这是因为您没有遵循响应表.您必须将table元素与.table类一起包装在具有.table-responsive类的包装器<div>中，如下所示:

It's because you are not following the Bootstrap documentation indications on responsive tables. You have to wrap your table element with .table class in a wrapper <div> with the .table-responsive class, like this:

<div class="table-responsive">
  <table class="table">
    ...
  </table>
</div>