js动态实时时间

<label id="date"></label>
<script>
setInterval(function(){
    currentDate();
}, 1000);
function currentDate()
{
    let date = new Date();
    document.getElementById("date").innerHTML =  
        date.getFullYear() + '-' + 
        (date.getMonth() + 1).toString().padStart(2, '0') + '-' +
        (date.getDate()).toString().padStart(2, '0') + ' ' +
        (date.getHours()).toString().padStart(2, '0') + ':' +
        (date.getMinutes()).toString().padStart(2, '0') + ':' +
        (date.getSeconds()).toString().padStart(2, '0')
}
</script>