How to get local username in javascript

JavaScript is a scripting language that is commonly used in web development. It can be used to obtain local user names to facilitate users to log in and verify on the website. Below, we will introduce several JavaScript methods to obtain local user names.

1. Using the navigator object

You can obtain browser information through the navigator object in JavaScript, including the user's operating system information and browser information. So we can use it to get the local username.

The code is as follows:

var userName = navigator.oscpu;

The disadvantage of this method is that it is not very accurate, because the user may use a virtual machine or shared resource environment, and the operating system information obtained at this time may not necessarily be Current username.

2. Use ActiveXObject object

ActiveXObject is an object supported by IE browser and can be used to obtain the user's user name.

The code is as follows:

var network = new ActiveXObject('WScript.Network');
var userName = network.UserName;

This method needs to be used in the IE browser, and if the user closes the ActiveX control, the user name cannot be obtained.

3. Using the XMLHttpRequest object

The XMLHttpRequest object is a JavaScript object used to exchange data with the server in the background. It can also be used to obtain the local user name.

The code is as follows:

var xhr = new XMLHttpRequest();
xhr.open('GET', '/', false, '', '');
xhr.send('');
var userName = xhr.getResponseHeader('X-Client-User');

This method needs to set the response header information on the server side so that it can be obtained on the client side.

4. Using Java Applet objects

Java Applet is a technology that can embed Java programs in web pages. The user's user name can be obtained through Java Applet.

The code is as follows:

<APPLET
    codebase="your.class.file"
    code="AppletClassName.class"
    width="0" height="0">
</APPLET>

import java.applet.Applet;
import java.awt.Graphics;

public class AppletClassName extends Applet {

    public void paint(Graphics g) {
        String userName = System.getProperty("user.name");
        g.drawString("User Name: " + userName, 0, 0);
    }
}

This method requires the user's browser to support Java Applets, and requires the user to install the specified Java plug-in and authorization.

To sum up, the above are several JavaScript methods to obtain local user names. Different methods have their own advantages and disadvantages, and they need to be selected according to the actual situation. During development, compatibility and security should be considered to prevent user information from being leaked.

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