【需求】
在 https://www.cnblogs.com/heyang78/p/5712076.html 上有360种颜色及代码，但很遗憾没有十进制的RGB值，使用时需要自己转换一下，此过程依赖网络或计算器，颇为不便。因此，拟设计一爬虫将原有表格内容取出，在其原有颜色代码下添加十进制的RGB值。
具体意图如下图：
【关键点】
取网页内容使用requests，解析网页使用BeautifulSoup，先遍历所有的tr，再取tr下的td，如果其有bgcolor属性，那就是要找的目标。
使用函数int(txt,16)将两位颜色值转换为十进制的颜色值即可。
比如颜色值是bgcolor="#820041"，那么取其R值的方法是bgcolor[1:3]，取十进制R值的方法是r = int(bgcolor[1:3],16)
其它的文本组合有html知识即可，无须赘述。
【代码】
#encoding=utf-8
# 内置网络访问包
import requests
# 内置的urllib.request模块
import urllib.request
# 解析html的BeautifulSoup包，安装方法是pip install BeautifulSoup4
from bs4 import BeautifulSoup
# 引入正则表达式包
import re
# 把请求伪装成浏览器Mozilla
user_agent='Mozilla/4.0 (compatible;MEIE 5.5;windows NT)'
headers={'User-Agent':user_agent}
# 要访问的页码地址
url="https://www.cnblogs.com/heyang78/p/5712076.html"
# 发起请求获取其html内容
html=requests.get(url,headers=headers)
# 使用BeautifulSoup解析html文本
soup= BeautifulSoup(html.text,'html.parser');
# 存储生成的新文本
content=""
# 遍历网页中所有的tr
for tr in soup.find_all('tr'):
#一行tr开始
content=content+"<tr>"
# 遍历tr中的td
for td in tr.find_all('td'):
# 取td的bgcolor属性
bgcolor=td.get("bgcolor")
if bgcolor!=None:
r = int(bgcolor[1:3],16) # red 将16进制的R值转十进制
g = int(bgcolor[3:5],16) # green 将16进制的G值转十进制
b = int(bgcolor[5:7],16) # blue 将16进制的B值转十进制
#print("bgcolor="+bgcolor+" r="+str(r)+" g="+str(g)+" b="+str(b));
#累加成新的三列td
content=content+"<td bgcolor=\""+bgcolor+"\" width=\"60\"> </td>"
content=content+"<td width=\"50\">"+bgcolor+"<br/>("+str(r)+","+str(g)+","+str(b)+")</td>"
#一行tr结束
content=content+"</tr>"
print(content) 【最终打印出来的内容】
<tr><td bgcolor="#000000" width="60"> </td><td width="50">#000000<br/>(0,0,0)</td><td bgcolor="#2f0000" width="60"> </td><td width="50">#2f0000<br/>(47,0,0)</td><td bgcolor="#600030" width="60"> </td><td width="50">#600030<br/>(96,0,48)</td><td bgcolor="#460046" width="60"> </td><td width="50">#460046<br/>(70,0,70)</td><td bgcolor="#28004d" width="60"> </td><td width="50">#28004d<br/>(40,0,77)</td></tr><tr><td bgcolor="#272727" width="60"> </td><td width="50">#272727<br/>(39,39,39)</td><td bgcolor="#4d0000" width="60"> </td><td width="50">#4d0000<br/>(77,0,0)</td><td bgcolor="#820041" width="60"> </td><td width="50">#820041<br/>(130,0,65)</td><td bgcolor="#5e005e" width="60"> </td><td width="50">#5e005e<br/>(94,0,94)</td><td bgcolor="#3a006f" width="60"> </td><td width="50">#3a006f<br/>(58,0,111)</td></tr><tr><td bgcolor="#3c3c3c" width="60"> </td><td width="50">#3c3c3c<br/>(60,60,60)</td><td bgcolor="#600000" width="60"> </td><td width="50">#600000<br/>(96,0,0)</td><td bgcolor="#9f0050" width="60"> </td><td width="50">#9f0050<br/>(159,0,80)</td><td bgcolor="#750075" width="60"> </td><td width="50">#750075<br/>(117,0,117)</td><td bgcolor="#4b0091" width="60"> </td><td width="50">#4b0091<br/>(75,0,145)</td></tr><tr><td bgcolor="#4f4f4f" width="60"> </td><td width="50">#4f4f4f<br/>(79,79,79)</td><td bgcolor="#750000" width="60"> </td><td width="50">#750000<br/>(117,0,0)</td><td bgcolor="#bf0060" width="60"> </td><td width="50">#bf0060<br/>(191,0,96)</td><td bgcolor="#930093" width="60"> </td><td