = setTimeout(function() {
                if (self.debug || ReconnectingWebSocket.debugAll) {
                    console.debug('ReconnectingWebSocket', 'connection-timeout', self.url);
                }
                timedOut = true;
                localWs.close();
                timedOut = false;
            }, self.timeoutInterval);

            ws.onopen = function(event) {
                clearTimeout(timeout);
                if (self.debug || ReconnectingWebSocket.debugAll) {
                    console.debug('ReconnectingWebSocket', 'onopen', self.url);
                }
                self.protocol = ws.protocol;
                self.readyState = WebSocket.OPEN;
                self.reconnectAttempts = 0;
                var e = generateEvent('open');
                e.isReconnect = reconnectAttempt;
                reconnectAttempt = false;
                eventTarget.dispatchEvent(e);
            };

            ws.onclose = function(event) {
                clearTimeout(timeout);
                ws = null;
                if (forcedClose) {
                    self.readyState = WebSocket.CLOSED;
                    eventTarget.dispatchEvent(generateEvent('close'));
                } else {
                    self.readyState = WebSocket.CONNECTING;
                    var e = generateEvent('connecting');
                    e.code = event.code;
                    e.reason = event.reason;
                    e.wasClean = event.wasClean;
                    eventTarget.dispatchEvent(e);
                    if (!reconnectAttempt && !timedOut) {
                        if (self.debug || ReconnectingWebSocket.debugAll) {
                            console.debug('ReconnectingWebSocket', 'onclose', self.url);
                        }
                        eventTarget.dispatchEvent(generateEvent('close'));
                    }

                    var timeout = self.reconnectInterval * Math.pow(self.reconnectDecay, self.reconnectAttempts);
                    setTimeout(function() {
                        self.reconnectAttempts++;
                        self.open(true);
                    }, timeout > self.maxReconnectInterval ? self.maxReconnectInterval : timeout);
                }
            };
            ws.onmessage = function(event) {
                if (self.debug || ReconnectingWebSocket.debugAll) {
                    console.debug('ReconnectingWebSocket', 'onmessage', self.url, event.data);
                }
                var e = generateEvent('message');
                e.data = event.data;
                eventTarget.dispatchEvent(e);
            };
            ws.onerror = function(event) {
                if (self.debug || ReconnectingWebSocket.debugAll) {
                    console.debug('ReconnectingWebSocket', 'onerror', self.url, event);
                }
                eventTarget.dispatchEvent(generateEvent('error'));
            };
        }

        // Whether or not to create a websocket upon instantiation
        if (this.automaticOpen == true) {
            this.open(false);
        }

        /**
         * Transmits data to the server over the WebSocket connection.
         *
         * @param data a text string, ArrayBuffer or Blob to send to the server.
         */
        this.send = function(data) {
            if (ws) {
                if (self.debug || ReconnectingWebSocket.debugAll) {
                    console.debug('ReconnectingWebSocket', 'send', self.url, data);
                }
                return ws.send(data);
            } else {
                throw 'INVALID_STATE_ERR : Pausing to reconnect websocket';
            }
        };

        /**
         * Closes the WebSocket connection or connection attempt, if any.
         * If the connection is already CLOSED, this method does nothing.
         */
        this.close = function(code, reason) {
            // Default CLOSE_NORMAL code
            if (typeof code == 'undefined') {
                code = 1000;
            }
            forcedClose = true;
            if (ws) {
                ws.close(code, reason);
            }
        };

        /**
         * Additional public API method to refresh the connection if still open (close, re-open).
         * For example, if the app suspects bad data / missed heart beats, it can try to refresh.
         */
        this.refresh = function() {
            if (ws) {
                ws.close();
            }
        };
    }

