windows.print() 打印

<style type="text/css" media="print">
        @page {
          size: auto;  /* 去除页眉页脚auto is the initial value */
          margin: 0mm; this affects the margin in the printer settings */
        }
        @media print {    /* 添加背景色 */
          -webkit-print-color-adjust: exact;
        }
        
    </style>

  <script type="text/javascript">
    
    function doPrint() {   
        //bdhtml=window.document.body.innerHTML;   
        //sprnstr="<!--startprint-->";   
        //eprnstr="<!--endprint-->";   
        //prnhtml=bdhtml.substr(bdhtml.indexOf(sprnstr)+17);   
        //prnhtml=prnhtml.substring(0,prnhtml.indexOf(eprnstr));
        
        document.getElementById("printBtn").style.display = "none"; // 隐藏打印按钮
        prnhtml =document.getElementById("context").innerHTML;
        window.document.body.innerHTML=prnhtml;  
        window.print();   
    }

  </script>