JS实现页面部分内容打印

原理：在页面内嵌入一个隐藏的iframe，把要打印的内容赋值给iframe，再利用iframe的print()方法，实现打印。

主页面代码

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JS实现页面部分内容打印</title>
<style>
button {
	display: block;
	padding: 2px 20px 4px 20px;
}
.ifr1 {
	width:530px;
	height:120px;
	display:none;
}
.div1, .div2 {
	width:300px;
	line-height:100px;
	border:1px solid #000;
	margin-bottom:20px;
	text-align:center;
}
</style>
<script type="text/javascript">
function myPrint() {
	var iwindow = window.frames['ifr1'];
	var idoc = iwindow.document;
	idoc.getElementById("myDiv").innerHTML = document.getElementById("div2").innerHTML;
	iwindow.print();
}
</script>
</head>
<body>
	<div id="div1"><div class="div1">This is div1</div></div>
	<div id="div2"><div class="div2">This is div2</div></div>
	<button onclick="myPrint()">打印Div2</button>
	<iframe name="ifr1" src="iframe.html" class="ifr1"></iframe>
</body>
</html>

<!DOCTYPE html>

<html>

<head>

<title>JS实现页面部分内容打印</title>

<style>

button {

display: block;

padding: 2px 20px 4px 20px;

}

.ifr1 {

width:530px;

height:120px;

display:none;

}

.div1, .div2 {

width:300px;

line-height:100px;

border:1px solid #000;

margin-bottom:20px;

text-align:center;

}

</style>

function myPrint() {

var iwindow = window.frames['ifr1'];

var idoc = iwindow.document;

idoc.getElementById("myDiv").innerHTML = document.getElementById("div2").innerHTML;

iwindow.print();

}

</script>

</head>

<body>

<button onclick="myPrint()">打印Div2</button>

</body>

</html>

iframe.html页面代码

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>iframe页面</title>
<style>
body {
	padding:0;
	margin:0 auto;
}
#myDiv {
	text-align:center;
}
.div2 {
	margin: 0 auto;
	width:500px;
	line-height:50px;
	font-size:24px;
	font-weight:bold;
	text-align:center;
	margin-top:10px;
	border:1px solid #ff0000;
}
</style>
</head>
<body>
	<div id="myDiv">This is iframe</div>
</body>
</html>

<!DOCTYPE html>

<html>

<head>

<title>iframe页面</title>

<style>

body {

padding:0;

margin:0 auto;

}

#myDiv {

text-align:center;

}

.div2 {

margin: 0 auto;

width:500px;

line-height:50px;

font-size:24px;

font-weight:bold;

text-align:center;

margin-top:10px;

border:1px solid #ff0000;

}

</style>

</head>

<body>

<div id="myDiv">This is iframe</div>

</body>

</html>

说明：在iframe.html页面，对样式div2重新进行了设定。

JS实现页面部分内容打印

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