HTML code with JS to achieve reuse

As a front-end developer, everyone will encounter a problem is repeated code how to deal with, if always copy and paste, will make the code is very large, difficult to read. While some languages, such as node. js, can be managed in a modular format, using JS or jquery can be a simple and time-consuming setup for other environments.

If there is a piece of HTML code that I need to use on multiple pages, let's implement the following:

<! Doctype html>    
In fact, the code is simple; we did a few things:
1, first save a variable A;
2, we need JS splicing out our HTML code, and assign it as a variable to A;
3, with a for loop to achieve multiple references;

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HTML code with JS to achieve reuse