使用jquery创建表格，添加、删除行

 1 <label>Please indicate the number of attendees in your group including yourself.
 2     <select id="participants" class="input-mini required-entry">
 3         <option value="1">1</option>
 4         <option value="2">2</option>
 5         <option value="3">3</option>
 6         <option value="4">4</option>
 7         <option value="5">5</option>
 8         <option value="6">6</option>
 9         <option value="7">7</option>
10         <option value="8">8</option>
11         <option value="9">9</option>
12         <option value="10">10</option>
13         <option value="11">11</option>
14         <option value="12">12</option>
15         <option value="13">13</option>
16         <option value="14">14</option>
17         <option value="15">15</option>
18     </select></label>
19 
20 <table class="table table-hover" id="participantTable">
21   <thead>
22     <tr>
23       <th>&nbsp;</th>
24       <th>Name</th>
25       <th>Year</th>
26     </tr>
27   </thead>
28   <tr class="participantRow">
29     <td>&nbsp;</td>
30     <td><input name="" id="" type="text" placeholder="Name" class="required-entry">
31     </td>
32     <td>
33       <select name="" id="" class="required-entry">
34                     <option value=""></option>
35                 </select>
36     </td>
37     <td><button class="btn btn-danger remove" type="button">Remove</button></td>
38   </tr>
39   <tr id="addButtonRow">
40     <td colspan="4">
41       <center><button class="btn btn-large btn-success add" type="button">Add</button></center>
42     </td>
43   </tr>
44 </table>

 1 /* Variables */
 2 var p = $("#participants").val();
 3 var row = $(".participantRow");
 4 
 5 /* Functions */
 6 function getP() {
 7   p = $("#participants").val();
 8 }
 9 
10 function addRow() {
11   row.clone(true, true).appendTo("#participantTable");
12 }
13 
14 function removeRow(button) {
15   button.closest("tr").remove();
16 }
17 /* Doc ready */
18 $(".add").on(‘click‘, function() {
19   getP();
20   if ($("#participantTable tr").length < 17) {
21     addRow();
22     var i = Number(p) + 1;
23     $("#participants").val(i);
24   }
25   $(this).closest("tr").appendTo("#participantTable");
26   if ($("#participantTable tr").length === 3) {
27     $(".remove").hide();
28   } else {
29     $(".remove").show();
30   }
31 });
32 $(".remove").on(‘click‘, function() {
33   getP();
34   if ($("#participantTable tr").length === 3) {
35     //alert("Can‘t remove row.");
36     $(".remove").hide();
37   } else if ($("#participantTable tr").length - 1 == 3) {
38     $(".remove").hide();
39     removeRow($(this));
40     var i = Number(p) - 1;
41     $("#participants").val(i);
42   } else {
43     removeRow($(this));
44     var i = Number(p) - 1;
45     $("#participants").val(i);
46   }
47 });
48 $("#participants").change(function() {
49   var i = 0;
50   p = $("#participants").val();
51   var rowCount = $("#participantTable tr").length - 2;
52   if (p > rowCount) {
53     for (i = rowCount; i < p; i += 1) {
54       addRow();
55     }
56     $("#participantTable #addButtonRow").appendTo("#participantTable");
57   } else if (p < rowCount) {}
58 });