width="50">#930093<br/>(147,0,147)</td><td bgcolor="#5b00ae" width="60"> </td><td width="50">#5b00ae<br/>(91,0,174)</td></tr><tr><td bgcolor="#5b5b5b" width="60"> </td><td width="50">#5b5b5b<br/>(91,91,91)</td><td bgcolor="#930000" width="60"> </td><td width="50">#930000<br/>(147,0,0)</td><td bgcolor="#d9006c" width="60"> </td><td width="50">#d9006c<br/>(217,0,108)</td><td bgcolor="#ae00ae" width="60"> </td><td width="50">#ae00ae<br/>(174,0,174)</td><td bgcolor="#6f00d2" width="60"> </td><td width="50">#6f00d2<br/>(111,0,210)</td></tr><tr><td bgcolor="#6c6c6c" width="60"> </td><td width="50">#6c6c6c<br/>(108,108,108)</td><td bgcolor="#ae0000" width="60"> </td><td width="50">#ae0000<br/>(174,0,0)</td><td bgcolor="#f00078" width="60"> </td><td width="50">#f00078<br/>(240,0,120)</td><td bgcolor="#d200d2" width="60"> </td><td width="50">#d200d2<br/>(210,0,210)</td><td bgcolor="#8600ff" width="60"> </td><td width="50">#8600ff<br/>(134,0,255)</td></tr><tr><td bgcolor="#7b7b7b" width="60"> </td><td width="50">#7b7b7b<br/>(123,123,123)</td><td bgcolor="#ce0000" width="60"> </td><td width="50">#ce0000<br/>(206,0,0)</td><td bgcolor="#ff0080" width="60"> </td><td width="50">#ff0080<br/>(255,0,128)</td><td bgcolor="#e800e8" width="60"> </td><td width="50">#e800e8<br/>(232,0,232)</td><td bgcolor="#921aff" width="60"> </td><td width="50">#921aff<br/>(146,26,255)</td></tr><tr><td bgcolor="#8e8e8e" width="60"> </td><td width="50">#8e8e8e<br/>(142,142,142)</td><td bgcolor="#ea0000" width="60"> </td><td width="50">#ea0000<br/>(234,0,0)</td><td bgcolor="#ff359a" width="60"> </td><td width="50">#ff359a<br/>(255,53,154)</td><td bgcolor="#ff00ff" width="60"> </td><td width="50">#ff00ff<br/>(255,0,255)</td><td bgcolor="#9f35ff" width="60"> </td><td width="50">#9f35ff<br/>(159,53,255)</td></tr><tr><td bgcolor="#9d9d9d" width="60"> </td><td width="50">#9d9d9d<br/>(157,157,157)</td><td bgcolor="#ff0000" width="60"> </td><td width="50">#ff0000<br/>(255,0,0)</td><td bgcolor="#ff60af" width="60"> </td><td width="50">#ff60af<br/>(255,96,175)</td><td bgcolor="#ff44ff" width="60"> </td><td width="50">#ff44ff<br/>(255,68,255)</td><td bgcolor="#b15bff" width="60"> </td><td width="50">#b15bff<br/>(177,91,255)</td></tr><tr><td bgcolor="#adadad" width="60"> </td><td width="50">#adadad<br/>(173,173,173)</td><td bgcolor="#ff2d2d" width="60"> </td><td width="50">#ff2d2d<br/>(255,45,45)</td><td bgcolor="#ff79bc" width="60"> 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bgcolor="#aaaaff" width="60"> </td><td width="50">#aaaaff<br/>(170,170,255)</td><td bgcolor="#84c1ff" width="60"> </td><td width="50">#84c1ff<br/>(132,193,255)</td><td bgcolor="#a6ffff" width="60"> </td><td width="50">#a6ffff<br/>(166,255,255)</td><td bgcolor="#96fed1" width="60"> </td><td width="50">#96fed1<br/>(150,254,209)</td><td bgcolor="#93ff93" width="60"> </td><td width="50">#93ff93<br/>(147,255,147)</td></tr><tr><td bgcolor="#b9b9ff" width="60"> </td><td width="50">#b9b9ff<br/>(185,185,255)</td><td