小编Tra*_*vis的帖子

如何检查客户端计算机上加载的jQuery版本？客户端可能已加载jQuery但我不知道如何检查它.如果它们已加载,我如何检查版本和前缀,例如:

$('.class')
JQuery('.class')

我注意到ZSH中任何cURL请求的返回都以a结尾%,例如:

$ curl http://textbelt.com/text -d number="555555555" -d message="hey"
=> { "success": true }%

为什么要添加此字符,是否有标准的删除方法？

注意:ZSH是我注意到这种情况发生的唯一shell(在bash csh ksh sh tcsh zsh中测试)

我正在尝试设置键绑定来物理移动当前选项卡,无论是在其他选项卡的右侧还是左侧(而不是单击并拖动以重新排列它们).

我知道添加了用户定义的键绑定~/.atom/keymap.cson,我只是在确定命令时遇到问题,因为我没有看到它出现在默认的键绑定中.

因为我想要更新我的OSX到El Capitan哦我的Zsh upgrade_oh_my_zsh我得到以下错误:

Upgrading Oh My Zsh
fatal: Not a git repository (or any of the parent directories): .git
There was an error updating. Try again later?

我从来没有使用过git,在互联网上搜索这个致命的错误,他们建议git init在/.oh-my-zsh文件夹中做.运行此命令后,当我upgrade_oh_my_zsh再次尝试运行时,会发生新的致命错误.

fatal: 'origin' does not appear to be a git repository
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists. 

我不知道它是否与它有任何关系但是当我打开终端(iTerm2)时我也收到了这个通知:

/Users/peter/.zshrc:1: command not found: Path

任何人都有这方面的经验或知道我的问题的解决方案？

当第一个条件为假时,ruby是否会停止评估if语句？我不断地得到undefined method `ready' for nil:NilClass>如song = nil.

    if !song.nil? && song.ready && !song.has_been_downloaded_by(event.author)
      song.send_to_user(event.author)
      nil
    elsif !song.ready
      "The song is not ready yet. Try again once it is."
    elsif song.has_been_downloaded_by(event.author)
      "Yo, check your private messages, I've already sent you the song."
    else
      'Song with such index does not exist.'
    end

我发现在Ruby中使用整数会导致它们的二进制表示形式大于32位时，它们的行为不同于JS。

a = 144419633058839139324
b = 3903086624

JS：

a >> 0; => 1482555392
b >> 0; => -391880672

红宝石：

a >> 0 => 144419633058839139324
[a].pack('V').unpack('V').first => 1482560508
[b].pack('V').unpack('V').first => 3903086624

我的问题是如何转换我的Ruby代码以提供相同的返回值JS？

按照这里的步骤"gem install therubyracer -v'0.10.2"对osx mavericks没有安装,我能够得到therubyracer -v 0.10.2和0.12.0安装好,但不是0.11.4.

gem install therubyracer -v 0.11.4

返回:

Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
    ERROR: Failed to build gem native extension.

    /Users/thooper/.rbenv/versions/2.1.2/bin/ruby -r ./siteconf20150102-7132-9ct9a4.rb extconf.rb
creating Makefile
Compiling v8 for x64
Using python 2.7.9
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Unable to find a compiler officially supported by v8.
It is recommended to use GCC v4.4 or higher
Using compiler: g++
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Unable to find a …

我正在尝试编写自己的转置方法.我想知道不同形式的连接如何影响我的代码.

multi = [[1,3,5],[2,4,6],[7,9,8]]
new = Array.new(multi.length, [])
multi.each do |c|
    c.each_with_index do |x,y|
        new[y] += [x]
    end
end
new #=> [[1, 3, 5], [2, 4, 6], [7, 9, 8]]

multi = [[1,3,5],[2,4,6],[7,9,8]]
new = Array.new(multi.length, [])
multi.each do |c|
    c.each_with_index do |x,y|
        new[y] << x
    end
end
new #=> [[1, 3, 5, 2, 4, 6, 7, 9, 8], [1, 3, 5, 2, 4, 6, 7, 9, 8], [1, 3, 5, 2, 4, 6, 7, 9, 8]]

为什么他们不能以相同的方式工作？

我错误地编写了一个方法,该方法将一个变量赋值给方法调用的返回值,该方法调用在以前未定义时将参数传递给参数.我很想知道这是Ruby中的错误,还是实际的预期行为？

RUBY_VERSION
#=> "2.2.4"

def red(arg)
  arg
end

# this is expected since blue is not defined
blue
NameError: undefined local variable or method 'blue' for main:Object
from (pry):8:in '__pry__'

red(blue)
NameError: undefined local variable or method 'blue' for main:Object
from (pry):4:in '__pry__'

# here's the weird part
blue = red(blue)
#=> nil

blue
#=> nil