<!DOCTYPE html>
<html>
<head>
<script>
function sub()
{
var a=(abc.a.value);
var b=(abc.b.value);
for(a=a; a<=11; a+=b)
{
document.write(a+b+"<br>");
}
}
</script>
</head>
<body>
<form name="abc">
起始<input type="text" name="a" value=""><br>
差值<input type="text" name="b" value=""><br>
<input type="submit" onclick="sub()">
</form>
</body>
</html>