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Commit b0339b9

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添加爬虫定义
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‎爬虫预备知识.md‎

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#### 爬虫定义
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> 网络爬虫(又被称为网页蜘蛛,网络机器人)就是模拟浏览器发送网络请求,接收请求响应,一种按照一定的规则,自动地抓取互联网信息的程序。
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> 爬虫就是模拟浏览器的行为,越像越好,越像就越不容易被发现。
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> 原则上,只要是浏览器(客户端)能做的事情,爬虫都能够做。
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#### 爬虫的分类

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