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【10行】Javascriptで与えられた日の週の月曜を出す

JavaScript

Last updated at 2021-02-17Posted at 2020-10-04


<html><body>
<script>

var date = new Date();
while(true) {
    if(date.getDay() == 1) break;
    date = new Date(date.getFullYear(), date.getMonth(), date.getDate() - 1);
}

document.write(date.getFullYear() + "/" + (date.getMonth() + 1) + "/" + date.getDate());

</script>
</body></html>

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