bgcolor="#97cbff" width="60"> </td><td width="50">#97cbff<br/>(151,203,255)</td><td bgcolor="#bbffff" width="60"> </td><td width="50">#bbffff<br/>(187,255,255)</td><td bgcolor="#adfedc" width="60"> </td><td width="50">#adfedc<br/>(173,254,220)</td><td bgcolor="#a6ffa6" width="60"> </td><td width="50">#a6ffa6<br/>(166,255,166)</td></tr><tr><td bgcolor="#ceceff" width="60"> </td><td width="50">#ceceff<br/>(206,206,255)</td><td bgcolor="#acd6ff" width="60"> </td><td 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width="50">#642100<br/>(100,33,0)</td></tr><tr><td bgcolor="#548c00" width="60"> </td><td width="50">#548c00<br/>(84,140,0)</td><td bgcolor="#5b5b00" width="60"> </td><td width="50">#5b5b00<br/>(91,91,0)</td><td bgcolor="#796400" width="60"> </td><td width="50">#796400<br/>(121,100,0)</td><td bgcolor="#9f5000" width="60"> </td><td width="50">#9f5000<br/>(159,80,0)</td><td bgcolor="#842b00" width="60"> </td><td width="50">#842b00<br/>(132,43,0)</td></tr><tr><td bgcolor="#64a600" width="60"> </td><td width="50">#64a600<br/>(100,166,0)</td><td bgcolor="#737300" width="60"> </td><td width="50">#737300<br/>(115,115,0)</td><td bgcolor="#977c00" width="60"> </td><td width="50">#977c00<br/>(151,124,0)</td><td bgcolor="#bb5e00" width="60"> </td><td width="50">#bb5e00<br/>(187,94,0)</td><td bgcolor="#a23400" width="60"> </td><td width="50">#a23400<br/>(162,52,0)</td></tr><tr><td bgcolor="#73bf00" width="60"> </td><td width="50">#73bf00<br/>(115,191,0)</td><td bgcolor="#8c8c00" width="60"> </td><td width="50">#8c8c00<br/>(140,140,0)</td><td bgcolor="#ae8f00" width="60"> </td><td width="50">#ae8f00<br/>(174,143,0)</td><td bgcolor="#d26900" width="60"> </td><td width="50">#d26900<br/>(210,105,0)</td><td bgcolor="#bb3d00" width="60"> </td><td width="50">#bb3d00<br/>(187,61,0)</td></tr><tr><td bgcolor="#82d900" width="60"> </td><td width="50">#82d900<br/>(130,217,0)</td><td bgcolor="#a6a600" width="60"> </td><td width="50">#a6a600<br/>(166,166,0)</td><td bgcolor="#c6a300" width="60"> </td><td width="50">#c6a300<br/>(198,163,0)</td><td bgcolor="#ea7500" width="60"> </td><td width="50">#ea7500<br/>(234,117,0)</td><td bgcolor="#d94600" width="60"> </td><td width="50">#d94600<br/>(217,70,0)</td></tr><tr><td bgcolor="#8cea00" width="60"> </td><td width="50">#8cea00<br/>(140,234,0)</td><td bgcolor="#c4c400" width="60"> </td><td width="50">#c4c400<br/>(196,196,0)</td><td bgcolor="#d9b300" width="60"> </td><td width="50">#d9b300<br/>(217,179,0)</td><td bgcolor="#ff8000" width="60"> </td><td width="50">#ff8000<br/>(255,128,0)</td><td bgcolor="#f75000" width="60"> </td><td width="50">#f75000<br/>(247,80,0)</td></tr><tr><td bgcolor="#9aff02" width="60"> </td><td width="50">#9aff02<br/>(154,255,2)</td><td bgcolor="#e1e100" width="60"> </td><td width="50">#e1e100<br/>(225,225,0)</td><td bgcolor="#eac100" width="60"> </td><td width="50">#eac100<br/>(234,193,0)</td><td bgcolor="#ff9224" width="60"> </td><td width="50">#ff9224<br/>(255,146,36)</td><td bgcolor="#ff5809" width="60"> </td><td