<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
input{
width: 80px;
height: 20px;
}
</style>
</head>
<body>
<input type="number" name="" value="">
<input type="number" name="" value="">
<button>查询</button>
<script>
var input = document.getElementsByTagName('input');
var btn = document.getElementsByTagName('button')[0];
function nf (n,f){
var count = 0;
for(var a = n;a < f-1;a++){
if(a % 4 == 0 && a % 100 != 0 || a % 400 == 0 ){
count++;
document.write(a + ' ');
if(count % 4 == 0){
document.write("<br>");
}
}
}
}
btn.onclick = function(){
var n = input[0].value;
var f = input[1].value;
nf(n,f)
}
</script>
</body>
</html>
