js 将时间戳转为日期

    timestampToTime:function(timestamp) {
                    var date = new Date(timestamp * 1000);//时间戳为10位需*1000，时间戳为13位的话不需乘1000
                    var Y = date.getFullYear() + ".";
                    var M = (date.getMonth()+1 < 10 ? "0"+(date.getMonth()+1) : date.getMonth()+1) + ".";
                    var D = date.getDate() + " ";
                    var h = date.getHours() + ":";
                    var m = date.getMinutes() ;
                    return Y+M+D;
            }