爬蟲實戰 -- QQ音樂爬取全部歌曲
2020-09-29 14:00:50
前景介紹
最近小夥伴們聽歌的興趣大漲，網抑雲綜合症已經遍佈各地。
咱們再來擡高一波QQ音樂的熱度吧。
土豪充綠鑽 和 刷永久綠鑽的除外(me🤣)
爬它！
目標：歌手列表
任務：將A到Z的歌手以及全部頁數的歌存到本地和資料庫
觀察網頁url結構
當我們進入網頁時發現此時是一個無引數的html網頁載入。
尋找我們想要拿到的位置尋找變化，但我們點選A開頭的網頁跳轉時，發現 url 改變了，index 引數應該是首字母，page 引數應該是頁數變化。
這樣的話就減少一個找引數的時間啦。
找到XML
還是習慣的點開檢查按鍵，找到首字母的作者提供的XML都需要什麼引數，隨便點點A-Z發現 XML 有一個請求蹦出來，裡面返回了是個 json 資料集，都點開看看發現找到了每個作者的引數了。成功了一小半！
既然拿到了XML的網站，POST請求是一定的啦，接下來就該分析分析網站所需要的引數都是什麼了，大致猜測一下，這麼多資料中sign和data引數有點詭異，不像是正常的引數，加密引數也找到了。
破解sign加密引數
search 找一下sign都在哪裡。因為sign應該是個變數，所以說在他後面加個=會查詢的更精確一些。找到一個sign引數的位置，這應該是個JavaScript程式碼，那就應該是這裡面了。點進去！
在JavaScript中找到了 sign 的位置，找到了一個JavaScript呼叫的網站，我們進去看看是什麼程式碼在裡面。
當我們進入網站之後，程式碼有點亂我們線上格式化一下看看裡面是什麼。
格式化程式碼後發現這個裡面含有sign引數。這個應該是sign的加密演演算法，但是其中傳了一個引數進入，我們需要了解一下他傳了什麼引數，這樣我們的sign就出來了。
回到我們呼叫JavaScript網站的檔案中，繼續往下看，我們發現 sign 傳數值就在他的下部。我們看到了傳了個data給這個sign加密函數，點斷點看看data引數是什麼。這data值看的好眼熟，這不是一開始很奇怪那個引數data麼。原來data弄出來了sign就能給出來的。
我們繼續找剛才的sign。點選下一次跳轉我們發現我們找到另一個函數在裡面，產生了一種疑惑，這個函數是做什麼的，他為什麼會跳向這裡。
那我們先看看我們格式化出來的JavaScript到底能不能執行吧。說不定能執行呢。
哦吼，能執行，那就好辦了，看看他返回的引數到底是啥，在開頭定義一個sign=null，將t返回給sign，再把sign列印出來。這是剛才的那個跳轉過去的方法。
原來如此，那我們將sign呼叫一下加個()，我們就能發現sign的值就出現了。但我們重複執行發現我們無法得到他的加密值，因為這些都是一樣的。
回想我們剛才說的話，他需要加一個data引數才可以獲得加密引數，那好再改一下。
首先我們先下載一個python呼叫JavaScript的庫。pip install PyExecJS
開始寫python程式碼
import execjs
def get_sign(data):
with open('a.js','r',encoding='utf-8') as f:
text = f.read()
js_data = execjs.compile(text)
sign = js_data.call('get_sign',data)
return sign
if __name__ == "__main__":
data = '{"comm":{"ct":24,"cv":0},"singerList":{"module":"Music.SingerListServer","method":"get_singer_list","param":{"area":-100,"sex":-100,"genre":-100,"index":2,"sin":0,"cur_page":1}}}'
sign = get_sign(data)
print(data)
print(sign)
這是多次呼叫程式碼的結果，發現data傳入成功了。
獲取歌手個數以及頁數
個數其實一開始我們已經拿到了，只不過那時候沒介紹，仔細的童鞋們應該是看到了總數到底為多少個。我們點開剛才的返回json結果就能看到total已經給出來當前的個數了。
現在該分析一下data引數，盲猜一通估計page和index都在data裡面，要不然這個引數傳不上去呀。好的分析一下data到底有啥，咱拿過來看看。data裡面看到了get_singer_list這個應該是主要的東西。
# 這個是 A開頭 第一頁
#{"comm":{"ct":24,"cv":0},"singerList":{"module":"Music.SingerListServer","method":"get_singer_list","param":{"area":-100,"sex":-100,"genre":-100,"index":1,"sin":0,"cur_page":1}}}
# 這個是 B開頭 第一頁
#{"comm":{"ct":24,"cv":0},"singerList":{"module":"Music.SingerListServer","method":"get_singer_list","param":{"area":-100,"sex":-100,"genre":-100,"index":2,"sin":0,"cur_page":1}}}
# 這個是 B開頭 第二頁
#{"comm":{"ct":24,"cv":0},"singerList":{"module":"Music.SingerListServer","method":"get_singer_list","param":{"area":-100,"sex":-100,"genre":-100,"index":2,"sin":80,"cur_page":2}}}
# 這個是 B開頭 第三頁
#{"comm":{"ct":24,"cv":0},"singerList":{"module":"Music.SingerListServer","method":"get_singer_list","param":{"area":-100,"sex":-100,"genre":-100,"index":2,"sin":160,"cur_page":3}}}
大致我們能分析出來。
- 字母的變化在 index 處，也就是A到Z以及後面的# 應該是一共27個在裡面，也就是index從1到27我們需要傳給他。
- 頁數的變化在 sin 這裡，第一頁是0，第二頁就是80，第三頁是160，冷靜分析一下應該是從0開始以80為公差的等差數列。這個八十應該是代表每一頁都含有八十個歌手。
- cur_page應該就是當前頁數的意思。那咱們跟著sin一起改變。