    /**
     * An event listener to be called when the WebSocket connection's readyState changes to OPEN;
     * this indicates that the connection is ready to send and receive data.
     */
    ReconnectingWebSocket.prototype.onopen = function(event) {};
    /** An event listener to be called when the WebSocket connection's readyState changes to CLOSED. */
    ReconnectingWebSocket.prototype.onclose = function(event) {};
    /** An event listener to be called when a connection begins being attempted. */
    ReconnectingWebSocket.prototype.onconnecting = function(event) {};
    /** An event listener to be called when a message is received from the server. */
    ReconnectingWebSocket.prototype.onmessage = function(event) {};
    /** An event listener to be called when an error occurs. */
    ReconnectingWebSocket.prototype.onerror = function(event) {};

    /**
     * Whether all instances of ReconnectingWebSocket should log debug messages.
     * Setting this to true is the equivalent of setting all instances of ReconnectingWebSocket.debug to true.
     */
    ReconnectingWebSocket.debugAll = false;

    ReconnectingWebSocket.CONNECTING = WebSocket.CONNECTING;
    ReconnectingWebSocket.OPEN = WebSocket.OPEN;
    ReconnectingWebSocket.CLOSING = WebSocket.CLOSING;
    ReconnectingWebSocket.CLOSED = WebSocket.CLOSED;

    return ReconnectingWebSocket;
});

