我是javascript的新手。我试图这样做：
<head>
<title>DNS Check</title>
<script language="javascript" src="dnscheck.js"></script>
</head>
<body>
<table width="0%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="right">DOMAIN:</td>
<td align="left">
<input type="text" id="domainTxt" name="domainTxt">
</td>
</tr>
<tr>
<td align="center">
<input type="submit" id="submitBtn" value="Submit" onclick="dnsCheck('domainTxt')">
</td>
</tr>
</table>
</body>
dnscheck.js文件：
<script language="javascript" src="/home/dns.js" type="text/javascript">
// dns.js is file downloaded from node.js
function dnsCheck(domainTxt) {
var dns = require('dns'); // syntax error
dns.resolve4('www.google.com', function(err, addresses) {
if (err) throw err;
console.log('addresses: ' + JSON.stringify(addresses));
addresses.forEach(function(a) {
dns.reverse(a, function(err, domains) {
if (err) {
throw err;
}
console.log('reverse for ' + a + ': ' + JSON.stringify(domains));
});
});
});
}
</script>
但我在var dns = require('dns');