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html - <meta charset="utf-8"> vs <meta http-equiv="Content-Type">

In order to define charset for HTML5 Doctype, which notation should I use? Short: <meta charset="utf-8" /> Long: ... Type" content="text/html; charset=utf-8" /> Question&Answers:os...

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

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Can I call a constructor from another constructor (do constructor chaining) in C++?

As a C# developer I'm used to running through constructors: class Test { public Test() { DoSomething(); } public ... using the 'this' keyword, but both fail. Question&Answers:os...

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

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How do I install an R package from source?

A friend sent me along this great tutorial on webscraping NYtimes with R. I would really love to try it. However, ... package from source. I'm running Mac OSX. Question&Answers:os...

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

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linux - How to keep environment variables when using sudo

When I use any command with sudo the environment variables are not there. For example after setting HTTP_PROXY the ... says it can't bypass the proxy setting. Question&Answers:os...

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

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How to Get Element By Class in JavaScript?

I want to replace the contents within a html element so I'm using the following function for that: function ... don't want to use jQuery for this. Question&Answers:os...

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

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javascript - What does [object Object] mean?

I am trying to alert a returned value from a function and I get this in the alert: [object Object] Here is ... is the function which I am trying to check on. Question&Answers:os...

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mongoose - Does MongoDB's $in clause guarantee order

When using MongoDB's $in clause, does the order of the returned documents always correspond to the order of the array argument? Question&Answers:os...

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

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java - Semicolon at end of 'if' statement

Today, after half an hour of searching for a bug, I discovered that it is possible to put a semicolon after ... any situation in which this would be useful? Question&Answers:os...

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

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Oracle SQL pivot query

I have data in a table as seen below: MONTH VALUE 1 100 2 200 3 300 4 400 5 500 6 600 I ... MONTH_MAR MONTH_APR MONTH_MAY MONTH_JUN 100 200 300 400 500 600 Question&Answers:os...

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How to find and restore a deleted file in a Git repository

Say I'm in a Git repository. I delete a file and commit that change. I continue working and make some ... copy that file into my original project checkout. Question&Answers:os...

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

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html - Set cellpadding and cellspacing in CSS?

In an HTML table, the cellpadding and cellspacing can be set like this: <table cellspacing="1" cellpadding="1"> How can the same be accomplished using CSS? Question&Answers:os...

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python - How to fix: "UnicodeDecodeError: 'ascii' codec can't decode byte"

as3:~/ngokevin-site# nano content/blog/20140114_test-chinese.mkd as3:~/ngokevin-site# wok Traceback (most ... , Chinese post can be published successfully. Question&Answers:os...

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

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windows - Key hash for Android-Facebook app

I'm working on an Android app, in which I want to integrate a Facebook posting feature. I downloaded the Facebook- ... hash for Android. How do I generate it? Question&Answers:os...

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

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c++ - How can I convert a std::string to int?

Just have a quick question. I've looked around the internet quite a bit and I've found a few solutions but ... for such a small problem though. Any ideas? Question&Answers:os...

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

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jquery - Get the real width and height of an image with JavaScript? (in Safari/Chrome)

I am creating a jQuery plugin. How do I get the real image width and height with Javascript in Safari? The ... like Safari and Google Chrome values are 0. Question&Answers:os...

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

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c# - Creating a blocking Queue<T> in .NET?

I have a scenario where I have multiple threads adding to a queue and multiple threads reading from the same queue ... )); _FullEvent.Reset(); } } } Question&Answers:os...

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

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ios - How to enable native resolution for apps on iPhone 6 and 6 Plus?

Xcode 6 GM now includes simulators for iPhone 6 and 6 Plus, and by default they run apps in a scaled mode. To ... an app actually run in the 6/6+ resolution? Question&Answers:os...

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

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bash - What is the difference between $(command) and `command` in shell programming?

To store the output of a command as a variable in sh/ksh/bash, you can do either var=$(command) or var ... What's the difference if any between the two methods? Question&Answers:os...

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

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Java Swing revalidate() vs repaint()

I'm putting together a Swing application where I often want to replace the contents of a JPanel. To do this, I'm ... if not, when should I call each of them? Question&Answers:os...

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java - What does servletcontext.getRealPath("/") mean and when should I use it

In the following snippet: ServletContext context = request.getServletContext(); String path = context.getRealPath("/"); ... ) represent? When should I use it? Question&Answers:os...

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

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Operator overloading in Java

Please can you tell me if it is possible to overload operators in Java? If it is used anywhere in Java could you please tell me about it. Question&Answers:os...

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

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opengl - Rendering meshes with multiple indices

I have some vertex data. Positions, normals, texture coordinates. I probably loaded it from a .obj file or ... I render this mesh data using OpenGL/Direct3D? Question&Answers:os...

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

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python - Find if 24 hrs have passed between datetimes

I have the following method: # last_updated is a datetime() object, representing the last time this program ran def ... , how can I do that in Python? Question&Answers:os...

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

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python - How to wait some time in pygame?

While I've been using time.wait in my code since I began learning Python and Pygame, I've been wondering ... wait some time besides using these two functions? Question&Answers:os...

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

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c# - How to enumerate an enum

How can you enumerate an enum in C#? E.g. the following code does not compile: public enum Suit { Spades, ... It fails on the Suit keyword, the second one. Question&Answers:os...

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

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python - Set up a scheduled job?

I've been working on a web app using Django, and I'm curious if there is a way to schedule a job to run ... site, but I'm hoping for something a bit cleaner. Question&Answers:os...

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

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Python multiprocessing PicklingError: Can't pickle <type 'function'>

I am sorry that I can't reproduce the error with a simpler example, and my code is too complicated to ... example with this pattern and it works though. Question&Answers:os...

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

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php - How to insert multiple rows from array using CodeIgniter framework?

I'm passing a large dataset into a MySQL table via PHP using insert commands and I'm wondering if it's ... framework so its functions are also available to me. Question&Answers:os...

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

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