下面的代码复制了查询选择器目标的所有相关节点，复制了它们在屏幕上看到的样式，因为许多用于css选择器目标的父元素将会丢失。如果有很多带有很多样式的子节点，这将导致一些延迟。

理想情况下，你应该有一个打印样式表，但这是为用例，没有打印样式表插入，你希望打印在屏幕上看到。

如果您在此页的浏览器控制台中复制以下项目，它将打印此页上的所有代码片段。

+function() {
    /**
     * copied from  https://stackoverflow.com/questions/19784064/set-javascript-computed-style-from-one-element-to-another
     * @author Adi Darachi https://stackoverflow.com/users/2318881/adi-darachi
     */
    var copyComputedStyle = function(from,to){
        var computed_style_object = false;
        //trying to figure out which style object we need to use depense on the browser support
        //so we try until we have one
        computed_style_object = from.currentStyle || document.defaultView.getComputedStyle(from,null);

        //if the browser dose not support both methods we will return null
        if(!computed_style_object) return null;

            var stylePropertyValid = function(name,value){
                        //checking that the value is not a undefined
                return typeof value !== 'undefined' &&
                        //checking that the value is not a object
                        typeof value !== 'object' &&
                        //checking that the value is not a function
                        typeof value !== 'function' &&
                        //checking that we dosent have empty string
                        value.length > 0 &&
                        //checking that the property is not int index ( happens on some browser
                        value != parseInt(value)

            };

        //we iterating the computed style object and compy the style props and the values
        for(property in computed_style_object)
        {
            //checking if the property and value we get are valid sinse browser have different implementations
                if(stylePropertyValid(property,computed_style_object[property]))
                {
                    //applying the style property to the target element
                        to.style[property] = computed_style_object[property];

                }   
        }   

    };


    // Copy over all relevant styles to preserve styling, work the way down the children tree.
    var buildChild = function(masterList, childList) {
        for(c=0; c<masterList.length; c++) {
           var master = masterList[c];
           var child = childList[c];
           copyComputedStyle(master, child);
           if(master.children && master.children.length > 0) {
               buildChild(master.children, child.children);
           }
        }
    }

    /** select elements to print with query selector **/
    var printSelection = function(querySelector) {
        // Create an iframe to make sure everything is clean and ordered.
        var iframe = document.createElement('iframe');
        // Give it enough dimension so you can visually check when modifying.
        iframe.width = document.width;
        iframe.height = document.height;
        // Add it to the current document to be sure it has the internal objects set up.
        document.body.append(iframe);

        var nodes = document.querySelectorAll(querySelector);
        if(!nodes || nodes.length == 0) {
           console.error('Printing Faillure: Nothing to print. Please check your querySelector');
           return;
        }

        for(i=0; i < nodes.length; i++) {

            // Get the node you wish to print.
            var origNode = nodes[i];

            // Clone it and all it's children
            var node = origNode.cloneNode(true);

            // Copy the base style.
            copyComputedStyle(origNode, node);

            if(origNode.children && origNode.children.length > 0) {
                buildChild(origNode.children, node.children);
            }

            // Add the styled clone to the iframe. using contentWindow.document since it seems the be the most widely supported version.

            iframe.contentWindow.document.body.append(node);
        }
        // Print the window
        iframe.contentWindow.print();

        // Give the browser a second to gather the data then remove the iframe.
        window.setTimeout(function() {iframe.parentNode.removeChild(iframe)}, 1000);
    }
window.printSelection = printSelection;
}();
printSelection('.default.prettyprint.prettyprinted')

有点晚了，但我发现这真的很好!!

function printDiv(divID) {
    //Get the HTML of div
    var divElements = document.getElementById(divID).innerHTML;
    //Get the HTML of whole page
    var oldPage = document.body.innerHTML;

    //Reset the page's HTML with div's HTML only
    document.body.innerHTML = 
       "<html><head><title></title></head><body>" + 
              divElements + "</body>";

    //Print Page
    window.print();

