Recent questions in Technique[技术]

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node.js - AWS Lambda - NodeJS CSV Data to S3 File

Experts, I have a JSON object that I need to save to the S3 bucket as a CSV file. This is what I have managed so ... fine and this is the last printed log. Writing to s3 bucket.....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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js异步同步问题

在微信小程序中遇到了异步转同步的问题，代码如下： checkUserState(){ var _this=this; wx.cloud.callFunction({ name: 'getUserOpenInfo', success: async res=>{ var ... 是乱的怎么才能让上述异步方法转同步呢，等待异步方法执行完毕呢 ...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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581 views

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pymongo - How to paginate on array of array with using $skip and $limit in mongodb?

The pagination works on "records" with the following query for the defined document in MongoDB by changing $skip and $limit ... "first_name33", "last_name": "last_name33" }] }] }...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mac上push代码的时候提示fatal: the remote end hung up unexpectedly?

仓库用的是https://git.9vz.cn/ 里面的 push代码的时候报错fatal: the remote end hung up unexpectedly? 在mac os上push的时候报错, 换成windows可以提交, 按照网上设置了大小后还是报错有解决的同学帮一下忙, 谢谢!...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python使用urllib.request.urlretrieve下载图片到文件，怎么感觉是一个异步的过程

会下载24张图片，但不是像以前那样，文件名从0开始下载，而是不断地覆盖23.jpg这个文件名，请问这是什么问题呢？（特别像js的异步与闭包）...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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请问观察者模式具体在React中如何使用？

网上看了很多原生JS的结束，但是在react中我真的不知道该怎么使用，有大佬可以简单的举个例子吗...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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新建web项目创建servlet之后,访问不到这个servlet ,

启动项目没有报错,访问这个servlet之后提醒java.lang.ClassNotFoundException: 但是实际上,项目里面有这个servlet文件 web.xml里面配置的class路径也应该没有问题 jdk 是1.8的,tomcat是8.5的这个平时公司的项目也是这个,应该没问题呀,不知道为什么我自己建个项目就会找不到呢...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Integrate React 17 with webpack 5 and babel-plugin-react-css-modules (css modules with stylename)

I am trying to setup a react app with latest versions. React 17, Webpack 5 and other modules. I need css modules with ... column; } .title { font-size: 24px; color: red; }...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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413 views

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visual studio code - Automatically start/stop webserver in vscode debug

When debugging a web project, it needs to be built, served by a webserver, and opened in a browser, with a ... seems quite convoluted and dirty. Is there really no better way?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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node 路由间事件通信问题

路由间事件通信问题，通过事件监听器问题 ... const EventEmitter = require('events') const eventBus = new EventEmitter() fastify.get('/', (request, ... .emit('evt') reply.send({ hello: 'world' }) }) ......

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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342 views

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android studio 如何交叉编译

点击这个assemble 生成的都是json这是为啥呢？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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436 views

1 answer

backpropagation - Neural network: How to calculate the error for a unit

I am trying to work out question 26 from this exam paper (the exam is from 2002, not one I'm getting marked on!) This is the ... (x)) ...but then I got stuck, if anyone has an idea...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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319 views

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正则如何匹配繁体字？

需求是：在文章中，匹配到繁体字并将其去掉。最初想使用匹配unicode的方法，后发现无效，没了思路。请问如何解决？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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178 views

1 answer

r - Plotting the amount of times a value was present in a column in ggplot

I'm building a Shiny application to create visualizations for output reports of a system that I have. The report contains ... as Address Code. [1]: Plot table objects with ggplot?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer

influxdb插入一条当天的数据，搜索时为什么要回退10年才能搜到？

插入一条time为今天的数据： insert device_if_info_5min,asset_id="xxx" serial_number="ABV12543RRT" 1588900200000000000 插入成功，但是在搜索的时候必须回退十年才能搜索到： select ... 须now()-3700d，也就是回退10年才能搜到这个数据这是什么原因？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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279 views

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Why is R adding an extra row when converting characters to dates

I am converting a vector of character data types to date data types in R using strptime. When I used sapply to check the data ... [1][2] [1] NA Thanks in advance for any help....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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216 views

1 answer

Linux device driver for display | Framebuffer

I am studying the display device driver for linux that runs TFT display, now framebuffer stores all the data that is ... framebuffer directly or it uses its own buffer as well?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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321 views

1 answer

typescript - Angular: Subject behaviour different when using forkJoin

Folks, can anyone explain this behaviour? This is working: this.sessionService.current$.subscribe(session => { console.log(' ... this.subject$; Thanks a lot for a right direction!...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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163 views

1 answer

python - HTML from a webpage does not display foreign language characters correctly

Apologies if the title is misleading. I am trying to find out the language of a given song by querying a lyric site and ... this is happening or what I could do to work around it?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - How to filter for value in one column based on values from other columns in R?

Here is my dataset: df <- data.frame(label = c(1,2,3,4,5), measurement = c(100.5, 84.7, 100.7, 77.9, 98.8 ... 3 has the label I should go with. How can I do this across columns?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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412 views

1 answer

linux下如何用lampp集成环境反向代理node.js服务。

linux线上服务器下如何用lampp集成环境反向代理node.js服务。就是不用加端口号就可以访问到node服务...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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138 views

1 answer

javascript - Add row and td element and a checkbox in the table

I have the following table structure <form method=POST class='form leftLabels'> <table > <tr > <th >Code:</th> <td ... which the insert should be done, but the code does not work....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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290 views

1 answer

基于π演算的编译器前端设计是什么？

毕设做的是这个题目，老师让用Lalr(1)和SDT来生成中间代码。但是看了π演算的语法和语义后实在是无法理解该如何实现？请问有没有高人指点一下，指一个方向也好，谢谢！...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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134 views

1 answer

python - Page not found (Django)

I'm making website using Python Framework of 'Django'. I have some problems with Django about entering. The page for http://127.0.0.1:8000 ... ></a> </li> {% endfor %} </ul> </div>...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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511 views

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我们在使用i18n的时候，数据库内字段是怎么设计的？

我们在使用i18n的时候，数据库内取值是怎么设计的？数据库里存储的数据一般都是汉字，要全面地国际化，数据库是多一个英文字段吗？还是说怎么做呢？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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609 views

1 answer

怎么判断app里面内嵌的浏览器版本？

最近遇到个问题，页面在手机自带浏览器可以正常展示，在app内嵌浏览器却显示不正常，怎么判断内嵌浏览器的版本？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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312 views

1 answer

vue 中能返回来一个 html的代码段吗

类似这样的，就是想返回来一个代码片段，如果不这样写，或者其他的方式写也行...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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428 views

1 answer

spring aop问题?

伪代码: @Subject //aop注解 public void onMessage() { //通过ThreadLocal获取当前主题 Subject subject = req.get(); //some } ``` ... 计成这样是实现了`AutoCloseable close()方法`依靠它的特性自动remove threadlocal....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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