如果两个用户在完全相同的时间从同一内部网络上的两个终端设备(例如,同一办公室共享互联网链接)将同一个文件上传到 IPFS,这两个文件的 CID 是否不同?如果 CID 不同,那么有什么不同呢?
我的 React Native 0.61.5 使用react-navigation 5.1. 这是根导航代码:
const BTab = createBottomTabNavigator();
const Stack = createStackNavigator();
export default function App() {
//const Appscreen = () => (<AppScreen data={data}/>);
return (
<NavigationContainer>
<Stack.Navigator InitialRouteName="Splash">
<Stack.Screen name="Splash" component={SplashScreen}}/>
<Stack.Screen name="App" component={AppScreen} } />
</Stack.Navigator>
</NavigationContainer>
);
}
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该组件AppScreen返回一个如下所示的堆栈:
return (
<NavigationContainer independent={true}>
<BTab.Navigator>
<BTab.Screen name="Event" component={Eventstack} />
<BTab.Screen name="Group" component={Groupstack} />
<BTab.Screen name="Contact" component={Contactstack} />
</BTab.Navigator>
</NavigationContainer>
);
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我注意到屏幕上有双标题:
如何删除App标题并只保留Group?
这是在 RN0.62.2和 Nodejs上的新安装12.18.0。在yarn添加react-native-keychain后,npx react-native run-android的app启动失败,报错:
error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup. Run CLI with --verbose flag for more details.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081
C:\D\code\js\xyz_app\node_modules\react-native-keychain\android\src\main\java\com\oblador\keychain\DeviceAvailability.java:30: error: cannot find symbol
return context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_FACE);
^
symbol: variable FEATURE_FACE
location: class PackageManager
C:\D\code\js\xyz_app\node_modules\react-native-keychain\android\src\main\java\com\oblador\keychain\DeviceAvailability.java:34: error: cannot find symbol
return context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_IRIS);
^
symbol: variable FEATURE_IRIS
location: class PackageManager
2 errors
FAILURE: Build failed with an exception.
What went wrong:
Execution …Run Code Online (Sandbox Code Playgroud) 我正在使用 React Native 0.68 app/MacOS 10.15 进行第一次验证,这是验证中抛出的错误。
App Store Connect Operation Error
Invalid Bundle. iPad Multitasking support requires these orientations: 'UIInterfaceOrientationPortrait,UIInterfaceOrientationPortraitUpsideDown,UIInterfaceOrientationLandscapeLeft,UIInterfaceOrientationLandscapeRight'. Found 'UIInterfaceOrientationPortrait,UIInterfaceOrientationLandscapeLeft,UIInterfaceOrientationLandscapeRight' in bundle 'com.mydomain.xyz.app6'.
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这里有什么问题吗?
我正在测试 React Native 0.68.2/jest 29.0 的组件视图Home。简单的测试用例是从 jest doc 复制的:
import React from 'react';\nimport { NavigationContainer } from '@react-navigation/native';\nimport { render, cleanup, screen, fireEvent } from "@testing-library/react-native";\nimport App from '../App';\n\ndescribe ('App ', () => {\n //afterEach(cleanup);\n test ('shall stack screens', async () => {\n const component = (<NavigationContainer>\n <App />\n </NavigationContainer>);\n const {getByText} = render(component);\n\n await waitFor(() => getByText('AppSplash'));\n \n\n })\n})\nRun Code Online (Sandbox Code Playgroud)\n这是 App.js:
\n import React, {useState, useContext, Component} from 'react';\n import { NavigationContainer } from '@react-navigation/native';\n …Run Code Online (Sandbox Code Playgroud) 以下link_to_function有效:
<%= link_to_function "click", "alert(Hallo world!" %>
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但是,使用jquery,以下方法不起作用:
<%= link_to_function "click", "$('#std').append('<p>my friend!</p>')" %>
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在application.html.erb中,有:
<head>
<title><%= title %></title>
<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>
<%= stylesheet_link_tag "application" %>
<%= javascript_include_tag "application" %>
<%= csrf_meta_tags %>
</head>
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jquery似乎运作良好.有关这个问题的任何想法?谢谢.
另外这里是rails 3.1.3中关于link_to_function的api定义:
link_to_function(name, function, html_options={})
Returns a link whose onclick handler triggers the passed JavaScript.
