Vue安装时报错Failed to download repo vuejs-templates/webpack: connect ETIMEDOUT 192.30.255.112:443

1.打开终端（cmd），输入命令：ping 192.30.255.112 发现连接超时（这个地址是你报错时显示的地址）；输入命令：ping github.com 显示超时。
2.打开地址：C:\Windows\System32\drivers\etc ，然后打开 hosts文件，查看是否为默认配置。如果不是默认配置，修改成默认配置。默认配置如下：

# 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.
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