<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>判断一个数字是整数还是小数</title>
</head>

<body>
<div id="box"></div>
<script type="text/javascript">
var number=123.456
if(parseInt(number)==number){
    alert('是整数');
}else{
    alert('不是整数');
}

</script>
</body>
</html>