Hosts文件的主要作用是可以加快某个域名或网站的解析速度，来达到快速访问某个网站的目的，当然，Hosts文件还可以屏蔽网站，重新定向网站域名等作用，如果用户计算机中的Hosts被改的面目全非，可以看看下文Hosts文件修复方法。
Hosts文件是什么？
Hosts文件主要作用是定义IP地址和主机名的映射关系，是一个映射IP地址和主机名的规定。可以用文本文件打开！当用户在浏览器中输入一个需要登录的网址时，系统会首先自动从Hosts文件中寻找对应的IP地址，一旦找到，浏览器会立即打开对应网页，如果没有找到，则浏览器会将网址提交DNS服务器进行IP地址解析。这也是提高快速打开网页的方法！
Hosts文件位置在哪里？
Windows XP/2003/Vista/2008/7/8/8.1/10用户Hosts文件是在：C:WindowsSystem32driversetc
你可以直接根据上述路径进入，也可Win+R后输入：C:WindowsSystem32driversetc
Hosts文件修复方法：
1、将hosts文件复制到桌面，用记事本打开！
2、删除记事本的全部内容，将以下内容复制后放入文件然后保存：
01# copyright (c) 1993-1999 microsoft corp.02#03# this is a sample hosts file used by microsoft tcp/ip for windows.04# this file contains the mappings of ip addresses to host names. each05# entry should be kept on an individual line. the ip address should06# be placed in the first column followed by the corresponding host name.07# the ip address and the host name should be separated by at least one08# space.09#10# additionally, comments (such as these) may be inserted on individual11# lines or following the machine name denoted by a '#' symbol.12#13# for example:14#15# 102.54.94.97 rhino.acme.com # source server16# 38.25.63.10 x.acme.com # x client host17127.0.0.1 localhost18127.0.0.1 localhost复制代码# 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 host127.0.0.1 localhost127.0.0.1 localhost
3、将修改后的hosts文件放入C:WindowsSystem32driversetc替换以前的hosts文件，修复成功！
以上便步骤便是Hosts文件修复方法，只要将Hosts文件还原到默认状态，就不会有任何问题。