var config = {
  authDomain: "samplechat.wilddog.com",
  syncURL: "https://samplechat.wilddogio.com"
};
wilddog.initializeApp(config);
var currentServerTime = wilddog.sync().ref("servertimestamp");

//存入当前云端时间戳
currentServerTime.set(wilddog.sync().ServerValue.TIMESTAMP);

var config = {
  authDomain: "samplechat.wilddog.com",
  syncURL: "https://samplechat.wilddogio.com"
};
wilddog.initializeApp(config);
var serverTsRef = wilddog.sync().ref("/.info/serverTimeOffset");

serverTsRef.once('value',function(snapshot){
  // 获取时钟偏差
  var offset = snapshot.val();
  // 可进一步计算出云端时间
  serverTime = (new Date).getTime() + offset;
})