This example demonstrates a simple user interface for selecting and previewing sound effects using native JavaScript event handling. The page provides a dropdown menu with four sound options and a "试听" (preview) button that triggers playback of a fixed audio file hosted remotely. The code uses the HTML `select` and `button` elements, with an inline `onclick` handler invoking the `playsound()` function. This function accesses the `audio` element by ID and calls its `play()` method, relying on the browser’s built-in HTML5 audio API rather than any external visualization libraries.