Jonic Developer Community

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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)

0 votes

1.1k views

1 answer

material-ui Snackbar 组件可以用静态方法调用吗？

RT，类似and-design的message.success(config)方法...

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

0 votes

888 views

1 answer

asammdf - how to combine two datasets to make one combined plot in python

I have a dataset of 6 parameters with 500 values each and I want to combine the two of the datasets to get the road curvature but I am getting an error. ... object of type '<class 'numpy.float64'>'; only Series and DataFrame objs are valid...

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

0 votes

688 views

1 answer

php - MySQLi SELECT statement requires LIMIT

I'm trying to display a listing of 6 columns from a database table. This table happens to have a bit over 30,000 records. What I've used in the past worked but ... upgraded to PHP 7.2 and MySQLi and the new code isn't working the same way....

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

0 votes

1.6k views

1 answer

微信打开页面显示空白

我有一个https的链接，在微信里打开这个链接，小米8是正常打开的。但是oppo ace2上用微信打开就是白屏，用自带浏览器是正常打开的，并且在该手机的微信上，用http://debugmm.qq.com/?forcex...，在x5内核下也是正常打开的；用http://debugmm.qq.com/?forcex...，关闭x5内核之后就是白屏了。我认为可以排除js代码报错的可能，那么是什么原因引起的？...

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

0 votes

799 views

1 answer

app嵌入的H5页面本地存储localStorage问题

搜索历史记录用的是本地存储，放到app会出问题吗### 问题描述...

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

0 votes

1.1k views

1 answer

c++ - Why can copy elision not optimise all copy operations?

I read about copy elision and how it can fasten up Programms by giving possibilities to write code more straight foreword without thinking about references of variables. ... elide all those copies leading to a or in the modification of b?...

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

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1.2k views

1 answer

hive - Transpose and add new record in SQL

SELECT COUNT(DISTINCT CASE WHEN customer_name = 'Alex' THEN item END) AS by_Alex, COUNT(DISTINCT CASE WHEN customer_name = 'Bob' THEN item END) AS by_Bob, COUNT(DISTINCT CASE ... by_Bob" (2) and "by_Alex" (3) and add 5 under "Count" column?...

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

0 votes

1.2k views

1 answer

Force an error in gunicorn to test logging

I am running django+gunicorn and I have added errorlog='/var/log/gunicorn.log' to my conf.py. I'd like to force an error to see that this is working. Is there ... of? I am new to gunicorn and django, so I apologize if it's a no-brainer....

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

0 votes

1.9k views

1 answer

ios - Can CryptoKit be used with Objective-C

Hello I have an Objective-C project and I want to start using Apple's CryptoKit framework. Is this possible?...

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

0 votes

1.8k views

1 answer

sqlite - Android Room: Dynamically deciding on what tables to search

I have a Room Database with a Questions-Table and multiple Answer-Tables (with different kind of answers, like Multiple Choice etc). I want to query multiple Questions ... contain values. My question is if there's a better way to do this....

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

0 votes

1.8k views

1 answer

vue3常量变更的问题

在看vue3的视频教程（实际我没做过vue2的开发，直接来看的vue3），有个地方很不理解，看下图这个是视频教程中的一段代码，使用 const 定义了 count，并且给默认值0，下面的 increase 仍然可以修改count 使其每次递增1，这里的const 要怎么理解？const 难道不是常量么？常量不是不能变化么？...

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

0 votes

1.8k views

1 answer

两个对象数组对比,如果有相同的项就删除,不同就添加

两个对象数组对比,如果有相同的项就删除,不同就添加 var a =[{id: 1,content:'11'},{id: 2, content:'22'},{id: 3, content: '33'}] var b = [] // 这个时候 a和b不同我要把a数组的3个对象添加进b数组得到 b = [{id: 1, ... 有相同项和不同项 // 我需要把b数组中的相同项删除不同项添加进去得到 b = [{id: 3, content: '33'}] 请大佬帮帮忙...

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

0 votes

2.3k views

1 answer

java - Compile Errors and Compilation Fails

I have just started learning Java so please bear with me and my small minded questions :) I have a pretty general question- lets say we have 50 lines of code, when ... line 5, will the compiler continue to run, or will it stop at line 5?...

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

0 votes

2.2k views

1 answer

MVC模式的互动模式。

我在读这篇文章的时候： MVC的互动模式： 1） 2）我可以理解第一个，但是怎么理解第二个图？如果是Restful API，那么也没有View的参与呀。...

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

0 votes

2.4k views

1 answer

python - why does my map screen not work, can someone help me

imports: from kivy.app import App from kivy.uix.widget import Widget from kivy.properties import StringProperty from kivy.properties import ObjectProperty from kivy.uix.label ... .. Invalid property name [Finished in 2.0s with exit code 1]...

