这样的事情:
gem install rails
Fetching: activesupport-3.0.10.gem (100%)
Fetching: builder-2.1.2.gem (100%)
WARNING: builder-2.1.2 has an invalid nil value for @cert_chain
Fetching: i18n-0.5.0.gem (100%)
Fetching: activemodel-3.0.10.gem (100%)
Fetching: rack-1.2.3.gem (100%)
Fetching: rack-test-0.5.7.gem (100%)
Fetching: rack-mount-0.6.14.gem (100%)
Fetching: tzinfo-0.3.29.gem (100%)
Fetching: abstract-1.0.0.gem (100%)
WARNING: abstract-1.0.0 has an invalid nil value for @cert_chain
Fetching: erubis-2.6.6.gem (100%)
Fetching: actionpack-3.0.10.gem (100%)
Fetching: arel-2.0.10.gem (100%)
Fetching: activerecord-3.0.10.gem (100%)
Fetching: activeresource-3.0.10.gem (100%)
Fetching: mime-types-1.16.gem (100%)
Fetching: polyglot-0.3.2.gem (100%)
Fetching: treetop-1.4.10.gem (100%)
Fetching: mail-2.2.19.gem (100%)
Fetching: actionmailer-3.0.10.gem (100%)
Fetching: …可能重复:
运行comand rake时出现问题
yulong@ubuntu:~/depotnew$ rake db:migrate
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/version.rb:4: warning: already initialized constant MAJOR
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/version.rb:5: warning: already initialized constant MINOR
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/version.rb:6: warning: already initialized constant BUILD
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/version.rb:3: warning: already initialized constant NUMBERS
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/version.rb:9: warning: already initialized constant VERSION
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake.rb:26: warning: already initialized constant RAKEVERSION
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/early_time.rb:17: warning: already initialized constant EARLY
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/alt_system.rb:32: warning: already initialized constant WINDOWS
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/application.rb:28:
warning: already initialized constant DEFAULT_RAKEFILES
WARNING: Possible conflict with Rake extension: String#ext already exists
WARNING: Possible conflict with Rake extension: String#pathmap already exists
/home/yulong/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/task_arguments.rb:73: warning: …<% (1..3).each do %>
<p id="input">
<input type="text" name="somename"/>
<a class="remove" >Remove</a>
</p>
<% end %>
jQuery的:
var $remove=$(".remove")
$remove.click(
function(){
$(this).parent().remove();
alert($remove.length);
})
它总是警告3,为什么？我remove是否正确删除了课程？