width="50">#ff5809<br/>(255,88,9)</td></tr><tr><td bgcolor="#a8ff24" width="60"> </td><td width="50">#a8ff24<br/>(168,255,36)</td><td bgcolor="#f9f900" width="60"> </td><td width="50">#f9f900<br/>(249,249,0)</td><td bgcolor="#ffd306" width="60"> </td><td width="50">#ffd306<br/>(255,211,6)</td><td bgcolor="#ffa042" width="60"> </td><td width="50">#ffa042<br/>(255,160,66)</td><td bgcolor="#ff8040" width="60"> </td><td width="50">#ff8040<br/>(255,128,64)</td></tr><tr><td bgcolor="#b7ff4a" width="60"> </td><td width="50">#b7ff4a<br/>(183,255,74)</td><td bgcolor="#ffff37" width="60"> </td><td width="50">#ffff37<br/>(255,255,55)</td><td bgcolor="#ffdc35" width="60"> </td><td width="50">#ffdc35<br/>(255,220,53)</td><td bgcolor="#ffaf60" width="60"> </td><td width="50">#ffaf60<br/>(255,175,96)</td><td bgcolor="#ff8f59" width="60"> </td><td width="50">#ff8f59<br/>(255,143,89)</td></tr><tr><td bgcolor="#c2ff68" width="60"> </td><td width="50">#c2ff68<br/>(194,255,104)</td><td bgcolor="#ffff6f" width="60"> </td><td width="50">#ffff6f<br/>(255,255,111)</td><td bgcolor="#ffe153" width="60"> </td><td width="50">#ffe153<br/>(255,225,83)</td><td bgcolor="#ffbb77" width="60"> </td><td width="50">#ffbb77<br/>(255,187,119)</td><td bgcolor="#ff9d6f" width="60"> </td><td width="50">#ff9d6f<br/>(255,157,111)</td></tr><tr><td bgcolor="#ccff80" width="60"> </td><td width="50">#ccff80<br/>(204,255,128)</td><td bgcolor="#ffff93" width="60"> </td><td width="50">#ffff93<br/>(255,255,147)</td><td bgcolor="#ffe66f" width="60"> </td><td width="50">#ffe66f<br/>(255,230,111)</td><td bgcolor="#ffc78e" width="60"> </td><td width="50">#ffc78e<br/>(255,199,142)</td><td bgcolor="#ffad86" width="60"> </td><td width="50">#ffad86<br/>(255,173,134)</td></tr><tr><td bgcolor="#d3ff93" width="60"> </td><td width="50">#d3ff93<br/>(211,255,147)</td><td bgcolor="#ffffaa" width="60"> </td><td width="50">#ffffaa<br/>(255,255,170)</td><td bgcolor="#ffed97" width="60"> </td><td width="50">#ffed97<br/>(255,237,151)</td><td bgcolor="#ffd1a4" width="60"> </td><td width="50">#ffd1a4<br/>(255,209,164)</td><td bgcolor="#ffbd9d" width="60"> </td><td width="50">#ffbd9d<br/>(255,189,157)</td></tr><tr><td bgcolor="#deffac" width="60"> </td><td width="50">#deffac<br/>(222,255,172)</td><td bgcolor="#ffffb9" width="60"> </td><td width="50">#ffffb9<br/>(255,255,185)</td><td bgcolor="#fff0ac" width="60"> </td><td width="50">#fff0ac<br/>(255,240,172)</td><td bgcolor="#ffdcb9" width="60"> </td><td width="50">#ffdcb9<br/>(255,220,185)</td><td bgcolor="#ffcbb3" width="60"> </td><td width="50">#ffcbb3<br/>(255,203,179)</td></tr><tr><td bgcolor="#e8ffc4" width="60"> </td><td width="50">#e8ffc4<br/>(232,255,196)</td><td bgcolor="#ffffce" width="60"> </td><td width="50">#ffffce<br/>(255,255,206)</td><td bgcolor="#fff4c1" width="60"> </td><td width="50">#fff4c1<br/>(255,244,193)</td><td bgcolor="#ffe4ca" width="60"> </td><td width="50">#ffe4ca<br/>(255,228,202)</td><td bgcolor="#ffdac8" width="60"> </td><td width="50">#ffdac8<br/>(255,218,200)</td></tr><tr><td