How to connect printer in javaScript-JS Tutorial-php.cn

Below I will share with you an example of using javaScript to link a printer and print a receipt. It has a good reference value and I hope it will be helpful to everyone.
is as follows:
<%@ page contentType="text/html;charset=UTF-8"%>
<%@ include file="/webpage/include/taglib.jsp"%>
<!-- <!DOCTYPE html> -->
<html>
<head>
<meta name="decorator" content="default" />
<script type="text/javascript" src="${ctxStatic}/jquery-ztree/3.5.12/js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="${ctxStatic}/newStyle/jsPdf.debug.js"></script>
<script type="text/javascript" src="${ctxStatic}/newStyle/html2canvas.js"></script>
<script type="text/javascript">
function doPrint(){
 
   bdhtml=window.document.body.innerHTML; 
   sprnstr="<!--startprint-->"; 
   eprnstr="<!--b-->"; 
   prnhtml=bdhtml.substr(bdhtml.indexOf(sprnstr)+17); 
   prnhtml=prnhtml.substring(0,prnhtml.indexOf(eprnstr)); 
   window.document.body.innerHTML=prnhtml; 
   window.print(); 
   top.layer.closeAll();
   
}
function closes (){
  top.layer.closeAll();
}

function downPdf(){
 document.getElementById("dayin").style.display = "none";
 document.getElementById("baocun").style.display = "none";
  html2canvas(document.body, {
   onrendered:function(canvas) {
    var contentWidth = canvas.width;
    var contentHeight = canvas.height;
    //一页pdf显示html页面生成的canvas高度;
    var pageHeight = contentWidth / 592.28 * 841.89;
    //未生成pdf的html页面高度
    var leftHeight = contentHeight;
    //pdf页面偏移
    var position = 0;
    //a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
    var imgWidth = 595.28;
    var imgHeight = 592.28/contentWidth * contentHeight;
    var pageData = canvas.toDataURL(&#39;image/jpeg&#39;, 1.0);
    var pdf = new jsPDF(&#39;&#39;, &#39;pt&#39;, &#39;a4&#39;);
    //有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)
    //当内容未超过pdf一页显示的范围，无需分页
    if (leftHeight < pageHeight) {
     pdf.addImage(pageData, &#39;JPEG&#39;, 0, 0, imgWidth, imgHeight );
    } else {
     while(leftHeight > 0) {
      pdf.addImage(pageData, &#39;JPEG&#39;, 0, position, imgWidth, imgHeight)
      leftHeight -= pageHeight;
      position -= 841.89;
      //避免添加空白页
      if(leftHeight > 0) {
       pdf.addPage();
      }
     }
    }
    pdf.save(document.getElementById("emNo").innerText+"("+document.getElementById("dt").innerText+&#39;).pdf&#39;);
   }
  })
  document.getElementById("baocun").style.display = "";
  document.getElementById("dayin").style.display = "";
}
</script>
</head>
<body >
<p style="width: 800px;height: 35px;">
 <button id="dayin" onclick="doPrint()" class="" style="border-bottom:1px solid #0071ce;float: right;background: #0071ce;color:rgb(255, 255, 255);font-size:13px;margin-right: 10px; margin-top: 10px;"><i class="fa fa-print"></i>打印</button>
 <button id="baocun" onclick="downPdf()" class="" style="border-bottom:1px solid #0071ce;float: right;background: #0071ce;color:rgb(255, 255, 255);font-size:13px;margin-right: 10px; margin-top: 10px;"><i class="fa fa-print"></i>保存</button>
</p>
<!--startprint-->
<br>
 <p id="print" style="padding-left: 15px; padding-right: 15px;">
  <table style="width: 100%">
   <tr>
    <td colspan="8" style="text-align: center;font-size: 20px;">新XXXXX物业服务中心</td>
   </tr>
   <tr >
    <td colspan="8"style="text-align: center;font-size: 14px;padding-top: 10px;">收费单据</td>
   </tr>
   <tr>
    <td colspan="2">收票类型：电费</td>
    <td colspan="3"></td>
    <td>缴费日期：</td>
    <td colspan="2" id="dt">${emfee.dt}</td>
   </tr>
   <tr>
    <td style="text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">户名</td>
    <td style="text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.userName}</td>
    <td style="text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">表号</td>
    <td id="emNo" colspan="2" style="text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.emNo}</td>
    <td style=" text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">房号</td>
    <td colspan="2" style=" text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.num}</td>
   </tr>
   <tr>
    <td style=" text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">起止时间</td>
    <td colspan="3" style=" text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.emDt}至${emfee.startDt}</td>
    <td style=" text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">缴费金额</td>
    <td style=" text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.tranMoney}</td>
    <td style="text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">倍率</td>
    <td style="text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.emRate}</td>
   </tr>
   <tr>
    <td rowspan="6" style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;">用电量</td>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">时段</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">起止表码</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">倍率前用量</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">本次用量</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">单价</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">本次电费</td>
   </tr>
   <tr>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">尖</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.mosaicJian}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.jianQuantity}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.blJian}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.jian}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.jianFee}</td>
   </tr>
   <tr>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">峰</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.mosaicFeng}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.fengQuantity}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.blFeng}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.feng}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.fengFee}</td>
   </tr>
   <tr>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">平</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.mosaicPing}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.pingQuantity}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.blPing}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.ping}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.pingFee}</td>
   </tr>
   <tr>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">谷</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.mosaicGu}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.guQuantity}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.blGu}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.gu}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.guFee}</td>
   </tr>
   <tr>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">总</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.mosaicZong}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.quantity}</td>
    <td style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">${emfee.blquantity}</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">——</td>
    <td style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;">${emfee.electFee}</td>
   </tr>
   <tr>
    <td rowspan="2" style="text-align: center;font-size: 14px;height:40px;border:1px solid #000000;">电费</td>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">上次剩余(元)</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">本期已用(元)</td>
    <td colspan="2" style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">本次缴费(元)</td>
    <td colspan="2" style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;border-bottom:0px solid #000000;">本次剩余(元)</td>
   </tr>
   <tr>
    <td style="width: 12%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;">${emfee.lastRemainQ}</td>
    <td colspan="2" style="width: 13%; text-align: center ;font-size: 14px;height: 40px;border:1px solid #000000;">${emfee.electFee}</td>
    <td colspan="2" style="width: 12%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;">${emfee.tranMoney}</td>
    <td colspan="2" style="width: 13%; text-align: center;font-size: 14px;height: 40px;border:1px solid #000000;">${emfee.remainQ}</td>
   </tr>
   <tr>
    <td colspan="2" style="text-align: center;font-size: 14px;height: 40px;"></td>
    <td style="text-align: center;font-size: 14px;height: 40px;">收款人：</td>
    <td colspan="2" style="text-align: center;font-size: 14px;height: 40px;"></td>
    <td style="text-align:center ;font-size: 14px;height: 40px;">付款人：</td>
    <td colspan="2" style="text-align:center ;font-size: 14px;height: 40px;"></td>
   </tr>
  </table>
 <!--b-->
 </p>
</body>
</html>
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The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
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