- 当前 Bug 的表现（可附上截图）

- 预期表现

    Year:2019

- 复现路径

- 提供一个最简复现 Demo

function addYear(sdate, syear) {

  console.log('curDate:' + sdate)

  var year = sdate.getFullYear()

  console.log('Year:' + year)

  var month = sdate.getMonth() + 1

  var day = sdate.getDate()

  var hour = sdate.getHours()

  var minute = sdate.getMinutes()

  var second = sdate.getSeconds()

  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')

}