2、监听网络状态的脚本：https://github.com/hubspot/offline                        offline.js

/*! offline-js 0.7.18 */
(function() {
  var Offline, checkXHR, defaultOptions, extendNative, grab, handlers, init;
  extendNative = function(to, from) {
    var e, key, results, val;
    results = [];
    for (key in from.prototype) try {
      val = from.prototype[key], null == to[key] && "function" != typeof val ? results.push(to[key] = val) :results.push(void 0);
    } catch (_error) {
      e = _error;
    }
    return results;
  }, Offline = {}, Offline.options = window.Offline ? window.Offline.options || {} :{},
  defaultOptions = {
    checks:{
      xhr:{
        url:function() {
          return "/favicon.ico?_=" + new Date().getTime();
        },
        timeout:5e3,
        type:"HEAD"
      },
      image:{
        url:function() {
          return "/favicon.ico?_=" + new Date().getTime();
        }
      },
      active:"xhr"
    },
    checkOnLoad:!1,
    interceptRequests:!0,
    reconnect:!0,
    deDupBody:!1
  }, grab = function(obj, key) {
    var cur, i, j, len, part, parts;
    for (cur = obj, parts = key.split("."), i = j = 0, len = parts.length; len > j && (part = parts[i],
    cur = cur[part], "object" == typeof cur); i = ++j) ;
    return i === parts.length - 1 ? cur :void 0;
  }, Offline.getOption = function(key) {
    var ref, val;
    return val = null != (ref = grab(Offline.options, key)) ? ref :grab(defaultOptions, key),
    "function" == typeof val ? val() :val;
  }, "function" == typeof window.addEventListener && window.addEventListener("online", function() {
    return setTimeout(Offline.confirmUp, 100);
  }, !1), "function" == typeof window.addEventListener && window.addEventListener("offline", function() {
    return Offline.confirmDown();
  }, !1), Offline.state = "up", Offline.markUp = function() {
    return Offline.trigger("confirmed-up"), "up" !== Offline.state ? (Offline.state = "up",
    Offline.trigger("up")) :void 0;
  }, Offline.markDown = function() {
    return Offline.trigger("confirmed-down"), "down" !== Offline.state ? (Offline.state = "down",
    Offline.trigger("down")) :void 0;
  }, handlers = {}, Offline.on = function(event, handler, ctx) {
    var e, events, j, len, results;
    if (events = event.split(" "), events.length > 1) {
      for (results = [], j = 0, len = events.length; len > j; j++) e = events[j], results.push(Offline.on(e, handler, ctx));
      return results;
    }
    return null == handlers[event] && (handlers[event] = []), handlers[event].push([ ctx, handler ]);
  }, Offline.off = function(event, handler) {
    var _handler, ctx, i, ref, results;
    if (null != handlers[event]) {
      if (handler) {
        for (i = 0, results = []; i < handlers[event].length; ) ref = handlers[event][i],
        ctx = ref[0], _handler = ref[1], _handler === handler ? results.push(handlers[event].splice(i, 1)) :results.push(i++);
        return results;
      }
      return handlers[event] = [];
    }
  }, Offline.trigger = function(event) {
    var ctx, handler, j, len, ref, ref1, results;
    if (null != handlers[event]) {
      for (ref = handlers[event].slice(0), results = [], j = 0, len = ref.length; len > j; j++) ref1 = ref[j],
      ctx = ref1[0], handler = ref1[1], results.push(handler.call(ctx));
      return results;
    }
  }, checkXHR = function(xhr, onUp, onDown) {
    var _onerror, _onload, _onreadystatechange, _ontimeout, checkStatus;
    return checkStatus = function() {
      return xhr.status && xhr.status < 12e3 ? onUp() :onDown();
    }, null === xhr.onprogress ? (_onerror = xhr.onerror, xhr.onerror = function() {
      return onDown(), "function" == typeof _onerror ? _onerror.apply(null, arguments) :void 0;
    }, _ontimeout = xhr.ontimeout, xhr.ontimeout = function() {
      return onDown(), "function" == typeof _ontimeout ? _ontimeout.apply(null, arguments) :void 0;
    }, _onload = xhr.onload, xhr.onload = function() {
      return checkStatus(), "function" == typeof _onload ? _onload.apply(null, arguments) :void 0;
    }) :(_onreadystatechange = xhr.onreadystatechange, xhr.onreadystatechange = function() {
      return 4 === xhr.readyState ? checkStatus() :0 === xhr.readyState && onDown(), "function" == typeof _onreadystatechange ? _onreadystatechange.apply(null, arguments) :void 0;
    });
  }, Offline.checks = {}, Offline.checks.xhr = function() {
    var e, xhr;
    xhr = new XMLHttpRequest(), xhr.offline = !1, xhr.open(Offline.getOption("checks.xhr.type"), Offline.getOption("checks.xhr.url"), !0),
    null != xhr.timeout && (xhr.timeout = Offline.getOption("checks.xhr.timeout")),
    checkXHR(xhr, Offline.markUp, Offline.markDown);
    try {
      xhr.send();
    } catch (_error) {
      e = _error, Offline.markDown();
    }
    return xhr;
  }, Offline.checks.image = function() {
    var img;
    img = document.createElement("img"), img.onerror = Offline.markDown, img.onload = Offline.markUp,
    img.src = Offline.getOption("checks.image.url");
  }, Offline.checks.down = Offline.markDown, Offline.checks.up = Offline.markUp, Offline.check = function() {
    return Offline.trigger("checking"), Offline.checks[Offline.getOption("checks.active")]();
  }, Offline.confirmUp = Offline.confirmDown = Offline.check, Offline.onXHR = function(cb) {
    var _XDomainRequest, _XMLHttpRequest, monitorXHR;
