Introducing several common methods of js DOM
Get element nodes getElementById getElementsByTagName getElementsByClassName
First write a simple web page for testing:
/* test.html */ <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>test</title> </head> <body> <p id="contentId" style="width:500px; height: 30px;background-color: #ccc">这段的id是contentId。</p> <p class="contentClass" style="width:500px; height: 30px;background-color: #ccc">这段的class name是contentClass。</p> </body> </html>
1. getElementById
1. First define the variable var contentId = document.getElementById("contentId");
2. Then output the object contentId and return the element object with the id contentId (
). See the picture below:
2. getElementsByTagName
1. Define the variable first var contentTag = document.getElementsByTagName("p");
2. Then I output the contentTag, which returns two HTMLCollection [
,
3. Continue contentTag[0] Output
contentTag[ 1] Output
##After changing the style attribute:
5. Then this is childNOdes:
##That is to say,
When encountering block elements, there will be There is a newline character, and the browser will treat it as a text node when looking for child nodes. It can also be seen from the figure that childNodes also returns an array.
What if it is ?
There are 12 types of nodeType values, and there are three commonly used ones: 1 represents element node, 2 represents attribute node, and 3 represents text node. 
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mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
