小编Ter*_*hen的帖子

我在Node.js应用程序中看到了一段JavaScript代码.

( function() { console.log("gg") } )(this)

我想知道为什么使用=>(function(){})(this)这种类型的结构,以及如何编译.

我理解为什么我们有这两个方括号()(),以及为什么这个代码可以工作.

我是Heroku的新手.我按照Heroku网站上的教程在Windows中设置Heroku.我安装了Heroku Toolbelt.当我运行该命令$ heroku login,并输入电子邮件和密码时,我收到以下错误:

Owner@OWNER-PC ~
$ heroku login
Enter your Heroku credentials.
Email: qwe
Password (typing will be hidden):
 !    Heroku client internal error.
 !    Search for help at: https://help.heroku.com
 !    Or report a bug at: https://github.com/heroku/heroku/issues/new

Error:       Unable to verify certificate, please set `Excon.defaults[:ssl_ca_path] = path_to_certs`, `Excon.defaults[:ssl_ca_file] = path_to_file`, or `Excon.defaults[:ssl_verify_peer] = false` (less secure). (Excon::Errors::SocketError)
Backtrace:   C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/ssl_socket.rb:55:in `connect'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/ssl_socket.rb:55:in `initialize'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/connection.rb:367:in `new'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/connection.rb:367:in `socket'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/connection.rb:105:in `request_call'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/middlewares/mock.rb:42:in `request_call'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/middlewares/instrumentor.rb:22:in `request_call'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/middlewares/base.rb:15:in `request_call'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/middlewares/base.rb:15:in `request_call'
             C:/Users/Owner/.heroku/client/vendor/gems/excon-0.22.1/lib/excon/connection.rb:246:in …