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Welcome to Our Knowledge Sharing Community-Open, Learning,Share

Welcome to developer's Knowledge Sharing Community-Open, Learning,Share 欢迎来到程序员专属的知识分享社区! 一个分享知识，传递知识，学习知识的社区！...

asked Feb 5, 2021 in Others[杂七杂八] by ostack (1.4k points)

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1.3k views

1 answer

el-input 正则只能输入数字，但是输入中文报错

<el-input v-model="detail.deliveryUserPhone" onkeyup="this.value = this.value.replace(/[^d.]/g,'');" maxlength="11" ></el-input> 当我第11位输入是中文 ... 说就不进入这个事件了，所以就一直验证不了，就算输入正确的手机号码也不行...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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663 views

1 answer

数据库中用户使用旧数据进行更新如何保证更新必定失败

问题描述假设当前有数据库表，其中一个字段为权重，现有数据行ABCD，其权重字段的值为1234；在某一刻甲打开页面，对其进行查看；然后乙在甲之后，对数据库进行操作，插入数据E,其权重为5，并随后调整权重为A-1 B-5 C-3 D-4 ... 借版本锁进行处理，即甲更新时版本不对，则直接抛出错误，并让前端刷新页面但是我的组长说不对，让我自己好好想想 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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687 views

1 answer

Node 中流文件读取的事件监听重复使用问题

let fs = require("fs"); let rs = fs.createReadStream('d:/01.wav',{flags:'r'}) let ws = fs.createWriteStream('d:/01-copy.mp4',{flags:"w"}) ... 解的这个流操作的机制，为社么打开关闭只有一次呢却能读取流对象内容两次呢？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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887 views

1 answer

reactjs - Render PDF output from JSPDF onto webpage in React

I'm planning to build a whole PDF manually with JsPDF since converting React Component is too messy at ... toDataUrl context.toDataUrl Any guidance would be appreciated. Thanks...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

ngxs - NullInjectorError: No provider for InjectionToken Window

I have been trying to debug this issue but I have had no success. I believe it's a lack of ... /_karma_webpack_/node_modules/@angular/core/__ivy_ngcc__/fesm2015/core.js:7825:1)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.4k views

1 answer

next.js 引入antd按需加载样式，路由跳转样式不显示，刷新一下才可以

next.js 引入antd按需加载样式，路由跳转样式不显示，有时候组件也加载不完全，刷新一下才可以还有页面刷新的时候先没有样式再到有样式...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

List_editable in django-django admin when check a boolean field modify other tables in database

I want to ask a question about the list_editable column in django-admin. If I have something like this: class fooAdmin( ... or delete a row in another table? Thanks in advance....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

How to prevent function in R from updating values based on last variable specified?

I have the following function: stats <- function(data) { maxDay <<- max(data$TotalGB) avgDay <<- mean( ... of just doing something like user1$avgDay but this returns in NULL...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.2k views

1 answer

websocket结合php做数据实时展示页面

前端页面和服务器建立长连接以后，PHP怎么监控数据库发生变化进而给前端推送数据呢？求教...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.0k views

1 answer

python - Get BLOB file from phpMyadmin?

Hi all :) I've been programming recently in PHP and looking to convert BLOB files to show in a designated folder. ... $ajax_handler->add_response_data( true, $output ); }, 10, 2);...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.5k views

1 answer

什么是云服务和云管理平台？

我在阅读私有云的百科时候：私有云平台分为以下三个部分： l 私有云平台私有云平台向用户提供各类私有云计算服务资源和管理系统 l 私有云服务私有云服务提供了以资源和计算能力为主的云服务，包括硬件虚拟化集中管理弹性资源调 ... 云管理平台是指的对资源的管理平台吗？比如我可以看到基础设施的磁盘大小是怎样，内存是怎样，CPU利用率是怎样这个意思吗？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.9k views

1 answer

antd的master分支怎么找不到table的sticky的代码？

代码地址: https://github.com/ant-design......

