The pop-up window referred to the prompt messages that popped up automatically when the website read the novel, such as recommended content, advertisements, pop-up reminders, and so on. These pop-up windows appeared mainly because the website took a measure to improve the user experience. The pop-up window could bring convenience to the user. For example, when reading a novel, the pop-up window could remind the user to update, download, comment, and other information to facilitate the user to carry out relevant operations. At the same time, the pop-up window could also bring more traffic and income to the website because users would open the pop-up window frequently, thus increasing the exposure of the website. However, the pop-up window would also bring discomfort to the readers because it would interfere with the user's reading experience. In addition, the pop-up window could also cause the user to make mistakes, such as clicking on the wrong link or downloading a file, causing damage to the account or device. Therefore, the pop-up window was a measure taken by the website to improve the user experience, but it also needed to be used reasonably according to the specific situation to avoid unnecessary trouble for the readers.