<body>
<form name="form1">
전화하는 시간은
<input type="text" size="10" name="formSec">
입니다<br>
전화요금은
<input type="text" size="10" name="formWon">
입니다
</form>
<button onclick="document.bgColor='#ffff00'">배경색 변경</button>
ba<bgsoundColor>
<script type="text/javascript">
var myCnt = 1;
function func() {
document.form1.formSec.value = myCnt + "초";
document.form1.formWon.value = ((Math.floor(myCnt/5) * 10) + 10 ) + "원";
myCnt = myCnt + 1;
}
setInterval("func()", 100);
</script>
<실행>
