how to get host IP and port number on which the ap

问题:

can anyone tell me how to get host IP and port number on which the web application is running using javascript (e.g. 127.0.0.1:8080)

回答1:

I'm afraid it's not possible to directly obtain the IP address via Javascript. It's not exposed in the window.location object.

Part of the reason for that is that subsequently accessing address:port is not semantically the same as accessing hostname:port - they are technically different URLs.

If what you're actually after is the host portion of the URL from which the current webapp was downloaded, you need:

window.location.hostname
window.location.port

The latter could be blank if the "default" port is being used, so you would also need to read:

window.location.protocol

and check whether it's http: (i.e. port 80) or https: (port 443).

You can also use:

window.location.host

which will contain both the hostname and the port as colon-separated strings, with the same caveat as above that the :port section will be omitted if the content was accessed via the "default" port for the protocol.

回答2:

document.location.host      // localhost:1234
document.location.hostname  // localhost
document.location.port      // 1234