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Input Text value 属性
tryjsref_text_value_dropdown
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<!DOCTYPE html> <html> <body> <form> Select your favorite browser: <select id="myList" onchange="myFunction()"> <option></option> <option>Google Chrome</option> <option>Firefox</option> <option>Internet Explorer</option> <option>Safari</option> <option>Opera</option> </select> <p>Your favorite browser is: <input type="text" id="demo" size="20"></p> </form> <script> function myFunction() { var mylist = document.getElementById("myList"); document.getElementById("demo").value = mylist.options[mylist.selectedIndex].text; } </script> </body> </html>