爬取https://max.book118.com網站的某一本書，其實也算不上爬取，只是下載。我這個只是拋磚引玉，大神們可以寫個網站整個文件的爬蟲。

以這本書為列 https://max.book118.com/html/2017/0802/125615287.shtm，再加上批量img2pdf的方法，就可以下載一本書了。具體的分析過程不在此贅述，直接上程式碼（程式碼只是用於本人學習，寫的有些low）

import requests
import os
import json
def savePng(url, fileName):
    root = "//home//Desktop//
 
"
    path = root + "//" +  fileName
    if not os.path.exists(root):
        os.mkdir(root)
    if not os.path.exists(path):
        r = requests.get(url)
        r.raise_for_status()
    with open(path, "wb+") as f:
        f.write(r.content)  
def getPNGName(url):
    req = requests.get(url)
    json_req 
 
= req.content.decode()
    json_dict= json.loads(json_req)
    print(json_dict)
    return json_dict["NextPage"] 
def getNextPageURL(pngName):
    url = "https://view42.book118.com/pdf/GetNextPage/?f=dXAyMjI2LTIuYm9vazExOC5jb20uODBcMzQ4NDU0MS01OTgxMGI5MDMwM2JjLnBkZg==&img=%s&isMobile=false&isNet=True&readLimit=kVJSwRWfuu2BpuMVDJqlnw==&
 
[email protected][email protected][email protected]==" % pngName
    return url
def getCurPageUrl(pngName):
    url = "https://view42.book118.com/img/?img=%s" % pngName
    return url 
 
#url = getNextPageURL("[email protected]cA4m4rqRBGs=")
url = "https://view42.book118.com/pdf/GetNextPage/?f=dXAyMjI2LTIuYm9vazExOC5jb20uODBcMzQ4NDU0MS01OTgxMGI5MDMwM2JjLnBkZg==&[email protected]WAYh&isMobile=false&isNet=True&readLimit=kVJSwRWfuu2BpuMVDJqlnw==&[email protected][email protected][email protected]=="   
for curPageIndex in range(0, 486):
    #根據當前圖片名字，請求下一張圖片名字
    pngName = getPNGName(url)
    #根據下一張圖片名字拼湊url
    url = getCurPageUrl(pngName)
    #下載PNG，記錄圖片名字
    savePng(url, str(curPageIndex) + ".PNG")
    #得到下一頁圖片url
    url = getNextPageURL(pngName)