关于js转换时间戳

直接上代码吧：

formatDate(timestamp) {        var date = new Date(parseInt(timestamp));        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() + ':';        var s = date.getSeconds();        var datetime = Y + M + D + h + m + s        return datetime;      }