    return monitorXHR = function(req, flags) {
      var _open;
      return _open = req.open, req.open = function(type, url, async, user, password) {
        return cb({
          type:type,
          url:url,
          async:async,
          flags:flags,
          user:user,
          password:password,
          xhr:req
        }), _open.apply(req, arguments);
      };
    }, _XMLHttpRequest = window.XMLHttpRequest, window.XMLHttpRequest = function(flags) {
      var _overrideMimeType, _setRequestHeader, req;
      return req = new _XMLHttpRequest(flags), monitorXHR(req, flags), _setRequestHeader = req.setRequestHeader,
      req.headers = {}, req.setRequestHeader = function(name, value) {
        return req.headers[name] = value, _setRequestHeader.call(req, name, value);
      }, _overrideMimeType = req.overrideMimeType, req.overrideMimeType = function(type) {
        return req.mimeType = type, _overrideMimeType.call(req, type);
      }, req;
    }, extendNative(window.XMLHttpRequest, _XMLHttpRequest), null != window.XDomainRequest ? (_XDomainRequest = window.XDomainRequest,
    window.XDomainRequest = function() {
      var req;
      return req = new _XDomainRequest(), monitorXHR(req), req;
    }, extendNative(window.XDomainRequest, _XDomainRequest)) :void 0;
  }, init = function() {
    return Offline.getOption("interceptRequests") && Offline.onXHR(function(arg) {
      var xhr;
      return xhr = arg.xhr, xhr.offline !== !1 ? checkXHR(xhr, Offline.markUp, Offline.confirmDown) :void 0;
    }), Offline.getOption("checkOnLoad") ? Offline.check() :void 0;
  }, setTimeout(init, 0), window.Offline = Offline;
}).call(this), function() {
  var down, next, nope, rc, reset, retryIntv, tick, tryNow, up;
  if (!window.Offline) throw new Error("Offline Reconnect brought in without offline.js");
  rc = Offline.reconnect = {}, retryIntv = null, reset = function() {
    var ref;
    return null != rc.state && "inactive" !== rc.state && Offline.trigger("reconnect:stopped"),
    rc.state = "inactive", rc.remaining = rc.delay = null != (ref = Offline.getOption("reconnect.initialDelay")) ? ref :3;
  }, next = function() {
    var delay, ref;
    return delay = null != (ref = Offline.getOption("reconnect.delay")) ? ref :Math.min(Math.ceil(1.5 * rc.delay), 3600),
    rc.remaining = rc.delay = delay;
  }, tick = function() {
    return "connecting" !== rc.state ? (rc.remaining -= 1, Offline.trigger("reconnect:tick"),
    0 === rc.remaining ? tryNow() :void 0) :void 0;
  }, tryNow = function() {
    return "waiting" === rc.state ? (Offline.trigger("reconnect:connecting"), rc.state = "connecting",
    Offline.check()) :void 0;
  }, down = function() {
    return Offline.getOption("reconnect") ? (reset(), rc.state = "waiting", Offline.trigger("reconnect:started"),
    retryIntv = setInterval(tick, 1e3)) :void 0;
  }, up = function() {
    return null != retryIntv && clearInterval(retryIntv), reset();
  }, nope = function() {
    return Offline.getOption("reconnect") && "connecting" === rc.state ? (Offline.trigger("reconnect:failure"),
    rc.state = "waiting", next()) :void 0;
  }, rc.tryNow = tryNow, reset(), Offline.on("down", down), Offline.on("confirmed-down", nope),
  Offline.on("up", up);
}.call(this), function() {
  var clear, flush, held, holdRequest, makeRequest, waitingOnConfirm;
  if (!window.Offline) throw new Error("Requests module brought in without offline.js");
  held = [], waitingOnConfirm = !1, holdRequest = function(req) {
    return Offline.getOption("requests") !== !1 ? (Offline.trigger("requests:capture"),
    "down" !== Offline.state && (waitingOnConfirm = !0), held.push(req)) :void 0;
  }, makeRequest = function(arg) {
    var body, name, password, ref, type, url, user, val, xhr;
    if (xhr = arg.xhr, url = arg.url, type = arg.type, user = arg.user, password = arg.password,
    body = arg.body, Offline.getOption("requests") !== !1) {
      xhr.abort(), xhr.open(type, url, !0, user, password), ref = xhr.headers;
      for (name in ref) val = ref[name], xhr.setRequestHeader(name, val);
      return xhr.mimeType && xhr.overrideMimeType(xhr.mimeType), xhr.send(body);
    }
  }, clear = function() {
    return held = [];
  }, flush = function() {
    var body, i, key, len, request, requests, url;
    if (Offline.getOption("requests") !== !1) {
      for (Offline.trigger("requests:flush"), requests = {}, i = 0, len = held.length; len > i; i++) request = held[i],
      url = request.url.replace(/(\?|&)_=[0-9]+/, function(match, chr) {
        return "?" === chr ? chr :"";
      }), Offline.getOption("deDupBody") ? (body = request.body, body = "[object Object]" === body.toString() ? JSON.stringify(body) :body.toString(),
      requests[request.type.toUpperCase() + " - " + url + " - " + body] = request) :requests[request.type.toUpperCase() + " - " + url] = request;
      for (key in requests) request = requests[key], makeRequest(request);
      return clear();
    }
  }, setTimeout(function() {
    return Offline.getOption("requests") !== !1 ? (Offline.on("confirmed-up", function() {
      return waitingOnConfirm ? (waitingOnConfirm = !1, clear()) :void 0;
    }), Offline.on("up", flush), Offline.on("down", function() {
      return waitingOnConfirm = !1;
    }), Offline.onXHR(function(request) {
      var _onreadystatechange, _send, async, hold, xhr;
