layui打印html页面转成pdf

<!DOCTYPE html>
<html lang="zh">
<head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <meta http-equiv="X-UA-Compatible" content="ie=edge" />
        <title>Document</title>
        <link rel="stylesheet" type="text/css" href="lib/layui/css/layui.css"/>
        <script src="lib/layui/layui.js" type="text/javascript" charset="utf-8"></script>
                <script language="javascript">
    function preview(oper)
    {
        if (oper < 10){
            bdhtml=window.document.body.innerHTML;//获取当前页的html代码
            sprnstr="<!--startprint"+oper+"-->";//设置打印开始区域
            eprnstr="<!--endprint"+oper+"-->";//设置打印结束区域
            prnhtml=bdhtml.substring(bdhtml.indexOf(sprnstr)+18); //从开始代码向后取html
            prnhtml=prnhtml.substring(0,prnhtml.indexOf(eprnstr));//从结束代码向前取html
            window.document.body.innerHTML=prnhtml;
            window.print();
            window.document.body.innerHTML=bdhtml;
        } else {
            window.print();
        }
    }
</script>
            <!--打印-->
</head>
<body>
    <style type="text/css">
            .layui-tab-item{
                margin-top: 100px;
            }
            .layui-this{
                    background-color: orange;
            }
        </style>
    <div class="layui-tab">
      <ul class="layui-tab-title">
        <li class="layui-this">
            <table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄1</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table>
        </li>
        <!--标签1-->
        <li>
        <table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄2</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table>
        </li>
         <!--标签2-->
        <li>
        <table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄2</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table>
        </li>
        <!--标签3-->
        <li>
        <table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄2</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table>
        </li>
       <li>
           <!--标签4-->
        <table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄2</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table>
        </li>
        <!--标签5-->
      </ul>
      <!--startprint1-->
    <!--打印内容开始-->
      <div class="layui-tab-content">
        <div class="layui-tab-item layui-show">
            <table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄1</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table>
        </div>
        <!--对应1-->
        <div class="layui-tab-item"><table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄2</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table></div>
        <!--对应2-->
           <div class="layui-tab-item"><table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄3</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table></div>
        <!--对应3-->
            <div class="layui-tab-item"><table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄4</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table></div>
        <!--对应4-->
            <div class="layui-tab-item"><table border="1" align="center" id="informationtable">
            <tr>
                <th>年龄5</th>
                <th>身高</th>
                <th>体重</th>
                <th>疾病史</th>
            </tr>
            <tr>
                <td>61岁    </td>
                <td>161cm</td>
                <td>61kg</td>
                <td>高血压、糖尿病</td>
            </tr>
        </table></div>
        <!--对应5-->
      </div>
      <!--打印内容结束-->
    <!--endprint1-->

</div>
<div class="layui-inline" title="打印"  onclick=preview(1) ><i class="layui-icon layui-icon-face-smile" style="font-size: 30px; color: #1E9FFF;"></i></div>
<!--     <input type=button name='button_export' title='打印' onclick=preview(1) value=打印1>-->

<script>
    layui.use('element', function(){
        var element = layui.element;
    });
</script>
</body>
</html>