1、浏览器信息

//浏览器信息

function BrowserInfo() {

    var userLanguage = navigator.userLanguage;     // 用户在自己的操作系统上设置的语言（火狐没有）

    var userAgent = navigator.userAgent;           //包含以下属性中所有或一部分的字符串：appCodeName,appName,appVersion,language,platform

    var systemLanguage = navigator.systemLanguage; // 用户操作系统支持的默认语言（火狐没有）

    var info = "";

    info += "浏览器属性信息： " + userAgent + "<br />";

    info += "用户设置的操作系统语言： " + userLanguage + "<br />";

    info += "操作系统支持的默认语言： " + systemLanguage + "<br />";

    return info;

}

2、客户端计算机硬件及系统信息

//CPU信息

function CpuInfo() {

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_Processor");

    var e = new Enumerator(properties);

    var info = "<table border=1>";

    info += "<tr  bgcolor='#CDEDED' style='font-weight: bold;' ><td width='450' >CPU 信息</td></tr>";

    for (; !e.atEnd(); e.moveNext()) {

        var p = e.item();

        info += "<tr style='color: red'><td >CPU序列号:" + p.ProcessorID + "</td></tr>";

        info += "<tr><td >" + p.Caption + "</td></tr>";

        info += "<tr><td >CPU编号：" + p.DeviceID + "</td></tr>";

        info += "<tr><td >CPU型号：" + p.Name + "</td></tr>";

        info += "<tr><td >CPU状态：" + p.CpuStatus + "</td></tr>";

        info += "<tr><td >CPU可用性：" + p.Availability + "</td></tr>";

        info += "<tr><td >CUP Level：" + p.Level + "</td></tr>";

        info += "<tr><td >主机名称：" + p.SystemName + "</td></tr>";

        info += "<tr><td >Processor Type：" + p.ProcessorType + "</td></tr>";

    }

    info += "</table>";

    return info;

}

//主板信息

function MainBoard() {

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_BaseBoard");

    var e = new Enumerator(properties);

    var info = "<table border=1>";

    info += "<tr bgcolor='#CDEDED' style='font-weight: bold;'><td width='450'>主板信息 </td></tr>";

    for (; !e.atEnd(); e.moveNext()) {

        var p = e.item();

        info += "<tr style='color: red'><td >主板ID：" + p.SerialNumber + "</td></tr>";

        info += "<tr><td >" + p.HostingBoard + "</td></tr>";

        info += "<tr><td >制造商：" + p.Manufacturer + "</td></tr>";

        info += "<tr><td >是否开启：" + p.PoweredOn + "</td></tr>";

        info += "<tr><td >型号：" + p.Product + "</td></tr>";

        info += "<tr><td >版本：" + p.Version + "</td></tr>";

    }

    info += "</table>";

    return info;

}

//Ram信息

function RamInfo(){

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var system=new Enumerator (service.ExecQuery("SELECT * FROM Win32_ComputerSystem")).item();

    var physicMenCap=Math.ceil(system.TotalPhysicalMemory/1024/1024);

    //内存信息

    var memory = new Enumerator (service.ExecQuery("SELECT * FROM Win32_PhysicalMemory"));

    for (var mem = [], i = 0; !memory.atEnd(); memory.moveNext()) {

        mem[i++] = { cap: memory.item().Capacity / 1024 / 1024, speed: memory.item().Speed };

    }

}  

//网络连接信息

function IpInfo(){

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_NetworkAdapterConfiguration Where IPEnabled=TRUE");

    var e = new Enumerator (properties);

    var info="<table border=1>";

    info+="<tr bgcolor='#CDEDED' style='font-weight: bold;' ><td width='450'>网络连接信息：</td></tr>";

    var i=1;

    for (;!e.atEnd();e.moveNext ()){

        var p = e.item ();

        info+="<tr style='color: red'><td >MAC地址"+i+"：" + p.MACAddress + "</td></tr>";

        info+="<tr style='color: red'><td >IP地址"+i+"：" + p.IPAddress(0) + "</td></tr>";

        i++;

    }

    info+="</table>";

    return info;

}

// 操作系统信息

function OsInfo() {

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_OperatingSystem");

    var e = new Enumerator(properties);

    var info = "<table border=1>";

    info += "<tr bgcolor='#CDEDED' style='font-weight: bold;' ><td width='450'>OS信息：</td></tr>";

    var i = 1;

    for (; !e.atEnd(); e.moveNext()) {

        var p = e.item();

