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r - Advantages of reactive vs. observe vs. observeEvent

I've reading everything I can about shiny reactive programming. I'm a bit confused. The following all work but what ... = ui, server = server) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Authenticating with OAuth2 for an app *and* a website

I'm developing a website that is primarily accessed via an app, and I want to use OAuth2 for user registration ... value of the access token. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - How to invoke iPhone Maps for Directions with Current Location as Start Address

I know it's possible to start the iPhone maps application by calling openURL on a google maps URL with ... bookmark in place of myLatLong. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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objective c - What does Apple mean when they say that a NSManagedObjectContext is owned by the thread or queue that created it?

It seems that in November, Apple updated both the NSManagedObjectContext Class Reference and the Core Data Programming ... What am I missing? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How can I toggle word wrap in Visual Studio?

Does Visual Studio .NET have a way to toggle word-wrap on and off? I am used to this feature in Eclipse ... alpha-of-eclipse-word-wrap-released/ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bash - How to check if a symlink exists

I'm trying to check if a symlink exists in bash. Here's what I've tried. mda=/usr/mda if [ ! -L $mda ] ... '!' is there, it triggers every time. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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api - Java: bounded wildcards or bounded type parameter?

Recently, I read this article: http://download.oracle.com/javase/tutorial/extra/generics/wildcards.html My question is ... useful in this case? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby on rails - Cannot install pg gem in Mavericks with Postgres.app

I am trying to install the pg gem for use with Postgres.app on my local machine. I am running Mavericks. ... help you can offer. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How can I inspect disappearing element in a browser?

How can I inspect an element which disappears when my mouse moves away? I don't know it's ID, class ... Variables I saw some useful directions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Failed to find 'ANDROID_HOME' environment variable

I am trying to build an ionic-android project and i have android sdk installed. The name of my project is ... How can i build this project? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Android add placeholder text to EditText

How can I add a placeholder text to EditText in the class that isn't in the XML? I have the following ... EditText name = new EditText(this); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is the difference between Java RMI and RPC?

What is the actual difference between Java RMI and RPC? I have read in some places that RMI uses Objects? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - How to style the divider between Ice Cream Sandwich tabs?

I'm using the following style together with a set of nine patch images to create a red line at the bottom of some ... a blank line next to it: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How do I list all the columns in a table?

For the various popular database systems, how do you list all the columns in a table? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Why do you need to create a cursor when querying a sqlite database?

I'm completely new to Python's sqlite3 module (and SQL in general for that matter), and this just ... just use the connection object? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is the difference between cout, cerr, clog of iostream header in c++? When to use which one?

I tried researching the difference between cout, cerr and clog on the internet but couldn't find a perfect answer. I ... each one's exact use. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is scope/named_scope in rails?

I've recently started an internship. My employer uses ruby on rails, and I frequently encounter new syntax that I ... scope) in ruby on rails? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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In Python NumPy what is a dimension and axis?

I am coding with Pythons NumPy module. If coordinates of a point in 3D space are described as [1, ... ://wiki.scipy.org/Tentative_NumPy_Tutorial See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby - gem eventmachine fatal error: 'openssl/ssl.h' file not found

Just installed El Capitan and can't install gem eventmachine 1.0.7. openssl is at 1.0.2a-1. Tried to use - ... Error 1 make failed, exit code 2 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Clojure differences between Ref, Var, Agent, Atom, with examples

I'm very new to Clojure, Can you guys give me explanation with real world scenarios. I mean, where to ... t understand the real world examples. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Java serialization: readObject() vs. readResolve()

The book Effective Java and other sources provide a pretty good explanation on how and when to use the readObject ... some light on this matter. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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254 views

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Using Grunt, Bower, Gulp, NPM with Visual Studio 2015 for a ASP.NET 4.5 Project

Visual Studio 2015 comes with built in support for tools like Grunt, Bower, Gulp and NPM for ASP.NET 5 projects ... in support for these tools. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to write a crawler?

I have had thoughts of trying to write a simple crawler that might crawl and produce a list of its findings for our ... what it finds, etc,etc. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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349 views

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ios - Updating to latest version of CocoaPods?

I'm having some issues installing Alamofire 4.0 into my project. I've got the latest version of Xcode, running ... sound like some other issue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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push notification - Basic Steps for Using MQTT in android

I am new to Android and want to use MQTT as push notifier for Android from Server. i have read about MQTT but ... ) plz help me in this regard See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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272 views

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sql server - How to export all data from table to an insertable sql format?

I have a Table (call it A_table) in a database (call it A_db) in Microsoft SQL Server Management Studio, and ... any other option to do that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - NavigationBar bar, tint, and title text color in iOS 8

The background text in the status bar is still black. How do I change the color to white? // ... : UIColor.orangeColor()] } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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How to check if an array field contains a unique value or another array in MongoDB?

I am using mongodb now. I have a blogpost collection, and it has a tags field which is an array, e.g. blogpost1. ... any of ['tag3', 'tag4'] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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