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556 views

1 answer

如何在页面上显示100个不相同的实时视频图像？

如何在页面上显示100个不相同的实时视频图像？做过这方面功能的应该知道难点...

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

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794 views

1 answer

c++ cli - Passing a CLI/C++ array to a C function

I need to call C functions from C#. I have created a C++/CLI wrapper to load the DLL and call the relevant functions ... call the C function. Please point me what I am doing wrong....

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

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939 views

1 answer

java - spring data R2DBC change @Table dynamiclly or another strategy

I have a problem about spring data R2DBC with sql server, I've used @Table annotation and a value of this is e.g. ... but I think that this way is unsafe. Thanks for your answers....

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

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770 views

1 answer

阿里云binlog。在我往表里新增字段后一直报错

canal.deployer-1.1.4阿里的版本监听了一张表，然后我在这张表新增字段，然后爆了下面的错请问是什么错改怎么解决呢 `2020- ... .AbstractEventParser$3.run(AbstractEventParser.java:258) at java.lang.Thread.run(Thread.java:748) `...

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

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1.1k views

1 answer

MySQL使用字段自定义字段排序后，查找上一篇下一篇，但是查找上一篇不正确，怎么办？

这是正常排序情况：以下是查找上一篇的sql： SELECT * FROM article WHERE sort >= 0 AND time >= '2020-10-25 14:15:56' ORDER BY sort DESC,time DESC; 得到结 ... ', '内容5', '0', '2020-10-25 14:15:56');` 求大神指教！...

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

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1.5k views

1 answer

指数形式的傅里叶积分

老哥们救救孩子吧，划线的不知道怎么来的...

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

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2.6k views

1 answer

Application Insights Summarize with Having clause

I need to summarize an Application Insights query where the count > 1. I don't see any "Having" clause like SQL ... summarize Count = count() by MessageId | order by Count desc...

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

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2.8k views

1 answer

laravel - why docker container is not runnig in windows?

Help me friends, please. I'm a noob in docker. I'm working with laravel an create project with Docker in ... linux debian build 19042 Docker version 20.10.2, build 2291f61...

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

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3.1k views

1 answer

python - How to sort a dictionary by values without using in-built sorted function?

I want to implement this without using the sorted function (perhaps by using a priority queue): nums = [2,3,1,3,2] dic= ... sorted_dic= dict(sorted(dic.items(),key=lambda x: x[1]))...

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

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3.2k views

1 answer

百度地图自定义瓦片图超出加载一些没有的图片

我用baidumaptileCutter制作了一张自定义的瓦片图，然而我的图比较小，打开的时候加载了一些没有的瓦片图，都是报404错的；我想问下超出之后怎么让他加载指定的一张图片？...

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

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3.3k views

1 answer

java - why does the code loop past 122 in ASCII Binary

So I'm having trouble understanding why the given code doesn't work out as intended as expected, what I want to get is for it to ... } } System.out.println(news); news = ""; } } }...

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

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3.4k views

1 answer

syntax - What does map(&:name) mean in Ruby?

I found this code in a RailsCast: def tag_names @tag_names || tags.map(&:name).join(' ') end What does the (&:name) in map(&:name) mean?...

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

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3.3k views

1 answer

在vue项目中，如何在js文件中获取静态文件？

我想在 js 中获取一个静态文件，使用上面的写法我获取不到我尝试了很多路径书写方式，试过绝对路径，相对路径，@ 等，但是，都不行，我的 loadJSON() 是在同级目录下的一 ... injected --> <script type="text/javascript" src="/app.js"></script></body> </html>...

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

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3.5k views

1 answer

js 中将直接声明的函数赋值给一个变量时为什么函数会再执行一次

首先感谢一下阮一峰老师开源的《ECMAScript 6 入门教程》在学习阮老师的ES6入门教程到Generator函数的语法这一章的yield部分时，阮老师举了例子，就是下面这段代码，对其中的一步有点疑问 function* f() { ... 个变量时会被执行一次，这是为什么？js只看了红宝书，好像没有提到这一点，要不就是自己看的不仔细 ...

