<script type="text/javascript">
var year = prompt('请输入年份');
if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0){
alert(year + '是闰年');
}else{
alert(year + '是平年');
}
</script>
Algorithm-JS implementation of flat leap year judgment
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Origin blog.csdn.net/qq_41685741/article/details/114667714
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