Javascript Handlebar和js：在for循环内部分配不同的id值，并在循环外部引用它们

在我的网页中，我正在使用手柄填充表格，并从数据库中获取值：

<table>
  <tbody id="myDiv">
  {{# each alarms}}
    <tr class="row100 body">
      <td class="cell100 column1"><a href="#" id="btn_exp">{{ this.alm_id }}</a></td>
      <td class="cell100 column2><a href="#">{{ this.message }}</a></td>
      <td class="cell100 column3"><a href="#">{{ this.level }}</a></td>
    </tr>
  {{/each}}
  </tbody>
</table>

{{{#每个警报}
使用类的方法比IDs更有效。类是将标识符应用于类似元素的好方法。在这种情况下，您需要一种方法将单击事件应用于多个
btn exp

要将数据传递给元素，请利用元素上的To data属性。您可以将所需的任何数据从句柄栏传递到属性中，稍后在JavaScript中进行访问

<table>
  <tbody id="myDiv">
  {{# each alarms}}
    <tr class="row100 body">
      <td class="cell100 column1">
        <!-- Class will be used to select all .btn_exp and from their events you can access the unique data -->
        <a href="#" class="btn_exp" data-alm-id="{{this.alm_id}}">
            {{ this.alm_id }}
            </a>
       </td>
      <td class="cell100 column2><a href="#">{{ this.message }}</a></td>
      <td class="cell100 column3"><a href="#">{{ this.level }}</a></td>
    </tr>
  {{/each}}
  </tbody>
</table>

有关
querySelector（）
和
queryselectoral（）
在此处签出MDN的更多信息
这正是我想要的！谢谢只是一张你写的querySelectorAll而不是querySelectorAll的便条。
<table>
  <tbody id="myDiv">
  {{# each alarms}}
    <tr class="row100 body">
      <td class="cell100 column1">
        <!-- Class will be used to select all .btn_exp and from their events you can access the unique data -->
        <a href="#" class="btn_exp" data-alm-id="{{this.alm_id}}">
            {{ this.alm_id }}
            </a>
       </td>
      <td class="cell100 column2><a href="#">{{ this.message }}</a></td>
      <td class="cell100 column3"><a href="#">{{ this.level }}</a></td>
    </tr>
  {{/each}}
  </tbody>
</table>

  var modal_exp = document.getElementById('myModal_explanatory');
  var btn_exp = document.querySelectorAll('.btn_exp'); // This returns a NodeList of the .btn_exp objects
  var span_exp = document.getElementById("close_exp");

  span_exp.onclick = function() { modal_exp.style.display = "none"; }

  btn_exp.forEach(function(button) {
    button.addEventListener('click', function(event) {
      // Through the event object you can get the unique instance of .btn_exp that you clicked
      var button = event.currentTarget

      modal_exp.style.display = "block";

      // If you wanted to get the data-alm-id value for this specific button you can access it like this
      var button_alm_id = button.dataset.almId // dashes are converted to Camel case 
      // ... Do what ever you want with this value 
    });
  });