那在這我們拿到了總數，加上每一頁總共能展示多少，因為多出來的個數需要佔一頁才可以，我們使用向下取整。
獲取作者名字以及id號
我們根據上述寫出來爬蟲程式碼後，就可以成功獲取 json 的返回值了，在裡面我們能看到一個歌手的引數一共有五個，其中 singer_mid 和 singer_name 是我們所需要的。拿到這兩個值後可以進入網站下載當前歌手的歌曲。
尋找歌手的歌曲
我們隨意點進去一個歌手，進去後尋找XML的網站，我在這裡找好了是 getSingerSong 變數。
在這裡能獲取歌手的每首歌的所能拿到的結果。
我們看一下里面都需要什麼引數，好像和上次的差不多哦。sign已經獲取到了，data是給定的變數。單純的data有點變化，但問題不大。那說明還是能正常存取這個XML的。
data中有點變化的位置就是 singerMid ，這個引數我們在剛才已經獲取到了。直接在裡面參照一下就好了。begin的引數是一個歌手歌的頁數，num是一頁中包括多少歌曲。其實我們傳引數可以將這個引數改一下的。把num的值改到一個很大的值，我們就可以不需要改變begin的引數就能拿到所有的歌曲結果。
我們仔細找一下 json 裡面的引數，點選音樂連結進入發現是https://y.qq.com/n/yqq/song/002MQlds19S8qy.html，我們能發現，在這個歌曲裡面的 mid 引數就是每首歌的格式化位置。
尋找下載歌曲的m4a連結
我們點入播放中。尋找裡面的m4a連結看看都包含什麼引數，發現存在七個連結都是。但我們仔細一看歌曲的大小我們就會發現，前幾個都是有問題的發包，一首歌怎麼可能只有幾kb呢。毫不猶豫點進去最後一個。
哦吼，這回引數不一樣了哦。那我們在重新分析一下下吧別懶了。
我們先查詢一下他給出來的一些包，看看能不能找到一個非加密引數出來。
果然，功夫不負有心人。vkey 就不是個加密引數！
破解引數前先學會"投機取巧"
我不知道剛才有沒有仔細看這個位置，發現這個也是個很長的字串，但是他很特殊，特殊到它和m4a的url是一樣的。
為了讓你們看到，我在這裡把這倆寫出來，發現到他們差了什麼。不變的字串字首。。
# C400002wiewH40saXM.m4a?guid=9232644380&vkey=A6F8B706468C0ECFE0F8B6E5E8AAD783D5F852ED0CA66692EB1033B209080BE61208609BEBC2EAF66FA86AC887C8C9F03C02A152E2EF4E24&uin=0&fromtag=66
# https://isure.stream.qqmusic.qq.com/C400002wiewH40saXM.m4a?guid=9232644380&vkey=A6F8B706468C0ECFE0F8B6E5E8AAD783D5F852ED0CA66692EB1033B209080BE61208609BEBC2EAF66FA86AC887C8C9F03C02A152E2EF4E24&uin=0&fromtag=66
那我們先看看vkey到底需要什麼引數給進去。其他引數還是都那些，還是差了一個data需要給進去的。咱們分析一下data都需要給啥吧。
# {"req":{"module":"CDN.SrfCdnDispatchServer","method":"GetCdnDispatch","param":{"guid":"9232644380","calltype":0,"userip":""}},"req_0":{"module":"vkey.GetVkeyServer","method":"CgiGetVkey","param":{"guid":"9232644380","songmid":["002MQlds19S8qy"],"songtype":[0],"uin":"0","loginflag":1,"platform":"20"}},"comm":{"uin":0,"format":"json","ct":24,"cv":0}}
大致分析了一下
- guid是個無用引數。
- songmid 是歌曲的 mid，我們剛才已經獲取了
- uin 需要加入一個qq號才可以獲取，如果未登陸預設為0
- 其他都是定死的引數
m4a檔案是一個二進位制檔案。所以說我們寫程式碼一定要寫入二進位制檔案才可以。
程式碼優化
- 因為資料量過大，日常存入資料庫
- 因為資料下載量大，使用多程序爬取。將A-Z及#各開一個程序
- 防止存入資料庫在多執行緒階段同時佔用，上鎖
全部程式碼
crawl.py
#Python3.7
#encoding = utf-8
import execjs,requests,math,os,threading
from urllib import parse
from concurrent.futures import ThreadPoolExecutor,ProcessPoolExecutor
from db import SQLsession,Song
lock = threading.Lock()
headers = {
'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36',
'Referer':'https://y.qq.com/portal/singer_list.html',
}
session = SQLsession()
def get_sign(data):
with open('./QQ音樂/get_sign.js','r',encoding='utf-8') as f:
text = f.read()
js_data = execjs.compile(text)
sign = js_data.call('get_sign',data)
return sign
def myProcess():
#把歌手按照首字母分為27類
with ProcessPoolExecutor(max_workers = 2) as p:#建立27個程序
for i in range(1,28):
p.submit(get_singer_mid,i)
def get_singer_mid(index):
#index = 1-----27
#開啟歌手列表頁面，找出singerList,找出所有歌手的數目,除於80,構造後續頁面獲取page歌手
#找出mid, 用於歌手詳情頁
data = '{"comm":{"ct":24,"cv":0},"singerList":'\
'{"module":"Music.SingerListServer","method":"get_singer_list","param":'\
'{"area":-100,"sex":-100,"genre":-100,"index":%s,"sin":0,"cur_page":1}}}'%(str(index))
