第一步：开启gero Javascript交互

第二步：插入以下代码

var startBlock = sero.syncing.currentBlock
var b_times = 0
var b_time = 10 * 1000
var c = 0
var sid = setInterval(function(){
var nowData = sero.syncing
if(nowData != false){
  var blocks = nowData.currentBlock - startBlock;
  b_times += 1
  console.info(" 总区块：" + nowData.highestBlock)
  console.info(" 当前区块：" + nowData.currentBlock)
  console.info(" >>> 同步进度：" + (nowData.currentBlock / nowData.highestBlock * 100).toFixed(10) + "%")
  console.info(" >>> 已同步区块：" + blocks)
  console.info(" >>> 预计剩余时间：" + ( (nowData.highestBlock - nowData.currentBlock)/(blocks/(b_time*b_times/1000))/60).toFixed(2) + '分钟')
  console.info("------------------------------------")
  c = 0
}
else {
  console.info("同步完成！正在确认...")
  if(c == 3){
    clearTimeout(sid)
    console.info("同步完成！取消观察模式！")
  }
  else {
    c += 1
  }
}
},b_time)