How to implement printing in JS (detailed answer combined with code)-JS Tutorial-php.cn

The following is how I compiled for you how to implement printing in JS. Interested students can take a look.

1. How JS implements printing

Method 1: window.print()

window.print(); A print dialog box will pop up, printing the content in window.document.body.innerHTML , the following is an example of partial printing taken from the Internet. The disadvantage of this example is that printing will modify the content of the page.

<!DOCTYPE html>  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>局部打印案例</title>  
<script type="text/javascript">     
    function doPrint() {      
        bdhtml=window.document.body.innerHTML;      
        sprnstr="<!--startprint-->";      
        eprnstr="<!--endprint-->";      
        prnhtml=bdhtml.substr(bdhtml.indexOf(sprnstr)+17);      
        prnhtml=prnhtml.substring(0,prnhtml.indexOf(eprnstr));      
        window.document.body.innerHTML=prnhtml;   
        window.print();      
}      
</script>  
</head>  
<body>  
<p>1不需要打印的地方</p>  
<p>2这里不要打印啊</p>  
<!--startprint--><!--注意要加上html里star和end的这两个标记-->  
<h1>打印标题</h1>  
<p>打印内容~~</p>  
<!--endprint-->  
<button type="button" onclick="doPrint()">打印</button>  
<p>不打印的地方啊哈哈哈哈</p>  
<p>2</p>  
</body>  
</html>  
[javascript] view plain copy
<!DOCTYPE html>  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>局部打印案例</title>  
<script type="text/javascript">     
    function doPrint() {      
        bdhtml=window.document.body.innerHTML;      
        sprnstr="<!--startprint-->";      
        eprnstr="<!--endprint-->";      
        prnhtml=bdhtml.substr(bdhtml.indexOf(sprnstr)+17);      
        prnhtml=prnhtml.substring(0,prnhtml.indexOf(eprnstr));      
        window.document.body.innerHTML=prnhtml;   
        window.print();      
}      
</script>  
</head>  
<body>  
<p>1不需要打印的地方</p>  
<p>2这里不要打印啊</p>  
<!--startprint--><!--注意要加上html里star和end的这两个标记-->  
<h1>打印标题</h1>  
<p>打印内容~~</p>  
<!--endprint-->  
<button type="button" onclick="doPrint()">打印</button>  
<p>不打印的地方啊哈哈哈哈</p>  
<p>2</p>  
</body>  
</html>

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Method 2: Use the html tag