(1) c:\windows\system32\drivers\etc，找到 hosts 这个文件，右键单击，用记事本打开。
(2) 添加下面蓝色部分。
# 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
203.208.39.104 www.youtube.com
203.208.33.100 gdata.youtube.com
203.208.39.99 upload.youtube.com (3) 将文件保存 。关闭所有浏览器，重起浏览器
后即可访问 youtube
