问题集；电脑连接网络之后有些网页无法访问问题

        明明已经连接了互联网，检查一遍也没有什么关系，使用测试软件检测也检测不出来，测速也并没有影响，但是就是打不开一些网页，我之前是打不开csdn、4399等，有时候还加载不出来图片。

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解决方法：因为之前在安装tensorflow的时候似乎有修改了一下本机的hosts文件，所以我将其重置之后似乎就好了（如果没有变化效果，试试重启电脑！）

路径：C:\Windows\System32\drivers\etc

 注意：建议将原文件进行拷贝，保存副本。

重置方法：

1、将#172.13.2.176 2200.TEST.COM

         #172.13.2.176 2201.TEST.COM·····删除（#     ::1      localhost  下边全删掉。）

2、复制下方代码替换电脑内代码（都是差不多了，就是给你复制用的）

# 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
 
# localhost name resolution is handled within DNS itself.
# 127.0.0.1       localhost
# ::1             localhost