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flutter - How do I use Dart extension functions?

Dart 2.6 introduces a new language feature called "static extension members". However, I do not quite understand ... => this.children.length; See Question&Answers more detail:os...

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

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sqlite - SQLITE3 VACUUM, "database or disk is full"

I'm trying to run the VACUUM command on my database, but I seem to run out of space: > sqlite3 mydatabase. ... allow the vacuum command to run? 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 fix python-selenium error "connection refused" when initializing a selenium webdriver?

I am running very complex python-selenium tests on non-public webpages. In most cases these tests run fine, but ... better way to do 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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Decode Base64 to Hexadecimal string with javascript

Needing to convert a Base64 string to Hexadecimal with javascript. Example: var base64Value = "oAAABTUAAg==" Need ... found a lot of questions See Question&Answers more detail:os...

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

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jquery - Limit number of characters in input field

I want to use jquery to limit the number of characters in an editable div (or form input). See Question&Answers more detail:os...

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

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angularjs - Filter by multiple columns with ng-repeat

I'm wondering if there's an easy way in Angular to filter a table using ng-repeat on specific columns using ... rather than the union. 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 to replace html element with ajax response?

How do I replace the html element from ajax response? What I know to is to remove the element, how do ... removed portion with response of ajax? See Question&Answers more detail:os...

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

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checking if at least one radio button has been selected - JavaScript

Supposed I had the following HTML form: <html xmlns="http://www.w3.org/1999/xhtml"> <head><meta http- ... one radio input has been selected? 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 - Write int to text file using Writer

Writer wr = new FileWriter("123.txt"); wr.write(123); wr.close(); Output file contains: { Where is the ... write int to text file using Writer? See Question&Answers more detail:os...

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

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performance - Is optimizing JavaScript for loops really necessary?

I read that it is advised to optimize loops in JavaScript by not reading the length attribute of an array ... Which version would you recommend? See Question&Answers more detail:os...

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

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select - HTML Multiselect Limit

Is it possible to set limit to multipleselect? Below is an example code where user can select more than 1 value. < ... than 3 value. Any idea? See Question&Answers more detail:os...

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

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include - JavaScript: Inline Script with SRC Attribute?

I'm used to including and using JS like so: <script type='text/javascript' src='/path/to/script.js'></ ... know what the official behavior is. 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 - JMenu ActionListener

I was wondering if can you test to see if a JMenu (not JMenuItem) has been clicked. I tried adding an ... this result are welcome too! 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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limiting memory usage in R under linux

We are running R in a linux cluster environment. The head node has had a few hangs when a user has ... may be the only way forward. 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 - OSError 38 [Errno 38] with multiprocessing

I'm having the following error: $ sudo chmod a+rwxt /dev/shm/ $ ls -ld /dev/shm/ drwxrwxrwt 2 root root ... write access to /dev/shm)? 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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nsarray - Array of tuples in Swift

I have a function: func parseJSON3(inputData: NSData) -> NSArray { var tempDict: (id:Int, ccomments:Int, post_date ... call Why? Help please.... 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# - Why can I use a collection initializer with private set access from another class?

Consider the following code: public sealed class Order { public Order() { Items = new List<OrderItem>(); } ... be impossible to set its value. See Question&Answers more detail:os...

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

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css selectors - LESS CSS: abusing the & Operator when nesting?

Less uses the & Operator to enhance the possibilities for nesting. .header { color: black; .navigation { ... Which are possible side-effects? 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 do I select the innermost element?

In jQuery, how would I descend as far as possible into the HTML tree? For simplicity, I only have one ... knowing these names? Thanks much! 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.app.Application cannot be instantiated due to NullPointerException

I'm kind of a noob in the android world, and doing a pet project for exercising. It's a very simple ... .permission.VIBRATE"/> </manifest> See Question&Answers more detail:os...

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

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516 views

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c# - Linq to Entity Join table with multiple OR conditions

I need to write a Linq-Entity state that can get the below SQL query SELECT RR.OrderId FROM dbo.TableOne RR ... condition join for 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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What JavaScript libraries are known to use the global dollar sign: window.$?

Which JavaScript libraries take over the $ variable in the global scope? If the library provides a different name ... each other very quickly. See Question&Answers more detail:os...

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

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regex - Character class subtraction, converting from Java syntax to RegexBuddy

Which regular expression engine does Java uses? In a tool like RegexBuddy if I use [a-z&&[^bc]] that expression ... that is not b or c See Question&Answers more detail:os...

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

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347 views

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html - Cross-browser embedded font in svg image

The title is ambiguous; let me clarify: I have an svg image which includes a text I want rendered with a custom ... font inside an svg image.) 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 curly braces in array notation

I'd just come across a very weird bit of php code: $oink{'pig'} = 1; var_dump($oink); $oink{'pig'} = ... mentioned in the manual. What is 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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367 views

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python - How do I change the background of a Frame in Tkinter?

I have been creating an Email program using Tkinter, in Python 3.3. On various sites I have been seeing that ... background needed to be white. See Question&Answers more detail:os...

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

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572 views

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java - How to get carriage return without line feed effect in Eclipse console?

If I System.out.print("something "); at console, I have cursor back at the beginning of line, and finally after ... /LF. How can I setup 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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tree - Angularjs: ng-options group by

I have this one level tree situation: <select ng-model="tipost" ng-options="tip.DESC group by tip.TIPIS for ... ] - CHILDNAME1 [ GroupName2 ] See Question&Answers more detail:os...

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

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