使用selected属性指定在HTML中加载页面时应预先选择该选项。您可以尝试运行以下代码以实现所选属性-
<!DOCTYPE html> <html> <head> <title>HTML selected attribute</title> </head> <body> <p>Here's the list of subjects. Select any one:</p> <form> <select name = "dropdown"> <option value = "Computer Architecture" selected>Computer Architecture</option> <option value = "Java">Java</option> <option value = "Discrete Mathematics">Discrete Mathematics</option> </select> </form> </body> </html>