The helper receives a name, JavaScript code, and an optional hash of HTML options. The name is used as the link text and the JavaScript code goes into the …Run Code Online (Sandbox Code Playgroud) 在我们针对rails 3.1.0 app的rspec测试中,我们使用Factory.build和Factory.attributes_for.我们发现如果我们将Factory.build更改为Factory.attributes_for,则一个数据验证失败.此外,Factory.attributes_for没有正确测试它.我想知道这两者之间有什么区别,以及如何在rspec中使用它们.
在我们的模型测试中,我们使用的是Factory.build.在控制器测试更新或新的,我们使用Factory.attributes_for.我们刚刚在控制器测试中发现了一个案例,即Factory.attributes_for没有正确测试它并且使用Factory.build通过模型验证的情况失败了.
非常感谢.
更新:这是rfq模型中的rspec案例:
it "should not have nil in report_language if need_report is true" do
rfq = Factory.build(:rfq, :need_report => true, :report_language => nil)
rfq.should_not be_valid
end
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这是rfq控制器中的一个rspec案例:
it "should be successful for corp head" do
session[:corp_head] = true
session[:user_id] = 1
s = Factory(:standard)
rfq = Factory.attributes_for(:rfq, :need_report => true, :report_language => 'EN')
rfq[:standard_ids] = [s.id] # attach standard_id's to mimic the POST'ed form data
get 'create', :rfq => rfq
response.should redirect_to URI.escape("/view_handler?index=0&msg=RFQ saved!")
end
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由于验证失败,上述控制器案例失败.控制器情况的失败是由于下面的行添加到控制器rfqs的创建引起的. …
我们有这样的数组项:
items = [[[["2012-09-01", 10], ["2011-09-10", 20]]], [[["2010-01-01", 23]]]]
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如何将4维项目缩减为二维数组,如下所示:
items = [["2012-09-01", 10], ["2011-09-10", 20], ["2010-01-01", 23]]
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非常感谢.
我刚移动到在Win 10 / ruby 2.2.2 / Rails 4.2.0上运行的新笔记本电脑(在以前的Win 8 ruby 2.0.0 / Rails 4.2 / rspec 3.2上没有问题)。现在安装时rspec,下面有一个奇怪的错误:
$ rails g rspec:install
identical .rspec
exist spec
create spec/C:/Users/Jun C/AppData/Local/Temp/d20160219-10996-1x6hu8w/spec/spec_helper.rb
C:/Ruby22-x64/lib/ruby/2.2.0/fileutils.rb:252:in `mkdir': Invalid argument @ dir_s_mkdir - C:/D/code/rails_proj/engines/simple_orderx/spec/C: (Errno::EINVAL)
from C:/Ruby22-x64/lib/ruby/2.2.0/fileutils.rb:252:in `fu_mkdir'
from C:/Ruby22-x64/lib/ruby/2.2.0/fileutils.rb:226:in `block (2 levels) in mkdir_p'
from C:/Ruby22-x64/lib/ruby/2.2.0/fileutils.rb:224:in `reverse_each'
from C:/Ruby22-x64/lib/ruby/2.2.0/fileutils.rb:224:in `block in mkdir_p'
from C:/Ruby22-x64/lib/ruby/2.2.0/fileutils.rb:210:in `each'
from C:/Ruby22-x64/lib/ruby/2.2.0/fileutils.rb:210:in `mkdir_p'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:61:in `block in invoke!'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/thor-0.19.1/lib/thor/actions/empty_directory.rb:116:in `call'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/thor-0.19.1/lib/thor/actions/empty_directory.rb:116:in `invoke_with_conflict_check'
from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/thor-0.19.1/lib/thor/actions/create_file.rb:60:in `invoke!'
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有/spec在Rails应用程序的根。该 …
我需要Puppeteer暂停并等待和的用户输入,username然后password才能继续。这是一个nodejs8.12.0应用程序。
(async () => {
const browser = await puppeteer.launch({headless: false});
const page = await browser.newPage();
await page.goto('https://www.myweb.com/login/');
//code to wait for user to enter username and password, and click `login`
const first_page = await page.content();
//do something
await browser.close();
)}();
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基本上,程序会暂停并等待,直到用户单击login按钮。有可能这样做Puppeteer吗?或者我还能做什么?
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casperjs ×1
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