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c# - String concatenation vs String Builder. Performance

I have a situation where I need to concatenate several string to form an id of a class. Basically I'm ... > 4) ConcatWithStringBuilder(myList); See Question&Answers more detail:os...

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

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floating point - Why does modulus operator return fractional number in javascript?

Why does 49.90 % 0.10 in JavaScript return 0.09999999999999581? I expected it to be 0. See Question&Answers more detail:os...

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

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Specify an SVG as a background image and ALSO style the SVG in CSS?

Is it possible to specify an SVG as a background image and ALSO style the SVG in the same CSS file? I' ... .svg-pathclass is this possible? See Question&Answers more detail:os...

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

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r markdown - For loop over dygraph does not work in R

There is some strange behavior on dygraph. When using a for loop for dygraph i get no result. library(dygraphs) ... rmarkdown_0.6.1 digest_0.6.8 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 convert <select> dropdown into an unordered list using jquery?

How do I convert a dropdown in this format: <select id="yearfilter" name="yearfilter"> <option value="">All years< ... /li> </ul> using jquery?? 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 spoof http referer

As of current, are there still any methods to spoof HTTP referer? See Question&Answers more detail:os...

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

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php - Class 'COM' not found

I've been trying to open a word document in my script, but I get receiving the same error. Fatal error: ... and a linux based web hosting. 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 - Android coding with switch (String)

I'm developing an android app on eclipse, when I try some code like switch(String){ ...... } it give me the following ... else if(){} ........ See Question&Answers more detail:os...

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

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file - PHP move_uploaded_file() error?

I using following code and it is successfully uploading files on my local machine. It is showing "Successfully ... display to the user ? 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 - Split dataframe into relatively even chunks according to length

I have to create a function which would split provided dataframe into chunks of needed size. For instance if dataframe ... ))], axis = 1) 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 do I merge multiple .net assemblies into a single assembly?

I have a .net application with about 10 assemblies. It would be nice to have them all together as a single ... a jar file for Java applications. See Question&Answers more detail:os...

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

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c# - Converting newtonsoft code to System.Text.Json in .net core 3. what's equivalent of JObject.Parse and JsonProperty

I am converting my newtonsoft implementation to new JSON library in .net core 3.0. I have the following ... the equivalent of Formating.None. See Question&Answers more detail:os...

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

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r - subsetting a data.table using !=<some non-NA> excludes NA too

I have a data.table with a column that has NAs. I want to drop rows where that column takes a particular value (which ... ; d a 1 1 NA <NA> See Question&Answers more detail:os...

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

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c - getch is deprecated

Somewhere back in time I did some C and C++ in college, but I didn't get to many attention to C++. Now I ... key hit. Can you help me with 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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php - Removing last comma from a foreach loop

Im using a foreach loop to echo out some values from my database and seperating each of them by commas but I dont ... in advance for any help :) See Question&Answers more detail:os...

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

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c# - Resolve assembly references from another folder

I am developing an application which references and uses some third party assemblies from a certain Vendor; in development ... return null; } } See Question&Answers more detail:os...

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

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68 views

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Setting the port for node.js server on Heroku

I launched a node.js server with the following line to set the port: app.set('port', process.env.PORT || ... change it? heroku config PORT: 8080 See Question&Answers more detail:os...

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

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reactjs - How do I convert a string to jsx?

How would I take a string, and convert it to jsx? For example, if I bring in a string from a textarea, how ... on the client? Is it possible? 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 - JSchException: Algorithm negotiation fail

I am trying to connect to remote sftp server over ssh with JSch (0.1.44-1) but during session.connect(); I ... Connected to xx.xx.xx.xx. sftp> 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: Find DIV's line-height, not CSS property but actual line-height

Let's say I have a DIV: <div></div> and I want to find out with JS what its line-height is. I ... the line-height of an element with JavaScript? See Question&Answers more detail:os...

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

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264 views

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python - Directory transfers with Paramiko

How do you use Paramiko to transfer complete directories? I'm trying to use: sftp.put("/Folder1","/Folder2") ... : [Errno 21] Is a directory 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 - Schrödinger's variable: the __class__ cell magically appears if you're checking for its presence?

There's a surprise here: >>> class B: ... print(locals()) ... def foo(self): ... print(locals()) ... closure reference here if it isn't needed? See Question&Answers more detail:os...

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

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x86 - Why can't you set the instruction pointer directly?

The Wikipedia article about x86 assembly says that "the IP register cannot be accessed by the programmer ... are the technical restrictions? See Question&Answers more detail:os...

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

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232 views

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javascript - Why not always use the index as the key in a vue.js for loop?

I have used vue.js for a couple of projects and I have been using the index as the key in the for loops <div v- ... items" :key="item.ID"></div> See Question&Answers more detail:os...

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

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223 views

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Special characters in PHP / MySQL

I have in the database words that include special character (in Spanish mostly, like tildes). In the database ... suggestions??? 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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139 views

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python - What's the difference between "update" and "update_idletasks"?

From the effbot.org documentation, we have the following about the update function: Processes all pending events ... are also appreciated. See Question&Answers more detail:os...

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

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343 views

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Convert jpg image to gif, png & bmp format using PHP

How can I convert a single jpg image into 3 different image format gif , png and bmp using PHP? Pls help See Question&Answers more detail:os...

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

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872 views

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javascript - Why is document.execCommand("paste") not working in Google Chrome?

I have a problem with my extension. I want to paste data from the clipboard. So far, I've got this: function ... know what to do. Any ideas? See Question&Answers more detail:os...

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

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