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！当用户使用网址时（如浏览器输入，dos窗口输入，实际配置使用），系统会首先自动从Hosts文件中寻找对应的IP地址，一旦找到，系统会优先使用对应IP地址；如果没有找到，则会将网址提交DNS服务器进行IP地址解析。当用浏览器使用时，可以提高快速打开网页的方法！
hosts此文件的相应路径：
C:\Windows\System32\drivers\etc\hosts
hosts文件内容（当自己的hosts文件损坏时，可复制此内容放入hosts文件中即可）
# Copyright (c) 1993-2009 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
#
# 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
# localhost name resolution is handled within DNS itself.
# 127.0.0.1 localhost
# ::1 localhost
# 127.0.0.1 localhost
# ::1 localhost
127.0.0.1 localhost
hosts文件修改方法
hosts是系统类文件，所以设置了一定的权限，当准备修改文件时可以用以下方法修改。
使用管理员权限打开“记事本”来进行host文件编辑
在开始菜单---》附件---》记事本---》右键点击---》已管理员身份运行
打开记事本后，选择文件---》打开---》找到目录文件---》打开文件---》修改后保存即可
文件中是以（IP 域名）形式映射的，具体可参考文件中示例。
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