This may be because the program or browser plug-in in the computer is infected with malicious software or advertising plug-in. You can try the following steps to solve this problem: 1. Scan your computer with anti-virus software, find out malicious software and remove them. 2. Update your browser, disable all unnecessary browser plug-ins and extensions, and only use necessary security plug-ins. 3. Check whether your browser's default home page and search engine settings have been changed to jiayuan. If so, please reset it to the original settings. 4. If you still can't solve the problem, you can try to use other browsers or visit on other devices to see if the problem still exists. If none of the above methods work, I suggest you contact a computer or network professional for help.