        info += "<tr style='color: red'><td > " + p.BootDevice + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.BuildNumber + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.BuildType + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Caption + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.CodeSet + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.CountryCode + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.CreationClassName + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.CSCreationClassName + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.CSDVersion + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.CSName + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.CurrentTimeZone + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.DataExecutionPrevention_Available + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.DataExecutionPrevention_32BitApplications + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.DataExecutionPrevention_Drivers + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.DataExecutionPrevention_SupportPolicy + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Debug + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Description + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Distributed + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.EncryptionLevel + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.ForegroundApplicationBoost + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.FreePhysicalMemory + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.FreeSpaceInPagingFiles + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.FreeVirtualMemory + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.InstallDate + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.LargeSystemCache + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.LastBootUpTime + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.LocalDateTime + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Locale + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Manufacturer + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.MaxNumberOfProcesses + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.MaxProcessMemorySize + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Name + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.NumberOfLicensedUsers + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.NumberOfProcesses + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.NumberOfUsers + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.OperatingSystemSKU + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Organization + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.OSArchitecture + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.OSLanguage + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.OSProductSuite + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.OSType + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.OtherTypeDescription + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.PAEEnabled + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.PlusProductID + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.PlusVersionNumber + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.PortableOperatingSystem + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Primary + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.ProductType + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.RegisteredUser + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.SerialNumber + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.ServicePackMajorVersion + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.ServicePackMinorVersion + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.SizeStoredInPagingFiles + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Status + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.SuiteMask + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.SystemDevice + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.SystemDirectory + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.SystemDrive + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.TotalSwapSpaceSize + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.TotalVirtualMemorySize + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.TotalVisibleMemorySize + "</td></tr>";

        info += "<tr style='color: red'><td>" + p.Version + "</td></tr>";

        i++;

    }

    info += "</table>";

    return info;

}

//用户帐号信息

function UidInfo() {

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_UserAccount");

    var e = new Enumerator(properties);

    var info = "<table border=1>";

    info += "<tr bgcolor='#CDEDED' style='font-weight: bold;' ><td width='450'>用户帐号信息：</td></tr>";

    var i = 1;

    for (; !e.atEnd(); e.moveNext()) {

        var p = e.item();

        info += "<tr style='color: red'><td > " + i + ":" + p.AccountType + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.Caption + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.Description + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.Disabled + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.Domain + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.FullName + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.InstallDate + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.LocalAccount + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.Lockout + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.Name + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.PasswordChangeable + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.PasswordExpires + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.PasswordRequired + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.SID + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.SIDType + "</td></tr>";

        info += "<tr style='color: red'><td > " + i + ":" + p.Status + "</td></tr>";

        i++;

    }

    info += "</table>";

    return info;

}

//系统组帐号信息

function SysuidInfo() {

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_GroupUser");

    var e = new Enumerator(properties);

    var info = "<table border=1>";

    info += "<tr bgcolor='#CDEDED' style='font-weight: bold;' ><td colspan='3'>系统组帐号信息：</td></tr>";

    info += "<tr style='color: red'><td >id</td><td >GroupComponent</td><td >PartComponent</td></tr>";

    var i = 1;

    for (; !e.atEnd(); e.moveNext()) {

        var p = e.item();

        info += "<tr style='color: red'><td > " + i + "</td>";

        info += "<td>" + p.GroupComponent + "</td>";

        info += "<td>" + p.PartComponent + "</td></tr>";

        i++;

    }

    info += "</table>";

    return info;

}

//系统管理组信息

function SysmadInfo() {

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_Group");

    var e = new Enumerator(properties);

    var info = "<table border=1>";

    info += "<tr bgcolor='#CDEDED' style='font-weight: bold;' ><td colspan='10'>系统管理组信息：</td></tr>";

    info += "<tr style='color: red'><td >id</td><td >Caption</td><td >Description</td><td >Domain</td><td >InstallDate</td><td >LocalAccount</td><td >Name</td><td >SID</td><td >SIDType</td><td >Status</td></tr>";

    var i = 1;

    for (; !e.atEnd(); e.moveNext()) {

        var p = e.item();

        info += "<tr style='color: red'><td>" + i + "</td>";

        info += "<td>" + p.Caption + "</td>";

        info += "<td>" + p.Description + "</td>";

        info += "<td>" + p.Domain + "</td>";

        info += "<td>" + p.InstallDate + "</td>";

        info += "<td>" + p.LocalAccount + "</td>";

        info += "<td>" + p.Name + "</td>";

        info += "<td>" + p.SID + "</td>";

        info += "<td>" + p.SIDType + "</td>";

        info += "<td>" + p.Status + "</td></tr>";

        i++;

    }

    info += "</table>";

    return info;

}

//系统安装的服务信息

function SysserInfo() {

    var locator = new ActiveXObject("WbemScripting.SWbemLocator");

    var service = locator.ConnectServer(".");

    var properties = service.ExecQuery("SELECT * FROM Win32_Service");

    var e = new Enumerator(properties);

    var info = "<table border=1>";

    info += "<tr bgcolor='#CDEDED' style='font-weight: bold;' ><td colspan='26'>系统安装的服务信息：</td></tr>";

    info += "<tr style='color: red'><td>id</td><td>AcceptPause</td><td>AcceptStop</td><td>Caption</td><td>CheckPoint</td><td>CreationClassName</td><td>Description</td><td>DesktopInteract</td><td>DisplayName</td><td>ErrorControl</td><td>ExitCode</td><td>InstallDate</td><td>Name</td><td>PathName</td><td>ProcessId</td><td>ServiceSpecificExitCode</td><td>ServiceType</td><td>Started</td><td>StartMode</td><td>StartName</td><td>State</td><td>Status</td><td>SystemCreationClassName</td><td>SystemName</td><td>TagId</td><td>WaitHint</td></tr>";

