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用JavaScript检测你输入的年份是否是闰年，而且也可以输入一段年份，然后计算出这段年份中属于闰年的年份有多少，并列出来。想用的可以再美化一下页面。
<html> <head> <title>JavaScript检测闰年</title> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin function checkYear(year) { return (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) ? 1 : 0; } function leap(form) { year = form.year.value; var Check1 = parseFloat(year); for (var i = 0; i < year.length; i++) { var sLetterCheck1 = year.substring(i, i+1); if (sLetterCheck1 < "0" || sLetterCheck1 > "9") { alert("Enter a valid year."); form.year.focus(); form.year.select(); return; } } if (year < 1582) { form.result.value = ""; alert("您必须输入大于1581的年份"); form.year.focus(); form.year.select(); return; } checkYear(year); if (!checkYear(year)) form.result.value = "不是闰年"; else form.result.value = "是闰年"; } function MakeArray(n) { if (n <= 0) { this.length = 0; return this; } this.length = n; for (var i = 1; i <= n; i++) { this[i] = 0; } return this; } var listArray = new MakeArray(160); var index = 0; function list(form) { startyear = form.startyear.value; endyear = form.endyear.value; var Check1 = parseFloat(startyear); var Check2 = parseFloat(endyear); for (var i = 0; i < startyear.length; i++) { var sLetterCheck1 = startyear.substring(i, i+1); if (sLetterCheck1 < "0" || sLetterCheck1 > "9") { alert("Enter a valid start year."); form.startyear.focus(); form.startyear.select(); return; } } for (var i = 0; i < endyear.length; i++) { var sLetterCheck2 = endyear.substring(i, i+1); if (sLetterCheck2 < "0" || sLetterCheck2 > "9") { alert("Enter a valid end year."); form.endyear.focus(); form.endyear.select(); return; } } if (startyear < 1582) { form.yearlist.value = ""; alert("开始年份必须大于1581."); form.startyear.focus(); form.startyear.select(); return; } else if (endyear <= startyear) { form.yearlist.value = ""; alert("结束年份必须大于开始年"); form.endyear.focus(); form.endyear.select(); return; } else { index = 0; for (var i=startyear; i <=endyear; i++) { if (checkYear(i)) { listArray[index] = i; index++; } } } var allYears; allYears = ""; for( i = 0; i < index; i++ ) { allYears += listArray[i] + "\r" + "\n"; form.yearlist.value = allYears; } } // End --> </script> <form> 年份： <input type=text name=year size=4> <input type=button value="检测一下" onClick="leap(this.form);" name="button"> <input type=text name=result size=15><br> 检测某段时间的闰年： 开始年份：<input type=text name=startyear size=5> 结束年份：<input type="text" name="endyear" size=5> <input type=button name=listyears value="年份列表" onClick="list(this.form);"> <textarea name=yearlist rows=10 cols=11>