小编slu*_*her的帖子

我有一个textarea和一个按钮.单击该按钮可将文本插入文本区域.

有没有办法允许用户按Ctrl/Cmd + z撤消文本的插入并将textarea恢复到以前的状态？

我有以下文件:

file.rb

require_relative 'foo/bar'
baz = Foo::Stuff::Baz.new
# do stuff

富/ bar.rb

require_relative 'stuff/baz'
module Foo
    class Bar
        def initialize
            # do stuff
        end
    end
end

富/材料/ baz.rb

module Foo
    module Stuff
        class Baz < Bar
        end
    end
end

我收到以下错误:

`':未初始化的常量Foo :: Stuff :: Bar(NameError)

我有什么问题吗？这在Ruby中是否可行？如果它很重要,我只是这样做,因为我需要专门继承initialize方法.

我有以下 Package.swift：

// swift-tools-version:5.2
import PackageDescription

let package = Package(
    name: "my-vapor-project",
    platforms: [
       .macOS(.v10_15)
    ],
    dependencies: [
        //  A server-side Swift web framework.
        .package(url: "https://github.com/vapor/vapor.git", from: "4.0.0-rc"),
        .package(url: "https://github.com/vapor/fluent.git", from: "4.0.0-rc"),
        .package(url: "https://github.com/vapor/fluent-mysql-driver.git", from: "4.0.0-rc"),
        .package(url: "https://github.com/apple/swift-package-manager", .branch("master")),
    ],
    targets: [
        .target(name: "App", dependencies: [
            .product(name: "Fluent", package: "fluent"),
            .product(name: "FluentMySQLDriver", package: "fluent-mysql-driver"),
            .product(name: "Vapor", package: "vapor"),
            .product(name: "SwiftPM", package: "swift-package-manager")
        ]),
        .target(name: "Run", dependencies: ["App"]),
        .testTarget(name: "AppTests", dependencies: [
            .target(name: "App"),
            .product(name: "XCTVapor", package: "vapor"),
        ])
    ]
) …