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標(biāo)簽： 源代碼
上傳時(shí)間： 2017-11-17
上傳用戶：wendingchang
CCS樣式選擇符，初學(xué)者，設(shè)計(jì)，DW，網(wǎng)頁(yè)制作，大一作業(yè) 部分預(yù)覽： <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>CSS樣式選擇符</title> <style type="text/css"> body { background-image:url(images/%E8%83%8C%E6%99%AF%E5%9B%BE%E7%89%87.jpg); background-repeat:repeat; } .class1 { text-align:center; font-weight:bolder; } .class2 { font-family:"仿宋"; text-indent:8em; } .class3 { font-size:18px; font-family:"宋體"; text-indent:4em; } #id1 { font-family:Zombie, Verdana, "Comic Sans MS"; font-style:oblique; font-size:64px; } #id2 { font-family:"黑體"; font-size:36px; } #id3 { color:#F69; font-weight:bolder; text-shadow:#FCC; } </style> </head> <body> <table width="780" height="1555" border="0" cellspacing="0" align="center" bgcolor="#FFFFFF"> <tr height="30"> <td align="center"><img src="images/頂部圖片.jpg" /></td> </tr>
標(biāo)簽： CCS 網(wǎng)頁(yè)設(shè)計(jì)
上傳時(shí)間： 2017-12-07
上傳用戶：圈圈Ace
css美化有序列表，貼出部分css代碼 <ol > <li>先涂粉底再涂防曬</li> <li>先涂防曬再涂粉底</li> </ol> <!doctype html> <html> <head> <title>CSS3 ordered list styles - demo</title> <style> body{ margin: 40px auto; width: 500px; } /* -------------------------------------- */ ol{ counter-reset: li; list-style: none; *list-style: decimal; font: 15px 'trebuchet MS', 'lucida sans'; padding: 0; margin-bottom: 4em; text-shadow: 0 1px 0 rgba(255,255,255,.5); } ol ol{ margin: 0 0 0 2em; } /* -------------------------------------- */
上傳時(shí)間： 2018-08-22
上傳用戶：53660542
以后再也不用擔(dān)心寫(xiě)爬蟲(chóng)ip被封，不用擔(dān)心沒(méi)錢(qián)買(mǎi)代理ip的煩惱了 在使用python寫(xiě)爬蟲(chóng)時(shí)候，你會(huì)遇到所要爬取的網(wǎng)站有反爬取技術(shù)比如用同一個(gè)IP反復(fù)爬取同一個(gè)網(wǎng)頁(yè)，很可能會(huì)被封。如何有效的解決這個(gè)問(wèn)題呢？我們可以使用代理ip，來(lái)設(shè)置代理ip池。 現(xiàn)在教大家一個(gè)可獲取大量免費(fèi)有效快速的代理ip方法，我們?cè)L問(wèn)西刺免費(fèi)代理ip網(wǎng)址 這里面提供了許多代理ip，但是我們嘗試過(guò)后會(huì)發(fā)現(xiàn)并不是每一個(gè)都是有效的。所以我們現(xiàn)在所要做的就是從里面提供的篩選出有效快速穩(wěn)定的ip。 以下介紹的免費(fèi)獲取代理ip池的方法： 優(yōu)點(diǎn)：免費(fèi)、數(shù)量多、有效、速度快 缺點(diǎn)：需要定期篩選 主要思路： 從網(wǎng)址上爬取ip地址并存儲(chǔ) 驗(yàn)證ip是否能使用-（隨機(jī)訪問(wèn)網(wǎng)址判斷響應(yīng)碼） 格式化ip地址 代碼如下： 1.導(dǎo)入包 import requests from lxml import etree import time 1 2 3 2.獲取西刺免費(fèi)代理ip網(wǎng)址上的代理ip def get_all_proxy(): url = 'http://www.xicidaili.com/nn/1' headers = { 'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36', } response = requests.get(url, headers=headers) html_ele = etree.HTML(response.text) ip_eles = html_ele.xpath('//table[@id="ip_list"]/tr/td[2]/text()') port_ele = html_ele.xpath('//table[@id="ip_list"]/tr/td[3]/text()') proxy_list = [] for i in range(0,len(ip_eles)): proxy_str = 'http://' + ip_eles[i] + ':' + port_ele[i] proxy_list.append(proxy_str) return proxy_list 1 2 3 4 5 6 7 8 9 10 11 12 13 14 3.驗(yàn)證獲取的ip def check_all_proxy(proxy_list): valid_proxy_list = [] for proxy in proxy_list: url = 'http://www.baidu.com/' proxy_dict = { 'http': proxy } try: start_time = time.time() response = requests.get(url, proxies=proxy_dict, timeout=5) if response.status_code == 200: end_time = time.time() print('代理可用：' + proxy) print('耗時(shí):' + str(end_time - start_time)) valid_proxy_list.append(proxy) else: print('代理超時(shí)') except: print('代理不可用--------------->'+proxy) return valid_proxy_list 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 4.輸出獲取ip池 if __name__ == '__main__': proxy_list = get_all_proxy() valid_proxy_list = check_all_proxy(proxy_list) print('--'*30) print(valid_proxy_list) 1 2 3 4 5 技術(shù)能力有限歡迎提出意見(jiàn)，保證積極向上不斷學(xué)習(xí) ———————————————— 版權(quán)聲明：本文為CSDN博主「彬小二」的原創(chuàng)文章，遵循 CC 4.0 BY-SA 版權(quán)協(xié)議，轉(zhuǎn)載請(qǐng)附上原文出處鏈接及本聲明。 原文鏈接：https://blog.csdn.net/qq_39884947/article/details/86609930
