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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
<style type="text/css">
.red{background:red;}
</style>
</head>
<body>
<div style="width:300px;height:300px;" id="b"></div>
<input type="button" id="a" value="点击测反应" onclick="go()"/>
<input type="button" id="s" value="停!" onclick="stop()"/>
<script type="text/javascript">
var a = Math.random()
var a = Math.floor(a*10000);
var btn = document.getElementById("a");
var can = document.getElementById("b");
function ceshi(){
d = new Date();
c = d.getTime();
b.className = "red";
}
function stop(){
e = new Date().getTime();
alert("你的反映时间为"+(e-c)/1000+"秒");
}
function go(){
b.className = "";
setTimeout(ceshi,a);
}
</script>
</body>