原文链接：https://segmentfault.com/a/1190000006236133
利用iframe存放打印的内容，但是要注意把样式也放进iframe中，不然iframe中是没有样式的。.
代码如下：
<!DOCTYPE html>
<html lang="en" data-theme="skin0">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, maximum-scale=1, user-scalable=no">
<title>条形码</title>
<link rel="stylesheet" type="text/css" href="./css/txm.css" />
</head>
<body>
<button type="button" class="printbtn" onclick="doPrint()">打印预览</button>
<!--startprint-->
<div class="container-fluid" id="test">
<div class="row">
<div class="txmrow">
<div class="txm">
<div class="txmimg"><img src="./img/txm.png" alt=""></div>
<div class="txmtext"><span>姓名：李昌盛</span><span>性别：男</span><span>班级：七年级1班</span></div>
<div class="txmtext"><span>学校：贵阳市第二中学</span></div>
</div>
<div class="txm">
<div class="txmimg"><img src="./img/txm.png" alt=""></div>
<div class="txmtext"><span>姓名：李昌盛</span><span>性别：男</span><span>班级：七年级1班</span></div>
<div class="txmtext"><span>学校：贵阳市第二中学</span></div>
</div>
</div>
<div class="txmrow">
<div class="txm">
<div class="txmimg"><img src="./img/txm.png" alt=""></div>
<div class="txmtext"><span>姓名：李昌盛</span><span>性别：男</span><span>班级：七年级1班</span></div>
<div class="txmtext"><span>学校：贵阳市第二中学</span></div>
</div>
<div class="txm">
<div class="txmimg"><img src="./img/txm.png" alt=""></div>
<div class="txmtext"><span>姓名：李昌盛</span><span>性别：男</span><span>班级：七年级1班</span></div>
<div class="txmtext"><span>学校：贵阳市第二中学</span></div>
</div>
</div>
</div>
</div>
<!--endprint-->
<iframe id="printf" src="" width="0" height="0" frameborder="0"></iframe>
</body>
<script src="./js/jquery-1.11.1.min.js"></script>
<script>
function doPrint() {
//获取当前页的html代码
var bodyhtml = window.document.body.innerHTML;
//设置打印开始区域、结束区域
var startFlag = "<!--startprint-->";
var endFlag = "<!--endprint-->";
// 要打印的部分
var printhtml = '<link rel="stylesheet" type="text/css" href="./css/txm.css" />' + bodyhtml.substring(bodyhtml.indexOf(startFlag),
bodyhtml.indexOf(endFlag));
console.log(printhtml);
// 生成并打印ifrme
var f = document.getElementById('printf');
f.contentDocument.write(printhtml);
f.contentDocument.close();
f.contentWindow.print();
}
</script>
</html>