初級 美國腔 1693 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
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回報字幕錯誤
The goal of the first three units in this course is to build a Web crawler
that will collect data from the Web for our search engine.
And to learn about big ideas in Computing by doing that.
In Unit 1, we'll get started by extracting the first link on a web page.
A Web crawler finds web pages for our search engine
by starting from a "seed" page and following links on that page to find other pages.
Each of those links lead to some new web page, which itself could have links that lead to other pages.
As we follow those links, we'll find more and more web pages
building a collection of data that we'll use for our search engine.
A web page is really just a chunk of text that comes from the Internet into your Web browser.
We'll talk more about how that works in Unit 4.
But for now, the important thing to understand is that
a link is really just a special kind of text in that web page.
When you click on a link in your browser it will direct you to a new page.
And you can keep following those links as a human.
What we'll do in this Unit is write a program to extract that first link from the web page.
In later units, we'll figure out how to extract all the links and build their collection for our search engine
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

搜尋引擎是怎麼抓到網頁的? (Overview of the Unit - Intro to Computer Science)

1693 分類 收藏
羅紹桀 發佈於 2015 年 6 月 10 日
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  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