sign = get_sign(data)
url = 'https://u.y.qq.com/cgi-bin/musics.fcg?-=getUCGI6720748185279282&g_tk=5381'\
'&sign={}'\
'&loginUin=0&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8'\
'¬ice=0&platform=yqq.json&needNewCode=0'\
'&data={}'.format(sign,parse.quote(data))
html = requests.get(url,headers = headers).json()
total = html['singerList']['data']['total']#多少個歌手
pages = int(math.floor(int(total)/80))#向下取整
thread_number = pages
Thread = ThreadPoolExecutor(max_workers = thread_number)
sin = 0
#分頁迭代每一個字母下的所有頁面歌手
for page in range(1,pages+2):
data = '{"comm":{"ct":24,"cv":0},"singerList":{"module":"Music.SingerListServer","method":"get_singer_list","param":{"area":-100,"sex":-100,"genre":-100,"index":%s,"sin":%s,"cur_page":%s}}}'%(str(index),str(sin),str(page))
sign = get_sign(data)
url = 'https://u.y.qq.com/cgi-bin/musics.fcg?-=getUCGI6720748185279282&g_tk=5381'\
'&sign={}'\
'&loginUin=0&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8'\
'¬ice=0&platform=yqq.json&needNewCode=0'\
'&data={}'.format(sign,parse.quote(data))
html = requests.get(url,headers = headers).json()
sings = html['singerList']['data']['singerlist']
for sing in sings:
singer_name = sing['singer_name'] #獲取歌手名字
mid = sing['singer_mid'] #獲取歌手mid
Thread.submit(get_singer_data,mid = mid,
singer_name = singer_name,)
sin+=80
#獲取歌手資訊
def get_singer_data(mid,singer_name):
#獲取歌手mid,進入歌手詳情頁，也就是每一個歌手歌曲所在頁面
#找出歌手的歌曲資訊頁
data = '{"comm":{"ct":24,"cv":0},"singerSongList":{"method":"GetSingerSongList","param":'\
'{"order":1,"singerMid":"%s","begin":0,"num":10}'\
',"module":"musichall.song_list_server"}}'%(str(mid))
sign = get_sign(data)
url = 'https://u.y.qq.com/cgi-bin/musics.fcg?-=getSingerSong4707786209273719'\
'&g_tk=5381&sign={}&loginUin=0'\
'&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8¬ice=0&platform=yqq.json&needNewCode=0'\
'&data={}'.format(sign,parse.quote(data))
html = requests.get(url,headers = headers).json()
songs_num = html['singerSongList']['data']['totalNum']
for number in range(0,songs_num,100):
data = '{"comm":{"ct":24,"cv":0},"singerSongList":{"method":"GetSingerSongList","param":'\
'{"order":1,"singerMid":"%s","begin":%s,"num":%s}'\
',"module":"musichall.song_list_server"}}'%(str(mid),str(number),str(songs_num))
sign = get_sign(data)
url = 'https://u.y.qq.com/cgi-bin/musics.fcg?-=getSingerSong4707786209273719'\
'&g_tk=5381&sign={}&loginUin=0'\
'&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8¬ice=0&platform=yqq.json&needNewCode=0'\
'&data={}'.format(sign,parse.quote(data))
html = requests.get(url,headers = headers).json()
datas = html['singerSongList']['data']['songList']
for d in datas:
sing_name = d['songInfo']['title']
song_mid = d['songInfo']['mid']
try:
lock.acquire()
session.add(Song(song_name = sing_name,
song_singer = singer_name,
song_mid = song_mid))
session.commit()
lock.release()
print('commit')
except:
session.rollback()
print('rollbeak')
print('歌手名字：{}\t歌曲名字：{}\t歌曲ID：{}'.format(singer_name,sing_name,song_mid))
