这是设置:
新的Rails应用程序,然后将此test_rake.rake放在lib/tasks中:
task :testclass do
HelloClass.hello
end`
把hello_class.rb放在app/models中,或者放在lib /中用这行:config.autoload_paths += %W(#{config.root}/lib)添加到config.rb
class HelloClass
def self.hello
puts 'hello_class'
end
end
rake testclass给出了这个错误:
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2503:in `const_missing'
/Users/name/Sites/Rails/indexapp/lib/tasks/test_class.rake:5:in `block (2 levels) in <top (required)>'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:636:in `block in execute'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:597:in `block in invoke_with_call_chain'
/Users/name/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2029:in `block (2 levels) in top_level'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2029:in `block in top_level'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2001:in `block in run'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/Users/name/.rvm/gems/ruby-1.9.2-p0@global/gems/rake-0.8.7/bin/rake:31:in `<top …我使用jQuery .bind()和.unbind()来处理滚动时的动画事件.
$(window).bind('scroll', function(){
... code ...
if(code_was_successful){
$(window).unbind(e);
}
});
从1.7开始(我使用的是1.11)我们应该使用.on()和.off(),但是.off()似乎不支持解除自身绑定的事件处理程序.对于普通的点击事件等,我必须将处理程序保存到变量并设置另一个事件处理程序来解除绑定(这会破坏目的),而对于滚动事件则不可能,因为.off()需要选择器解除绑定一个特定的处理程序,滚动事件不能有一个.
这样做的现代方法是什么？