1. A method for implementing an instant messaging application, comprising: receiving source data sent from a third party server, wherein a tag of an instant messaging application is embedded in the source data; displaying a user login window, on a third party interface displayed based on the source data, based on a script or a Software Development Kit of the instant messaging application and the tag of the instant messaging application; acquiring information of a first login user inputted in the user login window; sending the information of the first login user to a server of the instant messaging application based on an address of the server obtained by resolving the script or the Software Development Kit of the instant messaging application, so that the server of the instant messaging application detects whether the information of the first login user is correct; and displaying an instant messaging application identifier of the first login user on the third party interface based on the script or the Software Development Kit of the instant messaging application, when the information of the first login user is correct.