<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Math </title>
<script type="text/javascript">
var c
var x
function y()
{
c=Math.random()*10
x=Math.round(c));
document.getElementById("result").value=x
}
</script>
</head>
<body>
<input type=button value="重置" onclick="y()" /><br/>
随机值四舍五入结果为<input type=text id="result">
</body>
</html>
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