我在獲取 onchange 函數的輸入值時遇到問題。下面是我的編碼： <div class="form-group"> <label>Choose Book:<span style="color:red;">&nbsp;*</span></label> <select class="form-control" id="publisher" name="publisher" title="publisher"> <option value="">Please Select</option> <?php $sql_branch = 'select * from book_lending where status=1 order by id'; $arr_branch = db_conn_select($sql_branch); foreach ($arr_branch as $rs_branch) { echo '<option value="' . $rs_branch['id'] . '">' . $rs_branch['title'] . '</option>'; } ?></select>  </div> <div class="form-group"> <label for="cp1" class="control-label">Book Stock<span style="color:red;">&nbsp;*</span></label> <input readonly="readonly" type="text" class="form-control" id="editor" name="editor" title="editor" value="" > </div><script>$(function(){    $("#publisher").change(function(){        var displayid=$("#publisher option:selected").text();        $("editor").val(displayid);    })})</script>下面是輸出圖片：如果我在 id is publisher 中 onchange 我需要顯示輸入值，然后 id editor 將顯示該值。希望有人能指導我我弄錯了哪一部分。謝謝。