      return xhr = request.xhr, async = request.async, xhr.offline !== !1 && (hold = function() {
        return holdRequest(request);
      }, _send = xhr.send, xhr.send = function(body) {
        return request.body = body, _send.apply(xhr, arguments);
      }, async) ? null === xhr.onprogress ? (xhr.addEventListener("error", hold, !1),
      xhr.addEventListener("timeout", hold, !1)) :(_onreadystatechange = xhr.onreadystatechange,
      xhr.onreadystatechange = function() {
        return 0 === xhr.readyState ? hold() :4 === xhr.readyState && (0 === xhr.status || xhr.status >= 12e3) && hold(),
        "function" == typeof _onreadystatechange ? _onreadystatechange.apply(null, arguments) :void 0;
      }) :void 0;
    }), Offline.requests = {
      flush:flush,
      clear:clear
    }) :void 0;
  }, 0);
}.call(this), function() {
  var base, e, i, len, ref, simulate, state;
  if (!Offline) throw new Error("Offline simulate brought in without offline.js");
  for (ref = [ "up", "down" ], i = 0, len = ref.length; len > i; i++) {
    state = ref[i];
    try {
      simulate = document.querySelector("script[data-simulate='" + state + "']") || ("undefined" != typeof localStorage && null !== localStorage ? localStorage.OFFLINE_SIMULATE :void 0) === state;
    } catch (_error) {
      e = _error, simulate = !1;
    }
  }
  simulate && (null == Offline.options && (Offline.options = {}), null == (base = Offline.options).checks && (base.checks = {}),
  Offline.options.checks.active = state);
}.call(this), function() {
  var RETRY_TEMPLATE, TEMPLATE, _onreadystatechange, addClass, content, createFromHTML, el, flashClass, flashTimeouts, init, removeClass, render, roundTime;
  if (!window.Offline) throw new Error("Offline UI brought in without offline.js");
  TEMPLATE = '<div class="offline-ui"><div class="offline-ui-content"></div></div>',
  RETRY_TEMPLATE = '<a href class="offline-ui-retry"></a>', createFromHTML = function(html) {
    var el;
    return el = document.createElement("div"), el.innerHTML = html, el.children[0];
  }, el = content = null, addClass = function(name) {
    return removeClass(name), el.className += " " + name;
  }, removeClass = function(name) {
    return el.className = el.className.replace(new RegExp("(^| )" + name.split(" ").join("|") + "( |$)", "gi"), " ");
  }, flashTimeouts = {}, flashClass = function(name, time) {
    return addClass(name), null != flashTimeouts[name] && clearTimeout(flashTimeouts[name]),
    flashTimeouts[name] = setTimeout(function() {
      return removeClass(name), delete flashTimeouts[name];
    }, 1e3 * time);
  }, roundTime = function(sec) {
    var mult, unit, units, val;
    units = {
      day:86400,
      hour:3600,
      minute:60,
      second:1
    };
    for (unit in units) if (mult = units[unit], sec >= mult) return val = Math.floor(sec / mult),
    [ val, unit ];
    return [ "now", "" ];
  }, render = function() {
    var button, handler;
    return el = createFromHTML(TEMPLATE), document.body.appendChild(el), null != Offline.reconnect && Offline.getOption("reconnect") && (el.appendChild(createFromHTML(RETRY_TEMPLATE)),
    button = el.querySelector(".offline-ui-retry"), handler = function(e) {
      return e.preventDefault(), Offline.reconnect.tryNow();
    }, null != button.addEventListener ? button.addEventListener("click", handler, !1) :button.attachEvent("click", handler)),
    addClass("offline-ui-" + Offline.state), content = el.querySelector(".offline-ui-content");
  }, init = function() {
    return render(), Offline.on("up", function() {
      return removeClass("offline-ui-down"), addClass("offline-ui-up"), flashClass("offline-ui-up-2s", 2),
      flashClass("offline-ui-up-5s", 5);
    }), Offline.on("down", function() {
      return removeClass("offline-ui-up"), addClass("offline-ui-down"), flashClass("offline-ui-down-2s", 2),
      flashClass("offline-ui-down-5s", 5);
    }), Offline.on("reconnect:connecting", function() {
      return addClass("offline-ui-connecting"), removeClass("offline-ui-waiting");
    }), Offline.on("reconnect:tick", function() {
      var ref, time, unit;
      return addClass("offline-ui-waiting"), removeClass("offline-ui-connecting"), ref = roundTime(Offline.reconnect.remaining),
      time = ref[0], unit = ref[1], content.setAttribute("data-retry-in-value", time),
      content.setAttribute("data-retry-in-unit", unit);
    }), Offline.on("reconnect:stopped", function() {
      return removeClass("offline-ui-connecting offline-ui-waiting"), content.setAttribute("data-retry-in-value", null),
      content.setAttribute("data-retry-in-unit", null);
    }), Offline.on("reconnect:failure", function() {
      return flashClass("offline-ui-reconnect-failed-2s", 2), flashClass("offline-ui-reconnect-failed-5s", 5);
    }), Offline.on("reconnect:success", function() {
      return flashClass("offline-ui-reconnect-succeeded-2s", 2), flashClass("offline-ui-reconnect-succeeded-5s", 5);
    });
  }, "complete" === document.readyState ? init() :null != document.addEventListener ? document.addEventListener("DOMContentLoaded", init, !1) :(_onreadystatechange = document.onreadystatechange,
  document.onreadystatechange = function() {
    return "complete" === document.readyState && init(), "function" == typeof _onreadystatechange ? _onreadystatechange.apply(null, arguments) :void 0;
  });
}.call(this);

