redis - 腾讯的QQ平台如何维护庞大的在线用户列表？

我想知道腾讯的QQ平台如何维护庞大的在线用户列表，我目前的想法是根据QQ号做负载均衡。

天蓬老师 2017-04-27 09:03:12 0  1  686

javascript - In some video-based h5 pages, how to obtain the video buffering progress or how to preload the video

[Tencent Carnival h5] http://news.qq.com/FERD/jiani... Open the link and you will find that the page has many <video> tags and too many video elements. The video must be edited before the user sees the homepage. Do preloading to prevent lagging, but the video element is different from ...

漂亮男人 2017-05-16 13:30:15 0  1  636

JavaScript development of Baidu map

JavaScript development of Baidu Map 1. Complete the content and mark different icons according to different business types (A, B, C, D, E) (completed) 2. Click the marking point to pop up the title in the markerArr array respectively, yetai and other content can currently pop up The content of the m...

九日 2020-05-13 14:03:06 1  5  1219

How to implement navigation bar hover effect

I'm working on my vertical navigation bar. The name of that icon should be visible on the right. The name is also supposed to change from white to black when the mouse is over the icon, but it's not working. I tried changing the tags around to see if that helps. I also changed the tag in the HTML an...

P粉041758700 2024-01-10 18:06:56 0  1  413

Title rewritten to: Issue with rendering BLOB image

Hi I have saved jpg image in BLOB format in mysql. I'm having trouble rendering an image to my view page using PHP. When I use header('Content-type:image/jpeg') it gives a message on my page because the image cannot be displayed because it contains an error. When I print without the header functiona...

P粉814160988 2023-10-31 08:54:55 0  2  678

"Bootstrap 5 - Margin aligning elements inside and outside the accordion"

I'm trying to align three Bootstrap5 grids: Title outside the accordion Overview in the accordion title Details in the accordion content The accordion title has left and right margins/padding, and the accordion icon takes up some space as well. I want the grid of titles and details to use the same &...

P粉834840856 2023-08-31 12:54:27 0  1  582

How to use CSS selectors to target div elements containing specific attributes or tags?

I'm working on a POS system that generates a website. Most of the code is proprietary so I can't edit much. I have an output list of categories with some images floated as categories. I want to hide the first 3 listed on the home page. I tried positioning the containing div using div:nth-child(1), w...

P粉493313067 2024-04-03 22:25:59 0  1  369

Create a navigation bar similar to toast ui home page

My source of inspiration I wanted to make a navigation bar like this: Toastui Home Page What I did I tried to copy as much as possible to achieve this. I get the following: What I want I want something like this (these were made via image editing): Option 1: Center aligned Option 2: Left aligned I w...

P粉619896145 2024-04-01 18:34:38 0  1  346

Vite Reactjs website app not calling API in production but running fine on localhost

I'm trying to deploy my application on Netlify. The landing page fetches a series of images to create a gallery effect. The login page is running fine on the local machine, but after deployment the API is not being called and the application is in a loading state. Login page on Netlify server. I fou...

P粉794177659 2023-08-10 16:32:46 0  1  622

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 0  1  736

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 0  1  670

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 0  1  564

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 0  1  523

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 0  1  955

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 0  1  476

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 0  1  653

Spades, Diamonds, Hearts, Clubs => styles do not change font color in Chrome for Android

In Google Chrome on Windows, the card suit symbols (spades, hearts, diamonds, clubs) are colored correctly using the "style" attribute. Unfortunately, the same page displayed in Google Chrome on Android does not display the colors I defined but uses the default black and red. (See the atta...

P粉896751037 2023-09-05 15:25:13 0  1  726

How to hide mui TextField label?

I'm developing a Nextjs app and I have a dashboard navigation bar built with mui that contains a notification that opens the notification box, which is built with regular HTML and CSS. dashboard-navbar.js: importNotificationBoxfrom"./notification-box/notification-box";//...exportconstDashb...

P粉239164234 2023-09-05 15:41:00 0  1  622