<html><body><p>您可以通过 selected 属性预选择某些选项。</p><form action="/demo/demo_form.asp"><select name="cars"><option value="volvo">Volvo</option><option value="saab">Saab</option><option value="fiat" selected>Fiat</option><option value="audi">Audi</option></select><br><br><input type="submit"></form></body></html>