<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title></head><body></body></html><script type="text/javascript">var runNian = parseInt(prompt("请输入年份"))if(runNian%4 == 0 && runNian%100 !== 0 || runNian%400 ==0 ){alert("闰年")}else{alert("不是闰年")}</script>JS怎样写闰年
原文地址：https://www.cnblogs.com/hankai2735/p/8760947.html