知识点：

requests
execjs

第三方库：

requests >>> pip install requests
execjs >>> pip install PyExecJS

开发环境：

版本：anaconda5.2.0（python3.6.5）
编辑器：pycharm

分析，单首歌曲所在的链接、加密的规则

选定目标

先点击动态加载，然后在点击播放按钮

先使用检索工具，复制歌曲ID，在检索工具里搜索，最后找到歌曲的数据包

在这里插入图片描述

找到加密之后的数据，复制encSecKey到检索工具里查找

找到数据包后，右键点击Open in Sources panel

分析数据，复制代码

运行后得到加密参数

开始写代码

第一个解密

import requests  # 发送网络请求
import execjs  # 调用js代码的模块

    url = 'https://music.163.com/weapi/song/enhance/player/url/v1?csrf_token=f3cb47b2b44afb5c7d5b267cc60766cb'
    js = open('demo.js', 'r', encoding='utf-8').read()
    ctx = execjs.compile(js)
    # 调用js里面的函数 (第一个是函数名, 参数)
    result = ctx.call('start', song_id)
    data = {
        'params': result['encText'],
        'encSecKey': result['encSecKey']
    }
    headers = {
        'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
        # 用户信息标识
        'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
    }

第二个解密

js = open('demo.js', 'r', encoding='utf-8').read()
ctx = execjs.compile(js)
# 调用js里面的函数 (第一个是函数名, 参数)
result = ctx.call('main', input('请输入你想要下载的歌曲名称/歌手名称:'))
data = {
    'params': result['encText'],
    'encSecKey': result['encSecKey']
}
headers = {
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
    # 用户信息标识
    'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
}
url = 'https://music.163.com/weapi/cloudsearch/get/web?csrf_token='

提取数据

songs = requests.post(url, data=data, headers=headers).json()['result']['songs']
for song in songs:
    song_name = song['name']    # 歌曲名称
    song_id = song['id']        # 歌曲id
    singer_name = song['ar'][0]['name'] # 歌手名称

拿到每一首歌的url地址

mp3_url = requests.post(url, data=data, headers=headers).json()['data'][0]['url']

依次请求歌曲 url

# 音频 图片 视频  二进制数据
mp3_data = requests.get(mp3_url, headers=headers).content

保存数据

with open(f'mp3/{song_name}-{singer_name}.mp3', mode='wb') as f:
    f.write(mp3_data)
print(f'{song_name}-{singer_name}爬取成功!!!')

完整代码

import requests  # 发送网络请求
import execjs  # 调用js代码的模块


js = open('demo.js', 'r', encoding='utf-8').read()
ctx = execjs.compile(js)
# 调用js里面的函数 (第一个是函数名, 参数)
result = ctx.call('main', input('请输入你想要下载的歌曲名称/歌手名称:'))
data = {
    'params': result['encText'],
    'encSecKey': result['encSecKey']
}
headers = {
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
    # 用户信息标识
    'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
}
url = 'https://music.163.com/weapi/cloudsearch/get/web?csrf_token='
songs = requests.post(url, data=data, headers=headers).json()['result']['songs']
for song in songs:
    song_name = song['name']    # 歌曲名称
    song_id = song['id']        # 歌曲id
    singer_name = song['ar'][0]['name'] # 歌手名称

    url = 'https://music.163.com/weapi/song/enhance/player/url/v1?csrf_token=f3cb47b2b44afb5c7d5b267cc60766cb'
    js = open('demo.js', 'r', encoding='utf-8').read()
    ctx = execjs.compile(js)
    # 调用js里面的函数 (第一个是函数名, 参数)
    result = ctx.call('start', song_id)
    data = {
        'params': result['encText'],
        'encSecKey': result['encSecKey']
    }
    headers = {
        'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
        # 用户信息标识
        'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
    }
    # 如果你买了这首歌 有这首歌的权限 那么就可以下载
    # 拿到每一首歌的url地址
    mp3_url = requests.post(url, data=data, headers=headers).json()['data'][0]['url']
    # 依次请求 歌曲 url
    # .content: 拿到网页当中的 二进制数据
    # 音频 图片 视频  二进制数据
    mp3_data = requests.get(mp3_url, headers=headers).content
    # 保存
    with open(f'mp3/{song_name}-{singer_name}.mp3', mode='wb') as f:
        f.write(mp3_data)
    print(f'{song_name}-{singer_name}爬取成功!!!')