解决方法：
一、首先打开浏览器，然后单击右上角的小齿轮，在出现的对话框中，选择“Internet选项”以打开设置选项。
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二、然后在弹出的“Internet选项设置”页面中单击“安全”，点击“单击”默认级别“。
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三、把ACTIVE选项下的各个选项都设为启用。
/iknow-pic.cdn.bcebos.com/6a600c338744ebf8409cb2d5d7f9d72a6159a76f"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/6a600c338744ebf8409cb2d5d7f9d72a6159a76f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/6a600c338744ebf8409cb2d5d7f9d72a6159a76f"/>
四、单击“默认级别”后，单击右下角的“应用”。
/iknow-pic.cdn.bcebos.com/023b5bb5c9ea15ce5e0737e3b8003af33b87b26b"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/023b5bb5c9ea15ce5e0737e3b8003af33b87b26b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/023b5bb5c9ea15ce5e0737e3b8003af33b87b26b"/>
五、切换回“高级”选项卡并勾选前两项“禁用脚本调试（InternetExplorer）”和“禁用脚本调试（其他）”。
/iknow-pic.cdn.bcebos.com/838ba61ea8d3fd1f82d275d03e4e251f94ca5f05"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/838ba61ea8d3fd1f82d275d03e4e251f94ca5f05?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/838ba61ea8d3fd1f82d275d03e4e251f94ca5f05"/>
六、完成挂钩后，单击右下角的“应用”，即可。
/iknow-pic.cdn.bcebos.com/6d81800a19d8bc3e0cf7d1208c8ba61ea9d34559"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/6d81800a19d8bc3e0cf7d1208c8ba61ea9d34559?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/6d81800a19d8bc3e0cf7d1208c8ba61ea9d34559"/>
解决方式：
把mysql的gem版本换成0.5.2
再bundle
bundle完之後再改回原本的版本就不影响团队开发。
原则就是可以顺利跑完bundle就好，暂时更改版号骗过bundle
Gemfile
gem "mysql2", "~>0.5.2"
发生问题：
$ sudo gem install mysql2 -v 0.3.21
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
current directory: /Users/huyy01/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/mysql2-0.3.21/ext/mysql2
/Users/huyy01/.rbenv/versions/2.5.1/bin/ruby -r ./siteconf20180724-29825-pksvq0.rb extconf.rb
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
-----
Using mysql_config at /usr/local/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
-----
Setting rpath to /usr/local/Cellar/mysql/8.0.11/lib
-----
creating Makefile
current directory: /Users/huyy01/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/mysql2-0.3.21/ext/mysql2
make "DESTDIR=" clean
current directory: /Users/huyy01/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/mysql2-0.3.21/ext/mysql2
make "DESTDIR="
compiling client.c
client.c:439:3: error: use of undeclared identifier 'my_bool'
my_bool res = mysql_read_query_result(client)
^
client.c:441:19: error: use of undeclared identifier 'res'
return (void *)(res == 0 ? Qtrue : Qfalse)
^
client.c:762:3: error: use of undeclared identifier 'my_bool'
my_bool boolval
^
client.c:793:7: error: use of undeclared identifier 'boolval'
boolval = (value == Qfalse ? 0 : 1)
^
client.c:794:17: error: use of undeclared identifier 'boolval'
retval = &boolval
^
client.c:797:10: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'did you mean 'MYSQL_DEFAULT_AUTH'?
case MYSQL_SECURE_AUTH:
^~~~~~~~~~~~~~~~~
MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.11/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
MYSQL_DEFAULT_AUTH,
^
client.c:798:7: error: use of undeclared identifier 'boolval'
boolval = (value == Qfalse ? 0 : 1)
^
client.c:799:17: error: use of undeclared identifier 'boolval'
retval = &boolval
^
client.c:830:38: error: use of undeclared identifier 'boolval'
wrapper->reconnect_enabled = boolval
^
client.c:1185:38: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'did you mean 'MYSQL_DEFAULT_AUTH'?
return _mysql_client_options(self, MYSQL_SECURE_AUTH, value)
^~~~~~~~~~~~~~~~~
MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.11/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
MYSQL_DEFAULT_AUTH,
^
10 errors generated.
make: *** [client.o] Error 1
make failed, exit code 2
Gem files will remain installed in /Users/huyy01/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/mysql2-0.3.21 for inspection.
Results logged to /Users/huyy01/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/extensions/x86_64-darwin-17/2.5.0-static/mysql2-0.3.21/gem_make.out
sh-huyy01:redmine huyy01$ cd /Users/huyy01/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/
