A method for logging in to a second website through a first website using a password-free proxy, wherein i) both the first website and the second website run on a browser installed on a user device and ii) the password-free proxy is set for the second website in a running environment comprising the user device and browser, the method comprising: in response to receiving, by the first website, a website jump trigger, obtaining a first token stored in cookies of the browser that the first website runs on, wherein the first token comprises i) a website identifier of the second website on a second website list page indicated by the website jump trigger and ii) a device fingerprint of the user device, wherein the device fingerprint is used to indicate where password-free proxy login is set for the second website; in response to determining, by the first website and based on the device fingerprint, that a current running environment is the same as the running environment in which password-free proxy login is set for the second website i) obtaining, by the first website, a second token that corresponds to the first token, wherein the second token comprises an access token indicating that the second website grants password-free login permission after a user of the user device successfully logs in to the second website, ii) sending, through the password-free proxy, by the first website and based on the website identifier in the first token, a password-free login request comprising a third token to the second website that corresponds to the website identifier, wherein the third token comprises the second token, and iii) logging the user in to the second website without a password when the second website successfully verifies that the second token is in the third token received from the first website. in response to receiving, by the first website, a website jump trigger, obtaining a first token stored in cookies of the browser that the first website runs on, wherein the first token comprises i) a website identifier of the second website on a second website list page indicated by the website jump trigger and ii) a device fingerprint of the user device, wherein the device fingerprint is used to indicate where password-free proxy login is set for the second website; i) a website identifier of the second website on a second website list page indicated by the website jump trigger and ii) a device fingerprint of the user device, wherein the device fingerprint is used to indicate where password-free proxy login is set for the second website; in response to determining, by the first website and based on the device fingerprint, that a current running environment is the same as the running environment in which password-free proxy login is set for the second website i) obtaining, by the first website, a second token that corresponds to the first token, wherein the second token comprises an access token indicating that the second website grants password-free login permission after a user of the user device successfully logs in to the second website, ii) sending, through the password-free proxy, by the first website and based on the website identifier in the first token, a password-free login request comprising a third token to the second website that corresponds to the website identifier, wherein the third token comprises the second token, and iii) logging the user in to the second website without a password when the second website successfully verifies that the second token is in the third token received from the first website. i) obtaining, by the first website, a second token that corresponds to the first token, wherein the second token comprises an access token indicating that the second website grants password-free login permission after a user of the user device successfully logs in to the second website, ii) sending, through the password-free proxy, by the first website and based on the website identifier in the first token, a password-free login request comprising a third token to the second website that corresponds to the website identifier, wherein the third token comprises the second token, and iii) logging the user in to the second website without a password when the second website successfully verifies that the second token is in the third token received from the first website.