websocket 心跳机制

var heartCheck = {
  timeout: 60000, //60ms
  timeoutObj: null,
  serverTimeoutObj: null,
  reset: function () {
    clearTimeout(this.timeoutObj);
    clearTimeout(this.serverTimeoutObj);
    this.start();
  },
  start: function () {
    var self = this;
    this.timeoutObj = setTimeout(function () {
      ws.send("HeartBeat");
      self.serverTimeoutObj = setTimeout(function () {
        ws.close(); //如果onclose会执行reconnect，我们执行ws.close()就行了.如果直接执行reconnect 会触发onclose导致重连两次
      }, self.timeout);
    }, this.timeout);
  },
};

ws.onopen = function () {
  heartCheck.start();
};
ws.onmessage = function (event) {
  heartCheck.reset();
};

ws.onclose = function () {
  reconnect();
};
ws.onerror = function () {
  reconnect();
};