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.9k views

1 answer

android - App actions doesn't work with google assistant for Internal testing version

I developed an application with react-native and I add app actions to the application. I followed instructions on ... work with voice assistant without create preview by AATT?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.9k views

1 answer

ChunkInTransaction filepath has been owned by transaction 20084

python api向dolphindb中保存数据出错 RuntimeError: <Server Exception> in run: ::append!(pt, t) => <ChunkInTransaction>filepath '/ ... transaction 20084 这是什么错误？怎么查看这个transaction 20084是什么？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.1k views

1 answer

逻辑习题: The Science of Programming, David Gries 第二章习题七答案有一句话看不懂

请问:原书解答中 This adds m propositions {E}i at the main level.到底啥意思?(见附件中划红线那句) 这使得主层增加了m个{E}i.(按我理解,应该是一次操作增加了k个啊.) 这使得主层由m个g组成的{E}i的个数增加了.(难道是这个意思?)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.2k views

1 answer

Embed object (archive, CSV...) into docx with Python script

I (and my team) currently plan to automatically generate Word documents from text sources. However, we often need to embed ... (typically not PDF). Thanks a lot for your help....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.7k views

1 answer

vue项目同时引入elementUI和Vant UI，全部按需引入，Vant图标不出现，也不报错，为什么？

如题项目主要用elementUI，又引入了Vant，想用一下vant的uploader组件，引入后功能能实现，但是图标不显示，也不报错。。。找不出原因。。。...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.4k views

1 answer

linux - CPU Scheduling in Operating System

Suppose that you are listening to an audio file, making a presentation, and downloading some large files from the ... operating system schedule these processes if you are running?...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.8k views

1 answer

css - Padding and margin not working on breakpoints

I'm using tailwindCSS. At the moment i want to make two buttons. They should be small (with a small vertical padding) ... plugins: [], } On bigger devices: And on smaller devices:...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.5k views

1 answer

vue路由上携带很多参数好吗

vue路由上携带很多参数好吗...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.7k views

1 answer

c - Keep leading zeros when integer length is unknown

The following program reverses user input. However, for numbers with trailing zeroes, the zeroes are 'ignored' when ... example: Enter an Integer: 3000 Reversed Number = 0003...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.8k views

1 answer

shell - extract content from patterns in File using sed

i am working on building and deploying artefact based on changed files in Github commit. i am able to get changed files ... modules/ in file. how can i extract these using shell ?...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.7k views

1 answer

list - Unpacking values from a tuple onto two variables inside a for loop in Python 3.8.0

I'm trying to unpack strings from a tuple (or could be a list) onto two variables within a for loop. Those ... the same question, can someone explain this in simpler terms please?...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

3.0k views

1 answer

swiftui - .enumerated() method not working on array

I am passing data to a ForEach and had no problems until I used the .enumerated() method. I got the error that ... { static var previews: some View { ContentView() } }...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.9k views

1 answer

c# - ASP.NET MVC AJAX Call to Controller Not Returning any Data

I'm trying to call an ASP.NET MVC controller using an AJAX Call. Basically I want to return customer ... Json(customer, JsonRequestBehavior.AllowGet); } Can someone help please?...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

3.1k views

1 answer

rust - How to turn two nested HashMaps in a Vec of tuples without for loops?

Take the following data type: let mut items = HashMap::<u64, HashMap<u64, bool>>::new(); I successfully managed to ... . How can I achieve the same result without using for loops?...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

3.2k views

1 answer

javascript - What is the proper way to redirect http requests based on the content in database?

While running an express server, what is the proper way to redirect incoming requests? I have two routes: POST and ... create new element => redirect to POST to handle creation...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

2.8k views

1 answer

visual studio code - VSCode - SQL Server (msql) Extension - Prevent query execution on tab change

I am using the SQL Server (msql) extension in VSCode and really liking it. However when I want to run 2 ... I prevent this from happening and retain the original query results?...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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