更改打印或打印预览的 widows 属性 - 在线编辑器

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function ChangeWidows() {
      document.getElementById("p1").style.widows = document.getElementById("widows").value;
    }
  </script>
  <style>
    .othercontent {
      width: 400px;
      border-top: 19cm solid #c3c3c3;
    }

    @page {
      /* 设置打印页面大小 */
      size: 21cm 27cm;
      margin-top: 2cm;
    }

    @media print {
      .widows {
        widows: 2;
      }
    }
  </style>
</head>
<body>

  <div class="othercontent">
    <input id="widows" value="2" />
    <button onclick="ChangeWidows();">修改窗口</button>
    <p style="font-size:120%" id="p1">
      修改窗口并且查看打印预览<br> Line 2<br> Line 3<br> Line 4<br> Line 5<br> Line 6<br> Line 7<br> Line 8<br>
    </p>
    <div class="othercontent"></div>
  </div>

</body>
</html>
​x
 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function ChangeWidows() {
      document.getElementById("p1").style.widows = document.getElementById("widows").value;
    }
  </script>
  <style>
    .othercontent {
      width: 400px;
      border-top: 19cm solid #c3c3c3;
    }
​
    @page {
      /* 设置打印页面大小 */
      size: 21cm 27cm;
      margin-top: 2cm;
    }
​
    @media print {
      .widows {
        widows: 2;
      }
    }
  </style>
</head>
<body>
​
  <div class="othercontent">
    <input id="widows" value="2" />
    <button onclick="ChangeWidows();">修改窗口</button>
    <p style="font-size:120%" id="p1">
      修改窗口并且查看打印预览<br> Line 2<br> Line 3<br> Line 4<br> Line 5<br> Line 6<br> Line 7<br> Line 8<br>
    </p>
    <div class="othercontent"></div>
  </div>
​
</body>
</html>