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js implementation of partial page print preview principle and sample code_javascript skills

WBOY
WBOYOriginal
2016-05-16 16:42:382159browse

Recently, a friend asked how to print preview in js. Today I will explain it. First, let’s understand the printing principle. In fact, partial printing of the page is very simple. Just make a starting mark for the part you want to print. As for how to write the mark, you can write whatever you want. I will write here deb9743a1dda5b69a1ef24bbfc365042 the content that needs to be printed

c474806c1b49f890ebb5bd06e2d26ef3. Because the markup does not need to be seen by users, I added a comment! The specific implementation code is as follows: 

<!DOCTYPE html> 
<html> 
<head> 
<title>打印预览简单实现</title> 
</head> 
<body> 
<div> 
这是body 里的内容不需要打印，具体的页面设计根据自己的要求自行设计。如果需要一个页面多个tag,可以动态生成tag 
</div> 
<!--startprint--> 
<div> 
这是我需要打印的内容 
</div> 
<!--endprint--> 
<script type="text/javascript"> 
function preview() 
{ 
var bdhtml=window.document.body.innerHTML;//获取当前页的html代码 
var startStr="<!--startprint-->";//设置打印开始区域 
var endStr="<!--endprint-->";//设置打印结束区域 
var printHtml=bdhtml.substring(bdhtml.indexOf(startStr)+startStr.length,bdhtml.indexOf(endStr));//从标记里获取需要打印的页面 

window.document.body.innerHTML=printHtml;//需要打印的页面 
window.print(); 
window.document.body.innerHTML=bdhtml;//还原界面 
} 
preview(); 
</script> 
</body> 
</html>
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