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

0 votes

2.4k views

1 answer

centos中安装jdk后找不jdk安装目录？

背景：我使用的操作系统是centos（虚拟机），想安装jenkins,奈何jdk还是1.6版本的所以想升级一下，然后就找了这个教程来升级我卸载了我系统中的JDK1.6，然后我使用yum -y install命令安装了 JDK1.8，安装成功之后使用java -version命令测试了一下，提示是正确的之后我就想去/usr/ ... 理之前应该配置了的啊所以现在的问题就是我想去配置环境变量，但是我找不到jdk1.8的安装目录希望有大佬能帮我解答下这个问题 ...

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

0 votes

2.3k views

1 answer

c# - How to solve this Declare variable Sql?

I am making a quiz app where the user can edit its questions from the database. What I am trying to do in the code below is that when the ... void QuizEditForm_FormClosing(object sender, FormClosingEventArgs e) { this.mParent.Show(); } } }...

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

0 votes

2.2k views

1 answer

c++ - I'm trying to call void functions in another function, but I don't know how to properly place them

#include <iostream> #include <fstream> #include <iomanip> #include <string> #include <cmath> using namespace std; // these should have all of my declared functions int start(char x ... cout << "This is not a command" << endl; } return 0; }...

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

0 votes

2.8k views

1 answer

docker build node老是报错

之前好好的，现在每次构建都报错，使过用cnpm，不过也一样 ERROR: Service 'web' failed to build : The command '/bin/sh -c npm install' returned a non-zero code: 1...

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

0 votes

2.9k views

1 answer

python - Currency Conversion Dataframe - skip Columns

I am retrieving Yahoo stock ticker data and want to convert the given currency to euros. For this purpose I am using the Python Library Currency ... multiplication. Alternatively I could just target that one column and convert it back?...

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

0 votes

2.9k views

1 answer

windows - MYSQL workbench installation stuck

I am trying to install MYSQL workbench on windows 10 but it stuck in "please wait while window configure MYSQL" and never process the downloaded version of MYSQL?...

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

0 votes

2.7k views

1 answer

有什么组件或模块能把vue节点字符串解析或转换为js对象？

如题，我获取到了vue文件的节点字符串如下所示 <template> <div class="content"> <img class="logo" src="/static/logo.png"></img> <div class="text-area"> <p class="title">这是标题</p> <button>提交</button> </ ... :'text-area' }] }] } } 并不一定和上面的完全一样，有没有类似的模块？还望各位大佬指点一二 ...

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

0 votes

3.3k views

1 answer

c++ - Why is Windows's SetCursorPos ineffective when certain programs are in foreground?

The win32 API's SetCursorPos moves the mouse to a location on the screen. However, sometimes it does nothing. See the following C++ code (Visual ... to believe they utilize some pathway besides SetCursorPos to get reliable mouse movement....

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

0 votes

2.9k views

1 answer

使用Apscheduler做cron调度，方法无法调用，但时间戳有更新，在线等大佬解答~

如题：一段时间之内(大概一天)job里面的函数会被调起来，但是这段时间之后就不再调用任何job里面的函数，但在数据库里的next_run_time每次都会更新 run_task这个方法没调起来，但是数据库里面的时间戳会更新求大佬解答~~...

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

0 votes

2.9k views

1 answer

javax.validation.Validator校验对象的时候，如何校验子对象？

Validator validator = Validation.byDefaultProvider().configure() .addProperty("hibernate.validator.fail_fast", "true") .buildValidatorFactory().getValidator(); Set<ConstraintViolation<TokenParameter>> ... 会被校验，但是子对象的字段不会被校验，请问如何解决？...

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

0 votes

3.1k views

1 answer

redis stream 断网重新链接

使用spring-data-redis,链接工厂使用lettuceConnectionFactory 配置如下 @Bean public StreamMessageListenerContainer<String, MapRecord<String, String, String>> streamMessageListenerContainer(PlanStreamMessageListener ... 就失效了，有大佬遇到过这种问题，有解决方案吗？...

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

0 votes

2.5k views

1 answer

代码如下，不知道如何写递归

data.forEach((item, index) => { arr.push({ id: item.id, label: item.name, disabled: false, children: [] }) if (item.list.length > 0) { item.list.forEach((item2, index2) => { arr ... item.id + '-' + item2.id + '-' + item3.id 不晓得这样的嵌套，递归方法怎么写...

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

0 votes

2.7k views

1 answer

asp.net core - Get Reference to ILambdaContext in Controller

What's the best way to get a reference to the ILambdaContext in a Controller running in AWS Lambda ASP.NET Core? It seems as though the below locks up. (ILambdaContext)Request.HttpContext.Items[AbstractAspNetCoreFunction.LAMBDA_CONTEXT]...

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

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