js中时间戳与日期时间之间的相互转换

function timeFormat(dateStr) {
        var date = new Date(dateStr);
        Y = date.getFullYear() + '-';
        M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1) : date.getMonth()+1) + '-';
        D = date.getDate() + ' ';
        h = (date.getHours() < 10 ? '0' + date.getHours() : date.getHours()) + ':';
        m = (date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes()) + ':';
        s = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds();
        return Y+M+D+h+m+s;
    }
function timeFormat(d