小编soj*_*600的帖子

我正在尝试从用户正在查看的页面中提取数据并将该数据发送到扩展程序弹出窗口.我在从当前页面提取信息时遇到了麻烦.在查看Google代码教程后,我设置了清单和内容脚本,如下所示.当我转到具有id ="comments"的跨度的测试页面时,来自注入的内容脚本的变量总是最终为null.谁知道我可能会失踪？谢谢!

manifest.json
=================
{
    "name": "Sample Extension",
    "version": "0.0.1",
    "description": "Sample extension",
    "icons": {"128": "icon.png"},
    "permissions": [
        "tabs", "<all_urls>"
    ],
    "browser_action": {
        "default_icon": "browseraction.png",
        "default_title": "Sample",
        "popup": "popup.html"
    },
    "content_scripts": [
        {
            "matches": ["http://*/*", "<all_urls>" ],
            "js": ["scripts/contentscript.js"]
        }
    ]
}

contentscript.js
===================
var comments = document.getElementById("comments");
alert( comments.innerText );

我正在尝试将Twitter gem版本5.1.1用于我的应用程序,但我遇到了配置问题.我正在运行rails 4和Ruby 2.0.0.在我的Gemfile中,我列出了"gem'twitter'",并通过捆绑包安装了它.根据文档,我在config/initializers/twitter_credentials.rb中创建了一个初始化文件.该文件看起来像这样(虽然我的密钥和秘密充满了来自twitter的信息):

require 'twitter'

client = Twitter::REST::Client.new do |config|
  config.consumer_key        = "YOUR_CONSUMER_KEY"
  config.consumer_secret     = "YOUR_CONSUMER_SECRET"
  config.access_token        = "YOUR_ACCESS_TOKEN"
  config.access_token_secret = "YOUR_ACCESS_SECRET"
end

当我尝试在rails控制台中使用客户端时,这是我收到的错误消息:

2.0.0p353 :001 > client.update("I'm tweeting with @gem!")
NameError: undefined local variable or method `client' for main:Object
from (irb):1
from /Users/user_name/.rvm/gems/ruby-2.0.0-p353/gems/railties-4.0.2/lib/rails/commands/console.rb:90:in `start'
from /Users/user_name/.rvm/gems/ruby-2.0.0-p353/gems/railties-4.0.2/lib/rails/commands/console.rb:9:in `start'
from /Users/user_name/.rvm/gems/ruby-2.0.0-p353/gems/railties-4.0.2/lib/rails/commands.rb:62:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'

知道问题是什么吗？