小编Lir*_*roy的帖子

在React JSX中是否有一个商定的缩进约定？2个空格,4个标签等

刚刚将我的系统更新为El Capitan,当启动rails服务器(在Yosemite上完美运行)时,我收到以下警告.

Ignoring bcrypt-3.1.10 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.10
Ignoring bcrypt-ruby-3.1.2 because its extensions are not built.  Try: gem pristine bcrypt-ruby --version 3.1.2
Ignoring bcrypt-ruby-3.0.1 because its extensions are not built.  Try: gem pristine bcrypt-ruby --version 3.0.1
Ignoring binding_of_caller-0.7.2 because its extensions are not built.  Try: gem pristine binding_of_caller --version 0.7.2
Warning: Running `gem pristine --all` to regenerate your installed gemspecs (and deleting then reinstalling your bundle if you use bundle --path) will …

&&=以下方法意味着什么？

records.each do |record|
  raise_on_type_mismatch!(record)
  add_to_target(record) do |rec|
    result &&= insert_record(rec, true, should_raise) unless owner.
      new_record?
  end
end

以下代码用于ajax加载div.

我唯一的问题是.html()渲染原始 html,所以我认为用纯JS替换它可能是一个好主意,这样我的视图就可以清除任何转义的原始html.

我很想听听你对此的看法.

$(document).ready(function() {
      $('.ajax_load').each(function(index, element) {
        var url = $(element).data('remote-url')
        if (url) {
          $.get(url, function(responseText) {
            $(element).html(responseText);
          })
        } else {
          console.log("missing url for ajax!")
        }
      })
    })

!!以下方法意味着什么？

def include?(record)
  !!@association.include?(record)
end

<<-在以下方法/上下文中意味着什么？

class_eval <<-RUBY, __FILE__, __LINE__ + 1
def destroy_associations
  association(:#{middle_reflection.name}).delete_all(:delete_all)
  association(:#{name}).reset
  super
end
RUBY

以下示例之间有什么区别吗？

例1:

(function (window) {
 'use strict';
  console.log(window)
})(window);

例2:

(function () {
 'use strict';
  console.log(window)
})();

传递窗口对象是否可选？

我有一个像这样的控制器方法:

def index
  @categories = Category.all
end

如何@categories按字母顺序订购名称？

存储键值对哪个更好？

数组:

class A
  DEFAULTS = [ONE = 1, TWO = 2]
end

或哈希:

class A
  DEFAULTS = {'ONE' => 1, 'TWO' => 2 }
end