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

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6.5k views

1 answer

git - Sourcetree cannot clone repository if wrong login credential in the first time

After I enter the clone url it appears a login screen entering the login name and password. However, I wonder I type ... am new to Sourcetree and Git, hope someone can help me....

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

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3.7k views

1 answer

c# - Why is my implementation of a custom TypeDescriptor to retrieve second-level property for DataGridView not working?

I am trying to implement Linda Liu's solution for displaying second-level properties in a DataGridView. If I'm ... false; EmployeeGridView.Columns["HireDate"].Visible = false; }...

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

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3.8k views

1 answer

sql - How to avoid using limit clause in my redshift query?

I have a below query where I am using limit 8 to get value of dates as shown below: SELECT (date_trunc(' ... --- error: Output timestamp out of range after subtracting constant....

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

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3.7k views

1 answer

uni-app在IOS下使用webview拉起H5支付难道无解了吗？

我的开源项目酷瓜云课堂客户端是使用 uni-app 开发的，本来是想着全端支持省事，现在就遇到IOS下拉起h5支付不理想的问题 uni-app 的 webview 对应到H5其实就是一个 iframe, 加上了sandbox属性 ... 应用 safari chrome qq uc 支付宝 ? ? ? ? 微信 ? ? ? ? 有什么好的解决方案吗？...

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

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3.5k views

1 answer

奇怪的动画，代码如下

https://codepen.io/779102260/... <!DOCTYPE html> <html> <head> <style> body { height: 500px; } div { width:100px; height:100px; ... "800px"; // }); }, 500); } </script> </html>...

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

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3.6k views

1 answer

yii2使用joinwith 子表数据为null，添加asArray后，正常，询问下原因？

$list = orderExtra::find()->joinWith('visitor')->where([]); // $list = $list->asArray()->all(); $list = $list->all(); 子表关联语句: 使用身份证号进行关联 ... 但不知道问题出在哪里，以及不知道要去哪里查找问题，请教有没有大佬可以给出点意见...

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

0 votes

3.6k views

1 answer

单页应用，微信H5 IOS路由跳转，页面跳过去了但是url没变化

系统：iOS 环境：微信H5 项目技术栈：Taro React 路由模式：history 由于跳转的是支付页,url没变成支付页的url，导致提示url未注册。...

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

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4.2k views

1 answer

javascript - TypeError: Cannot read property 'ref' of undefined

I am trying to use Firebase in my Nodejs project but I keep getting an error and I cannot figure it out. my ... I got this error TypeError: Cannot read property 'ref' of undefined...

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

0 votes

3.8k views

1 answer

数组对像合并，用新的内容覆盖老的怎么解决

数组对像合并 //默认数组队象 list:[ {a:'标题',b:'5',c:'text'}, {a:'简介',b:'50',c:'text'}, ] 新设置的数组队象覆盖合并到上面的数组队象中，用新的数据覆盖默认数据， ... '10',c:'text',d:'time'}, {a:'简介',b:'150',c:'text'}, ] 求问有什么好方法！...

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

0 votes

3.6k views

1 answer

在debian9环境无法启动k8s

在debian9环境无法启动k8s，请问这是什么原因， docker logs CONTAINERID发现竟然没有容器启动，docker镜像也下载下来了，大家有没有遇到过？执行命令：kubeadm init ... To see the stack trace of this error execute with --v=5 or higher...

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

0 votes

3.7k views

1 answer

html - How to simulate outlook clients

Its 2021 and this is painful. Is there anyway for me to quickly preview a HTML email? Litmus is too expensive to justify at the moment. Is there any alternatives?...

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

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3.5k views

1 answer

Python - How to efficiently write/read a JSON file inside a compressed archive in one go?

I am using Python 3.8 and would like to save a dictionary of data into a JSON file that is compressed in an ... . Other high compression ratio methods are fine, too. Thank you!...

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

0 votes

2.6k views

1 answer

audio - What are features in signal/image processing using a more tangible or less abstract description

I'm learning about signal processing for music right, and what I'm reading keeps using the term features and I find that ... one would be able to draw out or make a picture of....

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

0 votes

2.7k views

1 answer

火狐浏览器下载文件失败解读成json文件怎么解决

火狐浏览器怎么解决下载文件失败问题...

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

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