上傳時(shí)間： 2019-11-15
上傳用戶：fygwz1982
Delphi三層數(shù)據(jù)庫(kù)連接池 (1) Connection Pool for Delphi release notes ------------------------------------------------------------------------------- This document contains: - Short description of the product - Other text files - TRIAL version limitations - Delphi - versions supported - Installation of Connection Pool for Delphi - Installation of Connection Pool for Delphi help file - Ordering information - Support and Web resources - Thanks To
標(biāo)簽： Delphi 數(shù)據(jù)庫(kù) 連接
上傳時(shí)間： 2019-12-12
上傳用戶：me2008
The understanding of electrical system design has become increas- ingly important, not only to the electrical designer, but to safety, plant and project engineers as well. With the advent of high energy costs, plant and project engineers have needed to become more aware of electrical systems. Both safety and energy efficiency will be covered in this text along with practical application problems for industrial and commercial electrical design.
標(biāo)簽： Electrical Efficient Handbook Systems Design
上傳時(shí)間： 2020-05-25
上傳用戶：shancjb
Firstly, this book is set at a level suitable for senior undergraduate and postgraduate students who wish to understand the fundamentals and applications of adaptive array antenna systems. Array fundamentals are described in the text, and examples which demonstrate theoretical concepts are included throughout the book, as well as summaries and questions at the end of each chapter.
標(biāo)簽： Applications Fundamentals Adaptive Systems Array and
上傳時(shí)間： 2020-05-26
上傳用戶：shancjb
This book is an entry-level text on the technology of telecommunications. It has been crafted with the newcomer in mind. The eighteen chapters of text have been prepared for high-school graduates who understand algebra, logarithms, and basic electrical prin- ciples such as Ohm’s law. However, many users require support in these areas so Appen- dices A and B review the essentials of electricity and mathematics through logarithms.
標(biāo)簽： Telecommunications Fundamentals 1st of ed
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
This book is an entry-level text on the technology of telecommunications. It has been crafted with the newcomer in mind. The twenty-one chapters of text have been prepared for high-school graduates who understand algebra, logarithms, and the basic principles of electricity such as Ohm’s law. However, it is appreciated that many readers require support in these areas. Appendices A and B review the essentials of electricity and mathematics up through logarithms. This material was placed in the appendices so as not to distract from the main theme, the technology of telecommunication systems. Another topic that many in the industry find difficult is the use of decibels and derived units. Appendix C provides the reader a basic understanding of decibels and their applications. The only mathematics necessary is an understanding of the powers of ten
標(biāo)簽： Telecommunications Fundamentals 2nd of ed
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
Our original effort in writing this book was to create a starting point for those in the business community who did not have a high level of technical expertise but needed to have some understanding of the technical functions of their information and communication technologies (ICT) in a corporate environment. As was true with the first edition of this book, if you are already an engineer, find some other form of pleasure reading—this text is not designed for you!
標(biāo)簽： Communications Introduction Technologies to
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
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