js 时间戳转字符串

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