    var i = 1;

    for (; !e.atEnd(); e.moveNext()) {

        var p = e.item();

        info += "<tr style='color: red'><td> " + i + "</td> ";

        info += " <td>" + p.AcceptPause + "</td> ";

        info += " <td>" + p.AcceptStop + "</td> ";

        info += " <td>" + p.Caption + "</td> ";

        info += " <td>" + p.CheckPoint + "</td> ";

        info += " <td>" + p.CreationClassName + "</td> ";

        info += " <td>" + p.Description + "</td> ";

        info += " <td>" + p.DesktopInteract + "</td> ";

        info += " <td>" + p.DisplayName + "</td> ";

        info += " <td>" + p.ErrorControl + "</td> ";

        info += " <td>" + p.ExitCode + "</td> ";

        info += " <td>" + p.InstallDate + "</td> ";

        info += " <td>" + p.Name + "</td> ";

        info += " <td>" + p.PathName + "</td> ";

        info += " <td>" + p.ProcessId + "</td> ";

        info += " <td>" + p.ServiceSpecificExitCode + "</td> ";

        info += " <td>" + p.ServiceType + "</td> ";

        info += " <td>" + p.Started + "</td> ";

        info += " <td>" + p.StartMode + "</td> ";

        info += " <td>" + p.StartName + "</td> ";

        info += " <td>" + p.State + "</td> ";

        info += " <td>" + p.Status + "</td> ";

        info += " <td>" + p.SystemCreationClassName + "</td> ";

        info += " <td>" + p.SystemName + "</td> ";

        info += " <td>" + p.TagId + "</td> ";

        info += " <td>" + p.WaitHint + "</td></tr>";

        i++;

    }

    info += "</table>";

    return info;

}  

代码实现主要包括这几部分：  
        先通过new ActiveXObject ("WbemScripting.SWbemLocator"); 访问到WbemScripting对象。
       通过locator.ConnectServer(".");连接我们本地电脑（.代表本地电脑，当然也可以访问其他计算机）。
      通过service.ExecQuery("SELECT * FROM Win32_Processor")这个类似sql的语句（其实系统信息也是存储在计算中一个类似数据库的文件中）获取我们需要的对象的记录  集。
        通过new Enumerator来创建一个可枚举的对象，下面就可以遍历取信息了。
注意：运行的前提是要修改浏览器安全设置，“允许对未标记为可安全执行的ActiveX脚本的运行”。

这里主要取了CPU、内存及系统用户几个信息，大家利用WMI的API或者借助JSEDIT获取
到更多的信息。下面列出了常用信息的类：

Win32_Processor                        // CPU 处理器

Win32_PhysicalMemory                   // 物理内存

Win32_Keyboard                         // 键盘

Win32_PointingDevice                   // 点输入设备，如鼠标

Win32_DiskDrive                        // 硬盘驱动器

Win32_CDROMDrive                       // 光盘驱动器

Win32_BaseBoard                        // 主板

Win32_BIOS                             // BIOS 芯片

Win32_ParallelPort                     // 并口

Win32_SerialPort                       // 串口

Win32_SoundDevice                      // 多媒体设置

Win32_USBController                    // USB 控制器

Win32_NetworkAdapter                   // 网络适配器

Win32_NetworkAdapterConfiguration      // 网络适配器设置

Win32_Printer                          // 打印机

Win32_PrinterConfiguration             // 打印机设置

Win32_PrintJob                         // 打印机任务

Win32_TCPIPPrinterPort                 // 打印机端口

Win32_POTSModem                        // MODEM

Win32_POTSModemToSerialPort            // MODEM 端口

Win32_DesktopMonitor                   // 显示器

Win32_VideoController                  // 显卡细节。

Win32_VideoSettings                    // 显卡支持的显示模式。

Win32_TimeZone                         // 时区

Win32_SystemDriver                     // 驱动程序

Win32_DiskPartition                    // 磁盘分区

Win32_LogicalDisk                      // 逻辑磁盘

Win32_LogicalMemoryConfiguration       // 逻辑内存配置

Win32_PageFile                         // 系统页文件信息

Win32_PageFileSetting                  // 页文件设置

Win32_BootConfiguration                // 系统启动配置

Win32_OperatingSystem                  // 操作系统信息

Win32_StartupCommand                   // 系统自动启动程序

Win32_Service                          // 系统安装的服务

Win32_Group                            // 系统管理组

Win32_GroupUser                        // 系统组帐号

Win32_UserAccount                      // 用户帐号

Win32_Process                          // 系统进程

Win32_Thread                           // 系统线程

Win32_Share                            // 共享

Win32_NetworkClient                    // 已安装的网络客户端

Win32_NetworkProtocol                  // 已安装的网络协议

WMI Win32类的完整信息及详细列表请参考MSDN:
http://msdn2.microsoft.com/en-us/library/aa394084(VS.85).aspx