如何在弹出bootstrap模式后过滤文本框值

<!-- HTML代码 -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
  弹出模态框
</button>

<!-- 模态框代码 -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h4 class="modal-title" id="myModalLabel">模态框标题</h4>
      </div>
      <div class="modal-body">
        <input type="text" id="inputText" class="form-control" placeholder="输入文本">
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
        <button type="button" class="btn btn-primary" onclick="filterText()">过滤文本</button>
      </div>
    </div>
  </div>
</div>

<script>
  function filterText() {
    // 获取文本框的值
    var inputText = document.getElementById("inputText").value;

    // 进行过滤操作，这里使用正则表达式将所有数字替换为空字符串
    var filteredText = inputText.replace(/\d/g, "");

    // 更新文本框的值
    document.getElementById("inputText").value = filteredText;
  }
</script>