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<!DOCTYPE html> <html> <body> <form id="myForm"> <select id="mySelect"> <option>苹果</option> <option>Pear</option> <option>香蕉</option> <option>橙子</option> </select> </form> <p>表格的ID是：<p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = document.getElementById("mySelect").form.id; </script> </body> </html>