3、页面引用：上述脚本

4、JavaScript demo

var socketStatus=false;
function tanchuang(){
    Offline.check();
    if(!socketStatus){
        $('.big_toast div').html('网络连接已断开！');
        $('.big_toast').css('left', '45%');
        $('.big_toast').fadeIn("fast");
        $('.big_toast').fadeOut(2000);
        if(Offline.state === 'up' && websocket.reconnectAttempts>websocket.maxReconnectInterval){
            window.location.reload();
        }
    //    buildSocket();
    }else{
        websocket.send("{}");
    }
}
var websocket;
buildSocket();
function buildSocket(){
        if ('WebSocket' in window) {
            websocket = new ReconnectingWebSocket("ws://host/websocket/get/overview");
        } else if ('MozWebSocket' in window) {
            //   websocket = new MozWebSocket("ws://host/websocket/get/all/data/rt");
            websocket = new MozWebSocket("ws://host/websocket/get/overview");
        } else {
            //   websocket = new SockJS("http://192.168.1.114/sockjs/websocket/get/all/data/rt");
            websocket = new SockJS("http://host/websocket/get/overview");

        }

}
websocket.onopen = function (evnt) {
    socketStatus=true;
    clearInterval(t1);//去掉定时器
    t2=setInterval(tanchuang,3000);
    // tanchuang();
};
websocket.onmessage = function (evnt) {
};
websocket.onerror = function (evnt) {
    socketStatus=false;
};
websocket.onclose = function (evnt) {
    socketStatus=false;
};

最终的效果是：当网络断开连接后，会先重连3000次，如果3000次重连不上则浏览器放弃重连，开始监听网络状态，如果网络一恢复，则直接刷新页面，恢复数据正常。

博主开源项目：https://github.com/Enast/hummer，走过路过，请点个赞