div>
            <div class="card-footer">
              <button type="submit" class="btn btn-primary" onclick="doSelect()">查询</button>
            </div>
          </form>
        </div>
        <div class="card">
          <div class="card-header">
            <h3 class="card-title">用户数据</h3>
          </div>
          <div class="card-body">
            <table class="table table-bordered">
              <thead>
              <tr>
                <th>序号</th>
                <th>用户名</