Hosts文件是什么?
：Hosts文件主要作用是定義IP地址和主機名的映射關系，是一個映射IP地址和主機名的規定。可以用文本文件打開!當用戶在瀏覽器中輸入一個需要登錄的網址時，系統會首先自動從Hosts文件中尋找對應的IP地址，一旦找到，瀏覽器會立即打開對應網頁，如果沒有找到，則瀏覽器會將網址提交DNS服務器進行IP地址解析。這也是提高快速打開網頁的方法!
Hosts文件位置在哪里?
1、Windows XP/2003/Vista/2008/7/8/8.1/10用戶Hosts文件是在：C:\Windows\System32\drivers\etc
2、也可Win+R后輸入：C:\Windows\System32\drivers\etc
Hosts文件修復：
1、將hosts文件復制到桌面，用記事本打開；
2、刪除記事本的全部內容，將以下內容復制后放入文件然后保存：
# copyright (c) 1993-1999 microsoft corp.
#
# this is a sample hosts file used by microsoft tcp/ip for windows.
# this file contains the mappings of ip addresses to host names. each
# entry should be kept on an individual line. the ip address should
# be placed in the first column followed by the corresponding host name.
# the ip address and the host name should be separated by at least one
# space.
#
# additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# for example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
127.0.0.1 localhost
3、將修改后的hosts文件放入C:\Windows\System32\drivers\etc替換以前的hosts文件，修復成功!