html5 - How to use Canvas technology to create a music score that jumps up and down

I would like to ask how to use canvas technology to create a music score that jumps up and down. It is similar to this picture, with a simple effect of jumping up and down!

PHPz 2017-05-16 13:21:58 0  1  754

angular.js - How to implement image sliding switching using only AngularJs?

The codes found on Baidu for AngularJS's image carousel effect or image sliding switching effect are basically implemented based on the bootstrap control. How to implement pure AngularJS without jQ or other. Achieve the effect of sliding to switch pictures like the top banner of the baby details pag...

大家讲道理 2017-05-15 16:51:32 0  1  796

linux - Ubuntu reports xxx:command not found every time su is executed, but the user switch is successful

{Code...} There is a method that says to add usr/bin to the profile, but it has no effect. Another method also says that there is a problem with the profile, but my profile is basically unchanged and does not have the square brackets after it as he said. Question about adding spaces

PHP中文网 2017-07-06 10:36:22 0  1  1446

Accessibility: alt or alt="" for decorating images

As far as WCAG2.0 accessibility is concerned, if I write alt or alt="" in html, are empty alt tags equally valid? Like this: <imgsrc="some-image.jpg"alt=""><imgsrc="some-image.jpg"alt>Are they both valid for describing decorative images? Use alt=&a...

P粉364129744 2024-02-03 21:18:47 0  2  413

angular.js - angular content is too long, expand and collapse effect

1. The content in the div is too long. When the content is too long and exceeds the display of two lines, a [Display] tag will appear. After expansion, a [Collapse] tag will appear at the end of the content, similar to the talk published in QQ Space. Long In order to display the full text and close ...

仅有的幸福 2017-05-15 17:02:00 0  3  740

Gradient effect of CSS display properties

I'm currently designing a CSS "super dropdown" - basically a regular pure CSS dropdown, but with different types of content in it. Currently, it seems that CSS3 transition effects do not apply to the "display" property, that is, there is no way to transition from display:none to ...

P粉608647033 2023-08-21 11:08:32 0  2  578

javascript - How to open another process after closing the main process in node?

Although this requirement seems a bit illogical, what I need to achieve is an automatic update effect, compress the ZIP downloaded from the server to another folder, and then close the old version before opening the new version. Because it is based on NW.JS and does not support multi-window preview,...

習慣沉默 2017-05-16 13:45:05 0  1  607

Use mouse wheel for page zoom, click and drag to pan the page

How to create scrolling and panning effects for the entire page using the mouse wheel? Basically just like any 2D editor, scroll to zoom and click and drag to pan, but for the entire body. I can't find any information about it online.

P粉308783585 2024-03-26 14:11:27 0  1  347

javascript - A question about the mousdown event

Please help. I used $.animate to implement an event based on the page element mousdown. After doing it, I found a problem. After clicking the mouse multiple times in succession, the animation will be played repeatedly multiple times. The effect I want to achieve is to start from the beginning every ...

世界只因有你 2017-05-19 10:14:34 0  1  417

angular.js - angular project version management

Based on a completed spa project, multiple versions may be derived. Apart from different style interactions, these versions share all other logic. Is there any good way to manage these projects conveniently? Achieving a common core function upgrade, and all other projects are smoothly upgraded. Hope...

phpcn_u1582 2017-05-15 17:05:09 0  3  591

How does github collaborate on development?

When I joined a new company, I was asked to familiarize myself with the project first, so they cloned a code from github and gave it to me, but I found that it was a bunch of empty stuff, with no data at all, and the files were not connected together. Even if I change the code inside, I can't see th...

巴扎黑 2017-05-02 09:40:49 0  5  574

Revalidate after mutation in reaction query: step-by-step guide

I have a basic implementation of data fetching and updating using react-query on a next.js application. My goal is to update the data after mutation. Currently, the data is only updated when the tab is refreshed. But it won't change without user interaction. I found that the data update happening wh...

P粉752290033 2024-03-25 21:53:26 0  2  448

How to set text color to black in Flutter web app when device display mode is dark?

I've created a web app in Flutter and it works as expected, but I'm having issues with it on some mobile devices (specifically the default browser on Samsung devices, it works fine on Chrome). On the login page, my page background color is white and the text form field text color is black, but when ...

P粉216807924 2023-09-11 20:16:42 0  1  569

Button activation causes hover effect to malfunction

I've been trying to learn the basics of web development (HTML, CSS, and JS), so I've been trying to make a working Apple calculator. Everything was working fine until I noticed a small bug. At first, the hover effect on the action button worked great, the color became brighter as I hovered. When I p...

P粉548512637 2024-04-01 21:51:26 0  1  549

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  815

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  719

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  610

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  571

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  1000