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397 views

1 answer

http - 为什么在http.HandleFunc的回调中使用指针(Why are pointers used in the callback of http.HandleFunc)

I'm trying to learn go for web programming. (我正在尝试学习网络编程 )I came across the http.HandleFunc function , to which i could ... 他们要使用指针而不是常规值 ) ask by Alan Lal translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

500 views

1 answer

mysql - INNER JOIN，LEFT JOIN，RIGHT JOIN和FULL JOIN有什么区别？ [重复](What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN? [duplicate])

This question already has an answer here: (这个问题已经在这里有了答案：) What is the difference between INNER JOIN and OUTER ... RIGHT JOIN和FULL JOIN什么区别？) ask by Lion King translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

436 views

1 answer

scala - SBT编译的软件包在Scala REPL中无法正常工作(SBT-compiled package not working properly in Scala REPL)

I'm developing a Scala package using an sbt project scheme through IntelliJ. (我正在通过IntelliJ使用sbt项目方案开发Scala软件包 )I wanted to ... ClassOne(1.0)可以正常工作 ) ask by zack translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

256 views

1 answer

javascript - 将数组转换为JSON(Convert array to JSON)

I have an Array var cars = [2,3,..] which holds a few integers. (我有一个数组var cars = [2,3,..] ，其中包含一些整数 )I've ... for sending? (如何将其转换为JSON对象进行发送？) ask by dotty translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

327 views

1 answer

node.js - package.json中的tilde（?）和caret（^）有什么区别？(What's the difference between tilde(~) and caret(^) in package.json?)

After I upgraded to latest stable node and npm , I tried npm install moment --save . (升级到最新的稳定node和npm ，我尝试了npm install ... ? (与其他相比有什么优势？) ask by Fizer Khan translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

111 views

1 answer

html - CSS中断表并重复第一列(CSS break table and repeat first column)

I am modifying a website that currently uses a <table> for a price list. (我正在修改当前使用<table>作为价目表的网站 ) Because tables ... (如果是这样，我将如何实现？) ask by Peter Morris translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

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575 views

1 answer

php - 如何在PHP中将日期转换为时间戳？(How to convert date to timestamp in PHP?)

我如何获得例如22-09-2008时间戳？ ask by Wizard4U translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

480 views

1 answer

sql - 我应该在T-SQL中使用！=或<>表示不相等吗？(Should I use != or <> for not equal in T-SQL?)

I have seen SQL that uses both != and <> for not equal . (我见过使用!=和<>表示不相等的 SQL )What is the preferred syntax ... ，因为<>我想起了Visual Basic ) ask by Bob The Janitor translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

550 views

1 answer

regex - 正则表达式中的非捕获组是什么？(What is a non-capturing group in regular expressions?)

非捕获组（即(?:) ）如何在正则表达式中使用，它们有什么用？ ask by never_had_a_name translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

356 views

1 answer

javascript - 在HTML5 localStorage中存储对象(Storing Objects in HTML5 localStorage)

I'd like to store a JavaScript object in HTML5 localStorage , but my object is apparently being converted to a string. (我 ... 案可能仍然很有趣 ) ask by Kristopher Johnson translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

347 views

1 answer

node.js - npm WARN package.json：没有存储库字段(npm WARN package.json: No repository field)

I installed Express.js with the following command: (我使用以下命令安装了Express.js：) sudo npm install -g express I get the following ... worried? (我应该担心吗？) ask by JR Galia translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

292 views

1 answer

c# - 在C＃中检查对象是否为空(Checking if an object is null in C#)

I would like to prevent further processing on an object if it is null. (如果对象为null，我想防止对其进行进一步处理 ) In ... 该对象进行进一步处理以避免NullReferenceException）？) ask by developer translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

546 views

1 answer

javascript - 我需要什么CSS来编码切换按钮？ [关闭](What CSS do I need to code a toggle button? [closed])

Closed) . 已关闭) ) This question needs to be more focused . 这个问题需要更加集中 ) It is not currently accepting answers. 它当前不 ... 的是，我不知道如何使用CSS编写代码 ) ask by GlitchingGang translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

225 views

1 answer

python - 如何计算下降点数？(How to count number of decreasing point?)

I want to count how many large decreasing point before the last point. (我想计算最后一点之前有多少个大的下降点 ) Let say I have this dataframe ... 一个点，该点在最后一点之前大大减少 ) ask by lemon93 translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

211 views

1 answer

javascript - 什么是JSONP，为什么创建它？(What is JSONP, and why was it created?)

