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<!DOCTYPE html> <html> <head> <script> function preferedBrowser() { prefer = document.forms[0].browsers.value; alert("You prefer browsing internet with " + prefer); } </script> </head> <body> <form> 选择您喜欢的浏览器： <select id="browsers" onchange="preferedBrowser()"> <option value="Chrome">Chrome</option> <option value="Internet Explorer">Internet Explorer</option> <option value="Firefox">Firefox</option> </select> </form> </body> </html>