js打印指定DOM元素内的内容
1：js：
function printPartOfDocument() {
this.init.apply(this, arguments)
}
printPartOfDocument.prototype = {
init: function(o, part) {
this.o = this.getId(o);
this.part = this.getId(part);
this.frame = '';
this.printCss = '';
var _this = this;
this.addEvent(this.o, 'click',
function() {
_this.create()
});
},
create: function() {
var _this = this;
if (!this.frame) {
var oFrame = document.createElement('iframe');
oFrame.setAttribute('id', 'printIframe');
oFrame.style.position = 'absolute';
oFrame.style.left = '-9999px';
document.body.appendChild(oFrame);
}
if (!this.printCss) this.printCss = this.getPrintCss();
setTimeout(function() {
_this.frame = document.getElementById('printIframe'),
d = _this.frame.contentWindow.document,
h = d.getElementsByTagName('head')[0],
b = d.getElementsByTagName('body')[0];
for (var i = 0; i < _this.printCss.length; i++) {
h.appendChild(_this.printCss[i]);
}
b.innerHTML = '';
b.appendChild(_this.part.cloneNode(true));
_this.frame.contentWindow.print();
},
0);
},
getPrintCss: function() {
var styles = document.getElementsByTagName('head')[0].getElementsByTagName('link'),
printCss = [];
for (var i = 0; i < styles.length; i++) {
var attr = styles[i].getAttribute('media');
if (attr == 'all' || attr == 'print') printCss.push(styles[i].cloneNode(true));
}
return printCss;
},
getId: function(el) {
return typeof el == 'string' ? document.getElementById(el) : el
},
addEvent: function(o, type, fn) {
if (o.addEventListener) {
o.addEventListener(type, fn, false)
} else if (o.attachEvent) {
o.attachEvent('on' + type,
function() {
fn.call(o, window.event)
})
}
}
}
html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<link href="global.css" rel="stylesheet" type="text/css"/>
<link href="print.css" rel="stylesheet" type="text/css" media="print" />
<link href="print2.css" rel="stylesheet" type="text/css" media="all" />
</head>
<body>
<a href="javascript:void(0)" title="print" id="print">print</a>
<div id="print_content">
<h1>只会打印这个div里的内容，下面的层的内容不会被打印 </h1>
<p>打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，打印测试文字，</p>
</div>
<div>
<h1>这个层的内容不会被打印</h1>
<p>这里的内容不会被打印，这里的内容不会被打印，这里的内容不会被打印，这里的内容不会被打印，这里的内容不会被打印，</p>
</div>
<script type="text/javascript" src="printPartOfDocument.js"></script>
<script type="text/javascript">
new printPartOfDocument('print','print_content');
</script>
</body>
</html>
方法2:
js
function Printpart(idstr){//idstr 要打印内容中的id
var el = document.getElementById(idstr);
var iframe = document.createElement('IFRAME');
var doc = null;
iframe.setAttribute('style', 'position:absolute;width:0px;height:0px;left:-500px;top:-500px;');
document.body.appendChild(iframe);
doc = iframe.contentWindow.document;
doc.write('<div>' + el.innerHTML + '</div>');
doc.close();
iframe.contentWindow.focus();
iframe.contentWindow.print();
if (navigator.userAgent.indexOf("MSIE") > 0){
document.body.removeChild(iframe);
}
}
来自：http://www.oschina.net/code/snippet_569983_11216