bgcolor="#efffd7" width="60"> </td><td width="50">#efffd7<br/>(239,255,215)</td><td bgcolor="#ffffdf" width="60"> </td><td width="50">#ffffdf<br/>(255,255,223)</td><td bgcolor="#fff8d7" width="60"> </td><td width="50">#fff8d7<br/>(255,248,215)</td><td bgcolor="#ffeedd" width="60"> </td><td width="50">#ffeedd<br/>(255,238,221)</td><td bgcolor="#ffe6d9" width="60"> </td><td width="50">#ffe6d9<br/>(255,230,217)</td></tr><tr><td bgcolor="#f5ffe8" width="60"> </td><td width="50">#f5ffe8<br/>(245,255,232)</td><td bgcolor="#fffff4" width="60"> </td><td width="50">#fffff4<br/>(255,255,244)</td><td bgcolor="#fffcec" width="60"> </td><td width="50">#fffcec<br/>(255,252,236)</td><td bgcolor="#fffaf4" width="60"> </td><td width="50">#fffaf4<br/>(255,250,244)</td><td bgcolor="#fff3ee" width="60"> </td><td width="50">#fff3ee<br/>(255,243,238)</td></tr><tr><td bgcolor="#613030" width="60"> </td><td width="50">#613030<br/>(97,48,48)</td><td bgcolor="#616130" width="60"> </td><td width="50">#616130<br/>(97,97,48)</td><td bgcolor="#336666" width="60"> </td><td width="50">#336666<br/>(51,102,102)</td><td bgcolor="#484891" width="60"> </td><td width="50">#484891<br/>(72,72,145)</td><td bgcolor="#6c3365" width="60"> </td><td width="50">#6c3365<br/>(108,51,101)</td></tr><tr><td bgcolor="#743a3a" width="60"> </td><td width="50">#743a3a<br/>(116,58,58)</td><td bgcolor="#707038" width="60"> </td><td width="50">#707038<br/>(112,112,56)</td><td bgcolor="#3d7878" width="60"> </td><td width="50">#3d7878<br/>(61,120,120)</td><td bgcolor="#5151a2" width="60"> </td><td width="50">#5151a2<br/>(81,81,162)</td><td bgcolor="#7e3d76" width="60"> </td><td width="50">#7e3d76<br/>(126,61,118)</td></tr><tr><td bgcolor="#804040" width="60"> </td><td width="50">#804040<br/>(128,64,64)</td><td bgcolor="#808040" width="60"> </td><td width="50">#808040<br/>(128,128,64)</td><td bgcolor="#408080" width="60"> </td><td width="50">#408080<br/>(64,128,128)</td><td bgcolor="#5a5aad" width="60"> </td><td width="50">#5a5aad<br/>(90,90,173)</td><td bgcolor="#8f4586" width="60"> </td><td width="50">#8f4586<br/>(143,69,134)</td></tr><tr><td bgcolor="#984b4b" width="60"> </td><td width="50">#984b4b<br/>(152,75,75)</td><td bgcolor="#949449" width="60"> </td><td width="50">#949449<br/>(148,148,73)</td><td bgcolor="#4f9d9d" width="60"> </td><td width="50">#4f9d9d<br/>(79,157,157)</td><td bgcolor="#7373b9" width="60"> </td><td width="50">#7373b9<br/>(115,115,185)</td><td bgcolor="#9f4d95" width="60"> </td><td width="50">#9f4d95<br/>(159,77,149)</td></tr><tr><td bgcolor="#ad5a5a" width="60"> </td><td width="50">#ad5a5a<br/>(173,90,90)</td><td bgcolor="#a5a552" width="60"> </td><td width="50">#a5a552<br/>(165,165,82)</td><td bgcolor="#5cadad" width="60"> </td><td width="50">#5cadad<br/>(92,173,173)</td><td bgcolor="#8080c0" width="60"> </td><td width="50">#8080c0<br/>(128,128,192)</td><td bgcolor="#ae57a4" width="60"> </td><td width="50">#ae57a4<br/>(174,87,164)</td></tr><tr><td bgcolor="#b87070" width="60"> </td><td