I understand JSON, but not JSONP. (我了解JSON，但不了解JSONP )Wikipedia's document on JSON is (was) the top search result for JSONP. ... 在对JSONP有了清晰而透彻的描述 ) ask by Cheeso translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

446 views

1 answer

html - 如何在不破坏功能的情况下替换锚标记上的类？(How can I replace class on anchor tag without breaking functionality?)

In the code below I have anchor tag where window and less class are applied. (在下面的代码中，我有anchor tag ，其中应用了window ... .png); display: inline-block; } ask by osama translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

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495 views

1 answer

git - LF将由git中的CRLF替换-那是什么，它很重要吗？ [重复](LF will be replaced by CRLF in git - What is that and is it important? [duplicate])

Possible Duplicate: (可能重复：) git replacing LF with CRLF (git用CRLF替换LF) When I create a new rails application I'm seeing a ... 忽略它并像往常一样继续前进？) ask by LearningRoR translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

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216 views

1 answer

bash - 在Bash中比较数字(Comparing numbers in Bash)

I'm starting to learn about writing scripts for the bash terminal, but I can't work out how to get the comparisons to work ... 换为类型以进行真正的比较？) ask by advert2013 translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

287 views

1 answer

javascript - 如何在JavaScript中检查未定义的变量(How to check a not-defined variable in JavaScript)

I wanted to check whether the variable is defined or not. (我想检查变量是否已定义 )For example, the following throws a not-defined error ... ? (我怎么能抓到这个错误？) ask by Jineesh translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

316 views

1 answer

java - Java泛型实践的挑战[关闭](Challenges for java generics practice [closed])

Closed.) 关闭 )) This question is off-topic . 这个问题是题外话 ) It is not currently accepting answers. 它当前不接受答案 ) Want to improve ... 请在此处写下一些有趣的挑战-非常感谢！) ask by DmitriyS translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

176 views

1 answer

c++ - #include和有什么不一样 <filename> 和#include“文件名”？(What is the difference between #include <filename> and #include “filename”?)

在C和C ++编程语言中，在include语句中使用尖括号和引号有什么区别，如下所示？ #include <filename> #include "filename" ask by quest49 translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

363 views

1 answer

sql - 在单个SQL查询中插入多行？ [重复](Inserting multiple rows in a single SQL query? [duplicate])

This question already has an answer here: (这个问题在这里已有答案：) How do I insert multiple rows WITHOUT repeating the INSERT ... 以在一个SQL statement insert所有4行吗？) ask by translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

467 views

1 answer

html - 出于可访问性的考虑，我们是否应该将字段集标记设置为隐藏？(Should we style a fieldset tag as hidden for accessibility concerns?)

From what I've read in this SO post , the main purposes of the fieldset tag is not logically group other labels and inputs ... (还是根本不使用它？) ask by Duarte Arribas translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

319 views

1 answer

c++ - C ++ Singleton设计模式(C++ Singleton design pattern)

Recently I've bumped into a realization/implementation of the Singleton design pattern for C++. (最近，我碰到了C ++的Singleton设计模式的实 ... 如何以正确的方式实施它？) ask by Artem Barger translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

437 views

1 answer

html - div块内的CSS中心文本（水平和垂直）(CSS center text (horizontally and vertically) inside a div block)

I have a div set to display:block ( 90px height and width ), and I have some text inside. (我将div设置为display:block （ ... ) Any ideas? (有任何想法吗？) ask by Satch3000 translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

220 views

1 answer

node.js - node.js aes decipher.final错误(node.js aes decipher.final error)

Im using the following sample . (我正在使用以下示例 )The problem I have is when decrypting: (我的问题是解密时：) var decrypted = ... with be great. (任何帮助都很棒 ) ask by adviner translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

464 views

1 answer

express - Nodemon无法启动本地服务器？(Nodemon not starting local server?)

I am trying to run my Express project but it won't execute.Following is my package.json file (我正在尝试运行Express项目，但无法执 ... on Port 3000"); }); ask by Pritish Sawant translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

204 views

1 answer

c# - 正确使用'收益率'(Proper use of 'yield return')

The yield keyword is one of those keywords in C# that continues to mystify me, and I've never been confident that I'm ... .ToList<Product>(); } } ask by senfo translate from so...

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

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