标签云

微信群

扫码加入我们

WeChat QR Code

WebSoCultOnMead事件只被触发一次

I'm using a basic WebSocket client within Angular 6 application. Everything works except for some reason both socket.onmessage or socket.addEventListener('message' are fired only once. No errors on

为什么抽象语法树是必需的?为什么递归下降分析器不能解析呢?

I am a beginner when it comes to interpreter design and after learning a little about language design (grammars, language, lexers, parsers), I don't understand why it is necessary for the parser to

是否有任何带有显式纯修饰符的语言

Are there are any languages with an explicit compiler-enforced pure modifier apart from Solidiy? I know that some tools allow marking functions as pure for static analysis, e.g. @Contract annotation

订单MySQL的最佳匹配结果

Ok so imagine this mysql query SELECT * FROM table WHERE table_string RLIKE '[[:<:]]this[[:>:]]' OR table_string RLIKE '[[:<:]]is[[:>:]]' OR table_string RLIKE '[[:<:]]test[[:>:]

如何设置一个参数的权重

Now set of sizes of block look like: weight="811px" & height="811px". How set one parameter for weight & height if block have square/quadrant form? May be size="811px" or quadro="811px" :-) ?

在Windows 10上获得\\xYZ网络上共享的文件夹名

I am trying to get list of all Folders shared on network \XYZ , I am able to access each folder if I provide folder name like below code. OS.listdir('\\\\XYZ\\folder1') But I want every folder name

约束布局底部按钮被关闭屏幕

enter image description here As you can see in the image, i have a constraint layout and inside i have another constraint layout, and 3 objects aligned vertically, at the top other constraint layout,

如何在Django中从一个模型获得另一个模型中的值,

I am new to Django so please be kind -_^. I have two models "cats" and "litters". Litters contain two elements with names. I have a bunch of Cats. I want it so as a user, I can associate any cat

删除包含两个的所有行

I have like that: a1@305@ a50@21 b6@@ The first and the last lines should be removed because they contain two @ What should be the regex for that? Any help would be appreciated,

如何用OpenCV Python调整面罩的大小?

I would like to obtain a mask for a small (resized) image (800x600). Then I would like to resize the mask and apply it to the larger image (3000x2000). What would be the best practice for this purpose?

从GITWiKi创建GITBoo/PDF的最小步骤是什么?

Similar questions: Create gitbook from github wiki pages , How to import a markdown file from github into local gitbook I need to read some documentation, and wish to save it all as PDFs (to read on

我怎样才能让因特利捷终端与OH我的ZSH一起正常工作?

I love Oh My Zsh, but it has never worked properly in the JetBrains product's Terminals: cannot find executables cannot use version managers like pyenv, sdkman, rvm Oh My Zsh is zsh shell

CSS网格图像库:如何调整所有图像的大小和保持相同的距离?

Just trying to create a simple image gallery that's 3 x 3 using CSS grid. I thought using a container with the following css styles would resize them all equally: .portfolio { display: grid;

Java中的GUI冻结

I have created tic-tac-toe with a GUI in java. The way it works is that it uses an array to keep track of the board. It works great except in the case of a tie. I have created a method to detect the

在使用Hue-IpPar中的查询时,如何在使用CONTAT和创建管道分隔文件时重命名列?

I am writing : select concat(col1 , '|', col2 , '|', col3 , '|', col4 ,'|', col5) Tried using AS to get the column names but get an error. concat(col1 as parent, '|', col2 as child, '|', ..)

用不同的光标在同一表上插入数据

I am trying to do a procedure with 3 different cursors, obtaining data from the same table. The first cursor only obtains the collections, the second cursor obtains the invoices, the third cursor

如何使用NoDE.js(没有框架)正确上传和保存照片

I'm adding photo uploading feature to my chat. I have POST parser from this answer, and little code that saves image to uploads directory. var ext = exports.getFileExt(Object.keys(partsByName)[0]);

在正则表达式中使用哪一个符号来选择一个选项

select 'A' REGEXP '^A|B$' as '|' symbol is behaving like "or" example select 'AB' REGEXP '^A|B$' = 1, I need regular expression which returns 1 only in case given value is A or B.

2个集合之间的MangGDB聚合

I got 2 collections in MongoDB : - Member collection, including lastname and firstname - News collection, with the following format : { title: String, content: String, comments: [ {

在自定义适配器中设置视图可见性,同时向适配器中添加更多数据

I have a custom adapter, which I show and hide view's visibility based on json value received. It works perfectly fine until I try to add a new item to the data at index 0(i want to to add new item to

ECS不能识别容器定义中的Env设置值

Goal I'm trying to deploy my NodeJS ExpressJS API in a Docker container running in my EC2. I'm not sure why my container does not recognize the value of my .env that I created via my container

在中兴ZXV10 W300路由器上创建打开/关闭无线的脚本

i want to create a script to turn on/off wireless on my router from windows just with one click . to turn turn on/off wireless from the pc i need to go at this adress : http://192.168.1.1/basic/

Android应用程序在测试后卡在脸谱网登录上

So I am new to android development. And for testing I created a small app to test the facebook login with firebase. Until this everything goes alright. But when I test it on a phone the fist times it

如何将Base64与SRC中的类型连接起来

<div *ngFor="let el of list"> <img [src]='el.photo' </div> Api retturn el.photo = '/9j/2wBDAAMCAgMCAgMDAw' and i want concatante with data:image/jpeg;base64,