download(song_mid,sing_name,singer_name)
def download(song_mid,sing_name,singer_name):
qq_number = '請在這裡寫你的qq號'
try:qq_number = str(int(qq_number))
except:raise 'qq號未填寫'
data = '{"req":{"module":"CDN.SrfCdnDispatchServer","method":"GetCdnDispatch"'\
',"param":{"guid":"4803422090","calltype":0,"userip":""}},'\
'"req_0":{"module":"vkey.GetVkeyServer","method":"CgiGetVkey",'\
'"param":{"guid":"4803422090","songmid":["%s"],"songtype":[0],'\
'"uin":"%s","loginflag":1,"platform":"20"}},"comm":{"uin":%s,"format":"json","ct":24,"cv":0}}'%(str(song_mid),str(qq_number),str(qq_number))
sign = get_sign(data)
url = 'https://u.y.qq.com/cgi-bin/musics.fcg?-=getplaysongvkey27494207511290925'\
'&g_tk=1291538537&sign={}&loginUin={}'\
'&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8¬ice=0'\
'&platform=yqq.json&needNewCode=0&data={}'.format(sign,qq_number,parse.quote(data))
html = requests.get(url,headers = headers).json()
try:
purl = html['req_0']['data']['midurlinfo'][0]['purl']
url = 'http://119.147.228.27/amobile.music.tc.qq.com/{}'.format(purl)
html = requests.get(url,headers = headers)
html.encoding = 'utf-8'
sing_file_name = '{} -- {}'.format(sing_name,singer_name)
filename = './QQ音樂/歌曲'
if not os.path.exists(filename):
os.makedirs(filename)
with open('./QQ音樂/歌曲/{}.m4a'.format(sing_file_name),'wb') as f:
print('\n正在下載{}歌曲.....\n'.format(sing_file_name))
f.write(html.content)
except:
print('查詢許可權失敗，或沒有查到對應的歌曲')
if __name__ == "__main__":
myProcess()
db.py
from sqlalchemy import Column,Integer,String,create_engine
from sqlalchemy.orm import sessionmaker,scoped_session
from sqlalchemy.ext.declarative import declarative_base
#此處沒有使用pymysql的驅動
#請安裝pip install mysql-connector-python
#engine中的 mysqlconnector 為 mysql官網驅動
engine = create_engine('mysql+mysqlconnector://root:root@localhost:3306/test?charset=utf8',
max_overflow = 500,#超過連線池大小外最多可以建立的連結
pool_size = 100,#連線池大小
echo = False,#偵錯資訊展示
)
Base = declarative_base()
class Song(Base):
__tablename__ = 'song'
song_id = Column(Integer,primary_key = True,autoincrement = True)
song_name = Column(String(64))
song_ablum = Column(String(64))
song_mid = Column(String(50))
song_singer = Column(String(50))
Base.metadata.create_all(engine)
DBsession = sessionmaker(bind = engine)
SQLsession = scoped_session(DBsession)
get_sign.js
this.window = this;
var sign = null;
!function(n, t) {
"object" == typeof exports && "undefined" != typeof module ? module.exports = t() : "function" == typeof define && define.amd ? define(t) : (n = n || self).getSecuritySign = t()
} (this,
function() {
"use strict";
var n = function() {
if ("undefined" != typeof self) return self;
if ("undefined" != typeof window) return window;
if ("undefined" != typeof global) return global;
throw new Error("unable to locate global object")
} ();
n.__sign_hash_20200305 = function(n) {
function l(n, t) {
var o = (65535 & n) + (65535 & t);
return (n >> 16) + (t >> 16) + (o >> 16) << 16 | 65535 & o
