JavaScript bitwise NOT operator (~)

See the lottery code {code...} of <TFC2017/> Why can the ~ operator round numbers?

伊谢尔伦 2017-06-28 09:29:08 0  1  1030

Detect browser or tab closure

Is there any cross-browser JavaScript/jQuery code that can detect if the browser or browser tab is closed, as opposed to being caused by clicking on a link?

P粉760675452 2023-07-31 13:55:00 0  2  604

The element must disappear when the page nears the end

I have this JS code for adding and removing classes when scrolling down from the top of the page, but what I want to do is disappear when you get close to the end of the page or go back to revert to the old state after some scrolling (e.g. from the right: 7px to right: -150px). I copied the same JS ...

P粉463418483 2024-03-29 23:04:00 0  1  385

Loop through multiple elements and calculate the price discount for each element

I'm trying to find the percentage difference between the old price and the new price for each individual. Currently, my code only gets the percentage difference of the first one and loops the same percentage difference into the rest. Does anyone know how to update this code to target each individual...

P粉506963842 2023-09-02 17:14:31 0  1  520

javascript - jquery uses the for method to obtain the page attribute value of a repeated name and cannot get help.

The situation is as follows: I have a form that needs to dynamically add input items, and the name of each input item is the same. Since non-null verification is required, consider using jquery to obtain the value of each element and judge it. The code is as follows: $("#reg").click(functi...

PHPz 2017-05-19 10:17:03 0  3  513

Automatically expand text area

I'm trying to make a simple auto-expanding text area. This is my code: textarea.onkeyup=function(){textarea.style.height=textarea.clientHeight+'px';} But the textarea grows infinitely as you type... I know there are Dojo and jQuery plugins It is possible to achieve this, but I don't want to use them...

P粉245489391 2023-10-21 08:49:23 0  2  682

javascript - As a beginner in programming, should I use an editor to copy the source code of jQuery or thinkphp?

Beginners in programming, do you want to use an editor to copy the source code of the jQuery library or thinkphp framework? To improve your programming abilities and ideas? I remember seeing a person on Zhihu who did the same thing. Now look for that answer. Not here. Can the experts tell me how eff...

高洛峰 2017-06-05 11:07:36 0  3  597

Baidu search shows abnormal results. Please give me some advice. Thank you.

First of all, let me introduce that our company's website address is: www.comany.cn. Two months ago, the website was hacked by a lottery company. After the malicious Trojan was cleared, the Baidu search results page displayed like this: I tried changing the characters The set was changed from "...

Tony Chang 2018-06-05 13:27:53 0  0  1101

How to close Bootstrap (5.2) modal using Javascript?

For the sake of a school project I have created a modal using bootstrap in html in which I have a prompt that I have to check from javascript, how can I close the modal from javascript so that if the prompt is valid I can save the changes only if No, will I throw an exception? Small note (please don...

P粉369196603 2024-02-21 14:15:22 0  2  372

File reorganization causing problems with selections, hyperlinks and import templates?

I'm using jQuery to import a common template file into certain parts of the page. Everything works perfect until I organize my file structure differently. Now, my SELECT dropdown doesn't work except for the title, and even though VSCode autopopulates half of the regular hyperlinks, I can't keep trac...

P粉436410586 2024-02-04 10:37:52 0  1  533

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  821

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  723

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  611

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  576

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

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  506

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  698

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  755