js格式化日期

function timeStamp2String(time) {
            var datetime = new Date();
            datetime.setTime(time);
            var year = datetime.getFullYear();
            var month = datetime.getMonth() + 1 < 10 ? "0" + (datetime.getMonth() + 1) : datetime.getMonth() + 1;
            var date = datetime.getDate() < 10 ? "0" + datetime.getDate() : datetime.getDate();
            var hour = datetime.getHours() < 10 ? "0" + datetime.getHours() : datetime.getHours();
            var minute = datetime.getMinutes() < 10 ? "0" + datetime.getMinutes() : datetime.getMinutes();
            var second = datetime.getSeconds() < 10 ? "0" + datetime.getSeconds() : datetime.getSeconds();
            return year + "-" + month + "-" + date;
        }