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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; var y=document.getElementById("mySelect").options; alert("索引:" + y[x].index + " is " + y[x].text); } </script> </head> <body> <form> 选择你最喜欢的水果: <select id="mySelect"> <option>Apple</option> <option>Orange</option> <option>Pineapple</option> <option>Banana</option> </select> </form> <button type="button" onclick="displayResult()">显示索引</button> </body> </html>
运行结果