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java - computer image representation method?

Aren't pixels generally in RGB space (0~255)? So how are the numbers in the above image converted?

怪我咯 2017-06-23 09:13:48

javascript - About unicode emoji expression issues

This is to find a unicode encoding table {code...}. Take the first sun \ue04a and output \ue04a in the console. The result is garbled code. Then I find a 4-byte unicode, and the console outputs \ud83d\ ude1d works. Why is \ue04a not parsed correctly? ? All...

習慣沉默 2017-06-24 09:44:01

javascript - Regarding some document syntax expressions '[,'

1. I often see some sample syntax when reading documents, but I don’t understand the parameter representation in the syntax. What does it mean to use parameters separated by ‘[,’, as shown below:

滿天的星座 2017-05-24 11:38:27

javascript - Js function declaration and function expression

`alert(sum(10,10));var sum=function(num1,num2){ {code...} };`Why is the error reported? Isn’t there a variable promotion?

世界只因有你 2017-07-05 10:55:27

Wrapping Bootstrap tables: elegant presentation of linked column data

There seems to be no way to specify column widths when the data in a table cell is a link. How do I make this link wrap and respect the column width I provide? <linkhref="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css"rel="stylesheet"/><divclass=...

P粉486138196 2023-09-13 22:24:29

JavaScript iterator Problem with iterator?

See the chapter on iterators on MDN https://developer.mozilla.org... Generator expressions Then practice it yourself and find a problem. {Code...} The code is relatively simple. What I want to ask is why in the second method, when I don’t assign the add() method to it, I can’t...

ringa_lee 2017-05-19 10:47:40

javascript - How to implement this algorithm?

The data format is as follows: {code...} Requirement description: Draw each data on a 1-day coordinate map (00:00 - 24:00). The possible schematic diagram is as follows: 1. According to the startTime and endTime of the data, it can be obtained Get the coordinates of the data on the Y axis (expressed...

ringa_lee 2017-05-18 10:53:41

ES 2017: async function vs AsyncFunction object vs async function expression

I just read about async functions and found some similar features for ES2017. It's causing a lot of confusion, and I just want to ask: What's the difference between asyncfunction, AsyncFunction (used to create an async function), and an async function expression (which I think is just another async ...

P粉459440991 2024-03-25 23:44:59

Problems with unsigned types and signed types in C++

Question 1: "When we assign a value to an unsigned type that exceeds its representation range, the result is the remainder of the initial value modulo the total number of values represented by the unsigned type." How do you understand this sentence? For example, why is the result of assi...

给我你的怀抱 2017-06-19 09:07:29

PHP class for HTML table: strange attribute assignment

In the class that builds the HTML table, I have this method that renders the table. Everything works fine except for the assignment of HTML attributes under certain conditions (indentation, closing tags, data representation, etc.). When I set the cell data, I call setData() to receive the three para...

P粉384679266 2023-09-06 00:38:07

How to print a string in raw format (including all LINUX string representations like \t and \n) in JavaScript?

I have a string like this: "string1\tstring2\n\t\tstring3" I want to print the string in JavaScript. what should I do?

P粉009186469 2024-02-17 20:56:09

Shortest way to convert all PHP types to string

I'm writing a general system that I hope can one day be applied to fields like medicine (i.e. it's "scientific"). I think the best way is to represent all the data in php with strings (true will be "true", false will be "false" and so on). The reason for this is that in...

P粉369196603 2023-09-05 15:34:44

Ways to fix issue 2003 (HY000): Unable to connect to MySQL server 'db_mysql:3306' (111)

I recently tried to containerize my FastAPIPython server (also for replication/doubling purposes). Before, I had just a MySQL server in a Docker container and everything was fine, but when I also made my web server a service, it couldn't connect to the MySQL server, so now the application doesn't wo...

P粉178132828 2023-09-05 11:18:47

Experiment with sorting after query limit

So this is my first question here, please forgive me if something is wrong. I'm trying to make a sort query based on constraints. So there is a Customers table with 90 records. I want to first perform a query limited to 3 records, and then sort the results of this query by a column called ContactNam...

P粉237125700 2023-09-05 14:46:42

CSS Grid: Create new row when child content overflows column width

I have a two column layout based on CSS grid. When the content of the second column exceeds 1fr I want to create a new row. As it currently stands, the content simply overflows the column. One requirement of this layout is that the items in the right menu column are in one row. I achieve this with: ...

P粉212114661 2023-09-05 15:18:28

PHP full text search functionality using AND, OR and NOT operators

Newbie question: I'm trying to implement a full text search on a search string using php and eloquent. $searchstring="+(victimsuspect)+crime-covid";$searchresult=RssItem::whereRaw("MATCH(description)AGAINST('$searchstring'INBOOLEANMODE)")->ge

P粉076987386 2023-09-05 15:06:32

How to get average of DATETIME column in MySQL while grouping by other columns

I'm creating and populating a MySQL table using the following query: SETtime_zone='+00:00';CREATETABLEtimestamp_n_datetime(idINT,timeDATETIME,avg_timeDATETIME);INSERTINTOtimestamp_n_datetime(id,time,avg_time)VALUES("1","2023-01-0310:

P粉460377540 2023-09-05 11:46:21

Multi-device (mobile phone) synchronization - React Native

I'm trying to create a Lightshow that will launch on all users' mobile devices at the same time (can have up to 2000-3000 users). All users will use the Internet (Wi-Fi or mobile data). In our FE we use Apollo for subscriptions and it works like a charm. But the problem is, user A can get subscribed...

P粉151466081 2023-09-05 11:58:38