Administrative division code acquisition

stay gis The development of , Administrative division data is often used , According to the national compilation , Each administrative division has a code , How to get the corresponding data , The National Bureau of statistics updates all provinces and cities in the country every year 、 District and county 、 Township information and code , The way to provide is html Web form , You can use code to crawl information .
Website of administrative divisions of the National Bureau of Statistics （ Calendar year ）：
http://www.stats.gov.cn/tjsj/tjbz/tjyqhdmhcxhfdm/

Crawling way
First of all, analyze the webpage of administrative division information , Use chrome Or other browser developer tools , Check the source code of the web page , Provincial Information , There are links to web pages with names and subordinate administrative divisions , Here's the picture ：

Municipal Information , It is also the name and administrative division code , Here's the picture ：

Same principle , You can check districts and counties 、 Township 、 The name and link address of the community village .
Crawl use class library （nodejs）
Use nodejs When crawling the administrative division web page information , Use the following key class libraries ：
axios Front end class library used to request web pages , Crawl the web information down ;
iconv-lite The page code is gb2312, Direct use axios Return string , There will be garbled code , It needs to be changed ;
cheerio Webpage dom Operation class library ,cheerio yes jquery A fast, flexible and concise implementation of core functions

Use axios according to url, With arraybuffer Request the web page in the form of , Use icon-lite With gb2312 Encoding for string conversion , Use cheerio Convert strings dom Form to operate .