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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>小鸟启蒙(facesoho.com)</title> <script> function displayResult(){ var x=document.getElementById("mySelect").selectedIndex; alert(document.getElementsByTagName("option")[x].value); } </script> </head> <body> <form> 选择你最喜欢的水果: <select id="mySelect"> <option value="apple">Apple</option> <option value="orange">Orange</option> <option value="pineapple">Pineapple</option> <option value="banana">Banana</option> </select> </form> <button type="button" onclick="displayResult()">选择的水果的值。</button> </body> </html>
运行结果