js毫秒值转化为标准日期格式

function getDate(str) {
    var oDate = new Date(str),
    oYear = oDate.getFullYear(),
    oMonth = oDate.getMonth()+1,
    oDay = oDate.getDate(),
    oHour = oDate.getHours(),
    oMin = oDate.getMinutes(),
    oSen = oDate.getSeconds(),
    oTime = oYear +'-'+ addZero(oMonth) +'-'+ addZero(oDay) +' '+ addZero(oHour) +':'+
addZero(oMin) +':'+addZero(oSen);
    return oTime;
}

//补零操作
function addZero(num){
    if(parseInt(num) < 10){
        num = '0'+num;
    }
    return num;
}