html加如下代码

<div style="display:none"> 
<div id="to_print"></div> 
<input type="button" id="print_button" value="Print" onclick="document.getElementById('FILEtoPrint').focus(); document.getElementById('FILEtoPrint').contentWindow.print();" /> 
</div> 

<script> 
function printSome(path){ //传入文件路径 
$("#to_print").html('<iframe src='+path+' id="FILEtoPrint"></iframe>'); 
setTimeout(function(){$("#print_button").click();}, 500); 
} 
</script>

web界面添加按钮调用js即可