前端代碼如下：<tr class="even">    <td>706201</td>     <td>09-27 15:42</td>     <td class="nums">                     <i class="pk-no2">2</i>                 <i class="pk-no6">6</i>                 <i class="pk-no1">1</i>                 <i class="pk-no9">9</i>                 <i class="pk-no7">7</i>                 <i class="pk-no4">4</i>                 <i class="pk-no3">3</i>                 <i class="pk-no5">5</i>                 <i class="pk-no8">8</i>                 <i class="pk-no10">10</i>             </td>我想用python模擬瀏覽器來抓取706201這個數據和class的值中的數字，我的代碼如下：lines = browser.find_element_by_class_name('class').text但是沒有輸出，請問是什么原因