javascript时间戳 转换成时间

function a(m){    return m<10?'0'+m:m     }function formatDate(time) {     var now = new Date(time);    var year=now.getFullYear();     var month=now.getMonth()+1;     var date=now.getDate();     var hour=now.getHours();     var minute=now.getMinutes();     var second=now.getSeconds();     return year+"-"+a(month)+"-"+a(date)+" "+a(hour)+":"+a(minute)+":"+a(second); } print(formatDate(1497244632441));##2017-06-12 13:17:12