}
function r(n, t, o, e, u, p) {
return l((i = l(l(t, n), l(e, p))) << (r = u) | i >>> 32 - r, o);
var i, r
}
function g(n, t, o, e, u, p, i) {
return r(t & o | ~t & e, n, t, u, p, i)
}
function a(n, t, o, e, u, p, i) {
return r(t & e | o & ~e, n, t, u, p, i)
}
function s(n, t, o, e, u, p, i) {
return r(t ^ o ^ e, n, t, u, p, i)
}
function v(n, t, o, e, u, p, i) {
return r(o ^ (t | ~e), n, t, u, p, i)
}
function t(n) {
return function(n) {
var t, o = "";
for (t = 0; t < 32 * n.length; t += 8) o += String.fromCharCode(n[t >> 5] >>> t % 32 & 255);
return o
} (function(n, t) {
n[t >> 5] |= 128 << t % 32,
n[14 + (t + 64 >>> 9 << 4)] = t;
var o, e, u, p, i, r = 1732584193,
f = -271733879,
h = -1732584194,
c = 271733878;
for (o = 0; o < n.length; o += 16) r = g(e = r, u = f, p = h, i = c, n[o], 7, -680876936),
c = g(c, r, f, h, n[o + 1], 12, -389564586),
h = g(h, c, r, f, n[o + 2], 17, 606105819),
f = g(f, h, c, r, n[o + 3], 22, -1044525330),
r = g(r, f, h, c, n[o + 4], 7, -176418897),
c = g(c, r, f, h, n[o + 5], 12, 1200080426),
h = g(h, c, r, f, n[o + 6], 17, -1473231341),
f = g(f, h, c, r, n[o + 7], 22, -45705983),
r = g(r, f, h, c, n[o + 8], 7, 1770035416),
c = g(c, r, f, h, n[o + 9], 12, -1958414417),
h = g(h, c, r, f, n[o + 10], 17, -42063),
f = g(f, h, c, r, n[o + 11], 22, -1990404162),
r = g(r, f, h, c, n[o + 12], 7, 1804603682),
c = g(c, r, f, h, n[o + 13], 12, -40341101),
h = g(h, c, r, f, n[o + 14], 17, -1502002290),
r = a(r, f = g(f, h, c, r, n[o + 15], 22, 1236535329), h, c, n[o + 1], 5, -165796510),
c = a(c, r, f, h, n[o + 6], 9, -1069501632),
h = a(h, c, r, f, n[o + 11], 14, 643717713),
f = a(f, h, c, r, n[o], 20, -373897302),
r = a(r, f, h, c, n[o + 5], 5, -701558691),
c = a(c, r, f, h, n[o + 10], 9, 38016083),
h = a(h, c, r, f, n[o + 15], 14, -660478335),
f = a(f, h, c, r, n[o + 4], 20, -405537848),
r = a(r, f, h, c, n[o + 9], 5, 568446438),
c = a(c, r, f, h, n[o + 14], 9, -1019803690),
h = a(h, c, r, f, n[o + 3], 14, -187363961),
f = a(f, h, c, r, n[o + 8], 20, 1163531501),
r = a(r, f, h, c, n[o + 13], 5, -1444681467),
c = a(c, r, f, h, n[o + 2], 9, -51403784),
h = a(h, c, r, f, n[o + 7], 14, 1735328473),
r = s(r, f = a(f, h, c, r, n[o + 12], 20, -1926607734), h, c, n[o + 5], 4, -378558),
c = s(c, r, f, h, n[o + 8], 11, -2022574463),
h = s(h, c, r, f, n[o + 11], 16, 1839030562),
f = s(f, h, c, r, n[o + 14], 23, -35309556),
r = s(r, f, h, c, n[o + 1], 4, -1530992060),
c = s(c, r, f, h, n[o + 4], 11, 1272893353),
h = s(h, c, r, f, n[o + 7], 16, -155497632),
f = s(f, h, c, r, n[o + 10], 23, -1094730640),
r = s(r, f, h, c, n[o + 13], 4, 681279174),
c = s(c, r, f, h, n[o], 11, -358537222),
h = s(h, c, r, f, n[o + 3], 16, -722521979),
f = s(f, h, c, r, n[o + 6], 23, 76029189),
r = s(r, f, h, c, n[o + 9], 4, -640364487),
c = s(c, r, f, h, n[o + 12], 11, -421815835),
h = s(h, c, r, f, n[o + 15], 16, 530742520),
r = v(r, f = s(f, h, c, r, n[o + 2], 23, -995338651), h, c, n[o], 6, -198630844),
