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performance - What is the purpose of the EBP frame pointer register?

I'm a beginner in assembly language and have noticed that the x86 code emitted by compilers usually keeps the ... a bad idea even in optimized/release builds? Question&Answers:os...

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

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c++ - Why aren't pointers initialized with NULL by default?

Can someone please explain why pointers aren't initialized to NULL? Example: void test(){ char *buf; ... specially pointers addressing the trash on the memory? Question&Answers:os...

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

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298 views

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node.js - MongoDB atomic "findOrCreate": findOne, insert if nonexistent, but do not update

as the title says, I want to perform a find (one) for a document, by _id, and if doesn't exist, have ... everyone is talking about, it's all so confuzzling :( Question&Answers:os...

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

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Java String remove all non numeric characters but keep the decimal separator

Trying to remove all letters and characters that are not 0-9 and a period. I'm using Character.isDigit() but ... decimal, how can I also keep the decimal? Question&Answers:os...

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

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php - How to store values from foreach loop into an array?

Need to store values from foreach loop into an array, need help doing that. The code below does not work, ... $items = array($username); } print_r($items); Question&Answers:os...

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

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python - How to split elements of a list?

I have a list: my_list = ['element10238.94', 'element22.3904', 'element30139847'] How can I delete the and ... result: ['element1', 'element2', 'element3'] Question&Answers:os...

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

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java - Reusing a PreparedStatement multiple times

in the case of using PreparedStatement with a single common connection without any pool, can I recreate an instance ... , can you give me some advice? thanks Question&Answers:os...

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

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html - :after and :before css pseudo elements hack for IE 7

I am using :after and :before css pseudo elements and it is working fine in IE8, and all modern browsers but ... there known hacks to work around this in IE7? Question&Answers:os...

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

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c - Is unsigned integer subtraction defined behavior?

I have come across code from someone who appears to believe there is a problem subtracting an unsigned integer from another ... is right? Is it defined at all? Question&Answers:os...

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

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dom - How do I check if an element is really visible with JavaScript?

This question already has answers here: Question&Answers:os...

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

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python - Reading from a frequently updated file

I'm currently writing a program in python on a Linux system. The objective is to read a log file and execute a ... have a look at these for a nicer solution. Question&Answers:os...

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

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javascript - Why `null >= 0 && null <= 0` but not `null == 0`?

I had to write a routine that increments the value of a variable by 1 if its type is number and assigns 0 to ... null like 0, although it is not actually 0? Question&Answers:os...

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

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java.io.Console support in Eclipse IDE

I use the Eclipse IDE to develop, compile, and run my Java projects. Today, I'm trying to use the ... run on a command-line environment external to Eclipse. Question&Answers:os...

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

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mysql - Location of my.cnf file on macOS

I'm trying to follow along this tutorial to enable remote access to MySQL. The problem is, where should my.cnf file be located? I'm using Mac OS X Lion. Question&Answers:os...

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

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android - Error:Cannot fit requested classes in a single dex file.Try supplying a main-dex list. # methods: 72477 > 65536

I want to add fused location services but it shows me some error. Help me. apply plugin: 'com.android. ... apply plugin: 'com.google.gms.google-services' Question&Answers:os...

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

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javascript - Remove not alphanumeric characters from string

I want to convert the following string to the provided output. Input: "\test edobfred ew" Output: "testredbobfrednew" ... , ''); Output 1: "testredbobfrednew" Question&Answers:os...

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

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Efficient JPEG Image Resizing in PHP

What's the most efficient way to resize large images in PHP? I'm currently using the GD function ... the memory imagedestroy($tmpimg); imagedestroy($img); Question&Answers:os...

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

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273 views

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dictionary - Python - List of unique dictionaries

Let's say I got a list of dictionaries: [ {'id': 1, 'name': 'john', 'age': 34}, {'id': 1, ' ... help me with the most efficient way to achieve this in Python? Question&Answers:os...

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

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427 views

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Reading an Excel file in python using pandas

I am trying to read an excel file this way : newFile = pd.ExcelFile(PATHFileName.xlsx) ParsedData = pd.io. ... there any other way to do this using pandas? Question&Answers:os...

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

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javascript - Get the value of checked checkbox?

So I've got code that looks like this: <input class="messageCheckbox" type="checkbox" value="3" name="mailId[]" ... To add, there will only be ONE checked box. Question&Answers:os...

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

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257 views

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string - Convert character to ASCII numeric value in java

I have String name = "admin"; then I do String charValue = name.substring(0,1); //charValue="a" I want to convert ... value (97), how can I do this in java? Question&Answers:os...

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

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graphics - How to read the RGB value of a given pixel in Python?

If I open an image with open("image.jpg"), how can I get the RGB values of a pixel assuming I have ... if I didn't have to download any additional libraries. Question&Answers:os...

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

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regex - What regular expression will match valid international phone numbers?

I need to determine whether a phone number is valid before attempting to dial it. The phone call ... expression will match valid international phone numbers? Question&Answers:os...

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

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312 views

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node.js - Why does npm install say I have unmet dependencies?

I have a node package. When I run npm install from the package root, it installs a bunch of things, but ... like this, and how can I resolve the dependencies? Question&Answers:os...

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

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350 views

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javascript - AJAX Mailchimp signup form integration

Is there any way to integrate mailchimp simple (one email input) with AJAX, so there is no page refresh ... jQuery Ajax POST not working with MailChimp Thanks Question&Answers:os...

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

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90 views

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ios - What does ENABLE_BITCODE do in xcode 7?

I have a problem with the embedded bitcode term. What is embedded bitcode? When to enable, ENABLE_BITCODE in ... binary when enabled, ENABLE_BITCODE in Xcode 7? Question&Answers:os...

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

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90 views

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Custom events in jQuery?

I'm looking for some input on how to implement custom eventhandling in jquery the best way. I know how to hook ... think is the best way/plugin to handle this? Question&Answers:os...

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

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137 views

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c# - ASP.NET MVC Conditional validation

How to use data annotations to do a conditional validation on model? For example, lets say we have the following ... in ASP.NET MVC 2 with data annotations? Question&Answers:os...

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

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