Javascript 内核Bug:
js 执行（9.9+19.8）加法运算 等于 29.700000000000003)
<html>
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head>
<body>
<script type="text/javascript">
<!--
alert(9.9+19.8);
//-->
</script>
</body>
</html>