c = v(c, r, f, h, n[o + 7], 10, 1126891415),
h = v(h, c, r, f, n[o + 14], 15, -1416354905),
f = v(f, h, c, r, n[o + 5], 21, -57434055),
r = v(r, f, h, c, n[o + 12], 6, 1700485571),
c = v(c, r, f, h, n[o + 3], 10, -1894986606),
h = v(h, c, r, f, n[o + 10], 15, -1051523),
f = v(f, h, c, r, n[o + 1], 21, -2054922799),
r = v(r, f, h, c, n[o + 8], 6, 1873313359),
c = v(c, r, f, h, n[o + 15], 10, -30611744),
h = v(h, c, r, f, n[o + 6], 15, -1560198380),
f = v(f, h, c, r, n[o + 13], 21, 1309151649),
r = v(r, f, h, c, n[o + 4], 6, -145523070),
c = v(c, r, f, h, n[o + 11], 10, -1120210379),
h = v(h, c, r, f, n[o + 2], 15, 718787259),
f = v(f, h, c, r, n[o + 9], 21, -343485551),
r = l(r, e),
f = l(f, u),
h = l(h, p),
c = l(c, i);
return [r, f, h, c]
} (function(n) {
var t, o = [];
for (o[(n.length >> 2) - 1] = void 0, t = 0; t < o.length; t += 1) o[t] = 0;
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return o
} (n), 8 * n.length))
}
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return t(unescape(encodeURIComponent(n)))
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function() {
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g.push([l, g.pop()])
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enumerable: !0
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function() {
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configurable: !0,
enumerable: !0
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Object.defineProperty(n[0], n[1], t)
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function() {
h = c[h++]
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function() {
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g[g.length - 1] && (h = n)
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function() {
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function() {
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function() {
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function() {
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g.length -= n,
t.unshift(null);
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g.push(!g.pop())
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function() {
g.push(~g.pop())
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function() {
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g[g.length - 2] = g[g.length - 2] << g.pop()
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g[g.length - 2] = g[g.length - 2] >> g.pop()
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function() {
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g.push(function n() {
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t[0] = [this],
t[1] = [arguments],
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function() {
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});
function get_sign(data){
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};