簡單的計時器
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script>
var i = 0;
var start;
window.onload = function(){
document.getElementById("btn").onclick = function(){
start = setInterval("addTime()",1000);
}
document.getElementById("clo").onclick = function(){
clearInterval(start);
}
}
function addTime(){
i++;
document.getElementById("show").innerHTML = i;
}
</script>
</head>
<body>
<div id="show"></div>
<button id="btn">開始計時</button>
<button id="clo">停止計時</button>
</body>
</html>
