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_interval =new Date().getTime() - d;
d = new Date().getTime();d = new Date().getTime();
_interval =new Date().getTime() - d;<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>测试页</title>
<script type="text/javascript">
var count = 0
var timer
function c()
{
count ++;
timer = window.setTimeout(function(){
if(count==1) alert("单击")
else alert("双击")
window.clearTimeout(timer)
count=0
},500)
}
</script>
</head>
<body>
<input name="test" id="test" type="button" onmouseup="c()" value="单双击测试"/>
</body>
</html>