将PHP数组转换为JSON(CONBASE)

I’m searching for a solution to read data from an PHP array in a class property. Request: $accounts = $client->getAccounts(); Here’s the resulting array: Coinbase\Wallet\Resource\

在核心图像最小之前建立其他图像

Thanks for your time and help I have integrated swupdate in my Yocto Project. Now, to create software update rescue root file system, I need to first execute the command: bitbake swupdate-image

NGBOOTRAP评级渲染屏幕阅读器元素

I am trying to use NgBootstrap rating system in my project. The problem I am having is the rating system is rendering screen reader (see picture above). the markup looks like this in my component &

如何使这3个非常相似的功能更短

Hello so today I was curios how would I code smarter and shorter. here is litle project I did like 2 weeks ago: // Get input element let filterInput = document.getElementById('filterInput')

在表单加载中选择设置组合框项

I have form1, which contains subformA and button1. When the user is viewing form1, selects a record in subformA, then clicks button1, a new form2 will display. On that form2, one of the records is a

如何测试反应样板组件中的子节点的存在

I'm working on my first react-boilerplate tests for a component and this has me reading documents from various overlapping sources and unsure which pieces apply. Given the component: /** * *

登录用户的QueSET集模型

Is there a way to query a model for a logged in user that will be ever-present throughout their session? In other words, I want to show model details to a user on every page that requires

通过进程获取进程的名称

For example from the PID 10948 I would like to get the process name of firefox.exe I've tried using GetModuleFileNameEx, GetModuleFileName, GetProcessImageFileName, and GetModuleBaseName and all of

如何在PHP中被白空间包围的文本替换

I'm trying to create a form that users can submit and use to find and replace text in a long string. However, many of the strings I'm replacing are only 2-3 letters (e.g. "od", "ph") that are often

在Spring Security中登录不同角色

I am designing a login page (Thymeleaf and Spring security) and want to provide user option to chose his role during login . A user can have admin and/or user role . I am using spring security for

如何下载特定的拉取请求?

I did run both of these commands and switched to the newly created branch but the folder still doesn't contain the PR code git remote add upstream https://github.com/particular/repo.git git fetch

星星之火的数据帧列无聚集

I have a csv file in hdfs : /hdfs/test.csv, I like to group below data using spark & scala, I need a output some this like this. I want to group by A1AN column based on A1 column and the

使用Python 2.7更新for循环中的时间、时间()值?

With the following code, I'm confused as to why time.time() does not update inside a for loop. For example: import time for x in xrange(5) print(time.time()) Is it possible to have that value

加载多条条纹

I need a little tech help on this one. As you can see here https://www.vtxfactory.org/#pricing I have multiple Stripe <form> containers and inside each of them a <script> tag with a src

I'm having issues moving the '+' button to the right of the words 'Popular'. Here's the code: <ion-header> <ion-navbar color="navbar"> <ion-buttons left> </ion-

Excel:EnUM实例不是类型的成员

I have string enum: enum Country:String { case France case Germany case UnitedStates } But depending on the uibutton restorationIdentifier I want to do something. I have this ibaction:

减少火花分区中的哈希图

i have a RDD of some mutable.Map[(Int, Array[Double])] and i would like to reduce the maps by Int and find the means of the elements of the arrays. For example i have: Map[(1, Array[0.1, 0.1]), (2,

JSONSerialIsExtExpExc:不能创建和填充列表类型PARSES。

As soon as I attempt to login and store the ParseUser complex object in session, I get a JsonSerializationException. What's going wrong? private const string CURRENT_USER_KEY = "CurrentUser"; private

如何更改文本位置?[复制品]

Please see the preview Yes i want to change the position of the text. This is just HTML for this. <div class="color-traces"> <span class="rejected-by-admin"> <strong>

DimoDB Java中的分区键串

Is there a method in java for DynamoDB to get the name of the partition key given a table? In other words, I want a method that will return a string of the partition key name for a table. I can't seem

我如何调用一个单独的嵌入文件,然后命令它?

Sorry for the noobiness of this question. I currently have a Discord.RichEmbed stored in a separate file called embed01.js which is stored in my bots main directory. I would like to call it into the

D3按钮不工作

I have been going in circles and can't get this button to work. My intention is for the response_handler() function to be called when the button gets clicked. I can't figure out what the issue is.

在JoOMLA中添加斜杠/ URL

Iam looking for redirecting adress on adress with slash /, for example: https://stackoverflow.com/questions/ask to https://stackoverflow.com/questions/ask/ with slash on the end. In joomla 3.8.6 In

The following code compiles: fn consume(_: Box<u64>) {} let tuple = (Some(Box::new(1)), Some(Box::new(2))); match tuple { (Some(x), Some(y)) => { consume(x); consume(y);

如何在一个时间序列上合并两个数据帧

What I am looking to create is a dataframe which looks like: amount months category 0 6460 2018-01-31 budgeted 1 7905 2018-01-31 actual 2 11509 2018-02-28

函数中的自定义EngEngsMeaseBox不从发件人类显示属性

I have a class with two properties: weigh and Id. I want to trigger an event when weigh is set. The event to be triggered is a messageBox showing the Id property. The Messagebox is shown, but it doesn'

2

0

1970年01月01日00分07秒