width="50">#b87070<br/>(184,112,112)</td><td bgcolor="#afaf61" width="60"> </td><td width="50">#afaf61<br/>(175,175,97)</td><td bgcolor="#6fb7b7" width="60"> </td><td width="50">#6fb7b7<br/>(111,183,183)</td><td bgcolor="#9999cc" width="60"> </td><td width="50">#9999cc<br/>(153,153,204)</td><td bgcolor="#b766ad" width="60"> </td><td width="50">#b766ad<br/>(183,102,173)</td></tr><tr><td bgcolor="#c48888" width="60"> </td><td width="50">#c48888<br/>(196,136,136)</td><td bgcolor="#b9b973" width="60"> </td><td width="50">#b9b973<br/>(185,185,115)</td><td bgcolor="#81c0c0" width="60"> </td><td width="50">#81c0c0<br/>(129,192,192)</td><td bgcolor="#a6a6d2" width="60"> </td><td width="50">#a6a6d2<br/>(166,166,210)</td><td bgcolor="#c07ab8" width="60"> </td><td width="50">#c07ab8<br/>(192,122,184)</td></tr><tr><td bgcolor="#cf9e9e" width="60"> </td><td width="50">#cf9e9e<br/>(207,158,158)</td><td bgcolor="#c2c287" width="60"> </td><td width="50">#c2c287<br/>(194,194,135)</td><td bgcolor="#95caca" width="60"> </td><td width="50">#95caca<br/>(149,202,202)</td><td bgcolor="#b8b8dc" width="60"> </td><td width="50">#b8b8dc<br/>(184,184,220)</td><td bgcolor="#ca8ec2" width="60"> </td><td width="50">#ca8ec2<br/>(202,142,194)</td></tr><tr><td bgcolor="#d9b3b3" width="60"> </td><td width="50">#d9b3b3<br/>(217,179,179)</td><td bgcolor="#cdcd9a" width="60"> </td><td width="50">#cdcd9a<br/>(205,205,154)</td><td bgcolor="#a3d1d1" width="60"> </td><td width="50">#a3d1d1<br/>(163,209,209)</td><td bgcolor="#c7c7e2" width="60"> </td><td width="50">#c7c7e2<br/>(199,199,226)</td><td bgcolor="#d2a2cc" width="60"> </td><td width="50">#d2a2cc<br/>(210,162,204)</td></tr><tr><td bgcolor="#e1c4c4" width="60"> </td><td width="50">#e1c4c4<br/>(225,196,196)</td><td bgcolor="#d6d6ad" width="60"> </td><td width="50">#d6d6ad<br/>(214,214,173)</td><td bgcolor="#b3d9d9" width="60"> </td><td width="50">#b3d9d9<br/>(179,217,217)</td><td bgcolor="#d8d8eb" width="60"> </td><td width="50">#d8d8eb<br/>(216,216,235)</td><td bgcolor="#dab1d5" width="60"> </td><td width="50">#dab1d5<br/>(218,177,213)</td></tr><tr><td bgcolor="#ebd6d6" width="60"> </td><td width="50">#ebd6d6<br/>(235,214,214)</td><td bgcolor="#dedebe" width="60"> </td><td width="50">#dedebe<br/>(222,222,190)</td><td bgcolor="#c4e1e1" width="60"> </td><td width="50">#c4e1e1<br/>(196,225,225)</td><td bgcolor="#e6e6f2" width="60"> </td><td width="50">#e6e6f2<br/>(230,230,242)</td><td bgcolor="#e2c2de" width="60"> </td><td width="50">#e2c2de<br/>(226,194,222)</td></tr><tr><td bgcolor="#f2e6e6" width="60"> </td><td width="50">#f2e6e6<br/>(242,230,230)</td><td bgcolor="#e8e8d0" width="60"> </td><td width="50">#e8e8d0<br/>(232,232,208)</td><td bgcolor="#d1e9e9" width="60"> </td><td width="50">#d1e9e9<br/>(209,233,233)</td><td bgcolor="#f3f3fa" width="60"> </td><td width="50">#f3f3fa<br/>(243,243,250)</td><td bgcolor="#ebd3e8" width="60"> </td><td width="50">#ebd3e8<br/>(235,211,232)</td></tr>【将结果放入HTML的最终成果】
https://www.cnblogs.com/heyang78/p/3419103.html