    //Restore orignal HTML
    document.body.innerHTML = oldPage;
          
}

从这里https://forums.asp.net/t/1261525.aspx

<html> 
<head>
    <script language="javascript">
        function printdiv(printpage) {
            var headstr = "<html><head><title></title></head><body>";
            var footstr = "</body>";
            var newstr = document.all.item(printpage).innerHTML;
            var oldstr = document.body.innerHTML;
            document.body.innerHTML = headstr + newstr + footstr;
            window.print();
            document.body.innerHTML = oldstr;
            return false;
        }
    </script>

    <title>div print</title>

</head>

<body>
    //HTML Page //Other content you wouldn't like to print
    <input name="b_print" type="button" class="ipt" onClick="printdiv('div_print');" value=" Print ">

    <div id="div_print">
        <h1 style="Color:Red">The Div content which you want to print</h1>
    </div>
    //Other content you wouldn't like to print //Other content you wouldn't like to print
</body>    
</html>

HTML >头

  <script type="text/javascript">
    function printDiv() {
        var divToPrint = document.getElementById('printArea');  
    //Firefox was just opening a new window with same content as opener and not performing the printing dialog, so needed to make it open a new instance of the window opener    
        newWin= window.open(self.location.href);
    //We want to format the document appropriately
       newWin.document.write("\<!DOCTYPE html\>\<html lang='es'\>\<head\>\<meta charset='utf-8'\/\>\<meta name='viewport' content='width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no'><meta http-equiv='X-UA-Compatible' content='IE=edge,chrome=1'\>\<meta name='HandheldFriendly' content='true'\/\>");
    //HTML ELEMENTS THAT WE WANT TO HIDE FROM THE PRINTING AREA
        newWin.document.write("<style type='text/css'>@media print{.dataTables_info,.dataTables_filter{height:0!important;width:0!important;margin:0!important;padding:0!important;min-height:0!important;line-height:0!important;overflow:visible!important;visibility:hidden}");
    //General Styling for Printing
        newWin.document.write("body {z-index:100!important;visibility:visible!important;position:relative!important;display:block!important;background-color:lightgray!important;height:297mm!important;width:211mm!important;position:relative!important;padding:0;top:0!important;left:0!important;margin:0!important;orphans:0!important;widows:0!important;overflow:visible!important;page-break-after:always}");
    //Some forced styling in css rules includying page break for a div
        newWin.document.write("body h1{font-size:1em; font-family:Verdana;} a.marked{color:black; text-decoration:none} .pagebreak { page-break-before: always; } ");
        newWin.document.write("@page{size:A4; margin:2em; orphans:0!important;widows:0!important}}</style>\<\/head>\<body>");
        newWin.document.write(divToPrint.innerHTML);
        newWin.document.write("</body></html>");
        newWin.focus();
        newWin.print();
    }
    </script>

HTML >主体

<div id="printArea">

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
<!-- Page break -->
<div class="pagebreak">&nbsp;</div>

It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like).
</div>

我认为有更好的解决办法。让你的div打印覆盖整个文档，但只在打印时:

@media print {
    .myDivToPrint {
        background-color: white;
        height: 100%;
        width: 100%;
        position: fixed;
        top: 0;
        left: 0;
        margin: 0;
        padding: 15px;
        font-size: 14px;
        line-height: 18px;
    }
}

公认的解决方案不起作用。Chrome打印了一个空白页面，因为它没有及时加载图像。这种方法是有效的:

编辑:看来接受的解决方案在我发布后被修改了。为什么会投反对票?这个解决方案也同样有效。

    function printDiv(divName) {

        var printContents = document.getElementById(divName).innerHTML;
        w = window.open();

        w.document.write(printContents);
        w.document.write('<scr' + 'ipt type="text/javascript">' + 'window.onload = function() { window.print(); window.close(); };' + '</sc' + 'ript>');

        w.document.close(); // necessary for IE >= 10
        w.focus(); // necessary for IE >= 10

        return true;
    }