<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function check(td) {
//alert(td.innerHTML);
var c = td.innerHTML;
var scoreT = document.getElementById("score").innerHTML;
var score = parseInt(scoreT);
if (td.style.background == "red") {
document.getElementById("score").innerHTML = score + 1;
td.style.background = "";
}
//alert(score+parseInt(c)+Math.floor(Math.random()*9));
;
}
var curTd = null;
setInterval(function() {
if (curTd != null)
curTd.style.background = "";
var num = Math.floor(Math.random() * 9) + 1;
var idNum = "td" + num;
//alert(idNum);
document.getElementById(idNum).style.background = "red";
curTd = document.getElementById(idNum);
}, 2000);
function calc(td) {
}
</script>
</head>
<body>
<div id="score">0</div>
<table style="width: 50%; height: 300px;" border="1">
<tr>
<td id="td1" οnclick="check(this)">1</td>
<td id="td2" οnclick="check(this)">2</td>
<td id="td3" οnclick="check(this)">3</td>
</tr>
<tr>
<td id="td4" οnclick="check(this)">4</td>
<td id="td5" οnclick="check(this)">5</td>
<td id="td6" οnclick="check(this)">6</td>
</tr>
<tr>
<td id="td7" οnclick="check(this)" >7</td>
<td id="td8" οnclick="check(this)">8</td>
<td id="td9" οnclick="check(this)">9</td>
</tr>
</table>
</body>
</html>