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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</head>
<body>
<script language=javascript>
<!--
var test1=1;
var test2=1,temp;
test1<<=31;
alert(test1);
temp=test2*256*256*256*128;
alert(temp);
//-->
</script>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>例子</title>
<script type="text/javascript">
function IPNumber(ip)
{
var ips = ip.split('.');
return ips[0]*256*256*256 + ips[1]*256*256 + ips[2]*256 + ips[3];
}
alert(IPNumber("255.255.255.255"));
</script>
</head>
<body>
</body>
</html>
怎么我怎么算都不会出现负数呢?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>例子</title>
<script type="text/javascript">
var test = 16;
alert(test.toString(16));
</script>
</head>
<body>
</body>
</html>