我正在插入多個數據。當我從下拉列表中選擇一個項目時，會發生什么。它會保存所有選擇的數據。請先檢查下面的圖片    function sample($con){  $select = "SELECT * FROM project_tbl";  $select_result = mysqli_query($con,$select);    if (mysqli_num_rows($select_result)> 0) {      while ($row = mysqli_fetch_assoc($select_result)) {        echo "<option value=".$row['project_name'].">" .$row['project_name']."</option>";      }    }  }* html代碼（我使用下拉列表填充數據庫中的數據）<td class="pro">  <select class="pro">  <option value=""><?php sample($con); ?></option>  </select>   </td>* ajax代碼（添加，保存和刪除）$(document).ready(function(){ var count = 1; $('#add').click(function(){  count = count + 1;  var html_code = "<tr id='row"+count+"'>";  html_code += "<td class='pro'><select class='pro'><option value=''><?php sample($con); ?></option></select></td>";  html_code += "<td contenteditable='true' class='desc'></td>";  html_code += "<td contenteditable='true' class='comp'></td>";  html_code += "<td contenteditable='true' class='entry'></td>";  html_code += "<td contenteditable='true' class='remarks'></td>";  html_code += "<td><button type='button' name='remove' data-row='row"+count+"' class='btn btn-outline-danger btn-xs remove' title='remove'><i class='fa fa-times' aria-hidden='true'></i></button></td>";  html_code += "</tr>";    $('#crud_table').append(html_code); });  $(document).on('click', '.remove', function(){  var delete_row = $(this).data("row");  $('#' + delete_row).remove(); });  $('#save').click(function(){    var desc = [];    var pro = [];    var comp = [];    var entry = [];    var remarks = [];    $('.desc').each(function(){    desc.push($(this).text());    });    $('.pro').each(function(){    pro.push($(this).text());    });    $('.comp').each(function(){    comp.push($(this).text());    });    $('.entry').each(function(){    entry.push($(this).text());    });    $('.remarks').each(function(){    remarks.push($(this).text());    });這是我保存時發生的情況。