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如何检查服务人员是否脱机?

I've been following this tutorial https://codelabs.developers.google.com/codelabs/offline/#7 and so far I was able to make my service worker cache the offline page and load it but I want to show this

WPF中加入均匀网格的儿童顺序

If you add a second child to a UniformGrid with 3 rows and 3 colomns, will it be added in the same row or to the same column? Thanks for your help.

在MySQL中让学生参与课程的最佳方法

In one of my projects I need to store a students list for each course. This is my current courses table: id | name | students ================================================== 1

使用线程工厂自定义线程的命名

I have a class that represent the world where subjects live in public class WorldLifecycle { private ExecutorService executorService; public void startWorld() { executorService =

如何添加名为MaGeto 1通讯

I've been trying to add the subscriber first name to the Magento newsletter. I've can't find anything on Google. I've looked at Adding a custom field to Magento's subscription module but it's not

颤动:将数据从TabBurVIEW(StaseFultWIGET)返回主脚手架

I want to create an App with Tabs to get the users input. The Problem is, that the different Tabs get different inputs, but i have to collect the inputs for the Database. My idea her was, that the

在锈迹中,人们如何在“循环”之后使用“取用”?

In Rust, how does one use a TakeWhile after a for loop? #[macro_use] extern crate itertools ; extern crate primal ; fn main() { let sieve : primal::Sieve = primal::Sieve::new(7_071) ;

Laravel don的形式

I try to make a form with multiples date inputs, I copy the model from the register / login blade template but it don't work, here is what I do in my template : <form method="POST" action="{{

排序和过滤时的慢查询

I'm using mongodb version 3.6.5. I would like to do a query on a collection, and then sorting it based on date. I work on a (what I think) is a pretty large dataset, currently 195064301 data in this

具有ActMaMeLails和复杂ActureCordRails的轨道(连接,在何处,和)

I would like to send an email when a project is registered (with a category and a eligible audience) to each user who has created an alert (with the same category and same eligible audience). MODEL

操作系统:银行家

Consider the following snapshot of a system: Allocation ABCD 2001 3121 2103 1312 1432 Available ABCD 4212 5252 2316 1424 3665 Max ABCD 3321 Answer the following questions using the banker’s

用TAN获取TMDAPI

I am trying to get series from the movie database in multiple languages. My goal is to update the object returned by the API to have the following keys : name_en, name_fr, overview_en, overview_fr I

React.js:如何从输入文件中设置背景数据?

I hope to set background image from input local file. But it occurs 'net::ERR_UNKNOWN_URL_SCHEME' error message. My input tag: <input accept="image/*" className="input_img" type="file"

为什么自旋槽的第一和第二图像不能永远相同?

i have a project in assembly that i have written, its a spin slot with 3 picture option. i dont know why' ive been sitting hours and couldn't find why the first and second image slot can't never be

创建自定义CAF接收器

I'm trying to create a custom CAF receiver with my own HTML5 video element and supporting library. Since I'm using my own <video> element, I'm setting up the PlayerManager instance as follows: /

检查是否有数字

I'm trying to make a code that will check if the user enters their age in letters and the code will not let the user go further until he enters only digits. My code: while(user_age.matches("!\\d+"))

猫鼬-如何选择一个特定的对象内的一个人口领域的猫鼬数组?

I have populated a virtual in Mongoose, the populated virtual will retrieve an array of objects. objects:{[name:'xxx',age:20],[name:'yyy',age:21],[name:'zzz', age:23]} How do I make it that it only

YouTube和Netflix如何向RoKu推出内容?

Using a mobile app, it is possible to "Cast" media from your mobile app to a Roku device on the same network. I do not understand the mechanism being used which allows a remote device (YouTube

i have tried to convert image RGB to HSV using cv2.cvtColor(image, cv2.COLOR_BGR2HSV) code. But i get an error like this: and the code just like this : Anybody can help me please? I really

方法没有重载匹配委托

I know there are other answers to these types of questions but they usually say that the parameters don't match up but I believe my parameters match up so I don't know why I'm getting the above-

有人能解释一下吗?

Can someone please explain this!! int main(){ int *x = (int*)malloc(sizeof(int)); printf("x = %d",x); printf("&x = %d",&x); printf("*x = %d",*x); } output: x = 13135888

Android FixBasic——神秘对象键

I tried pushing an object, extended by RealmObject, to my Firebase Database. And then these key-value pairs appeared out of nowhere: "loaded", "managed", and "valid". User Object Pushing User object

具有可配置的DIV中的行中断的jQuery字符计数器

I have the following jQuery code: $(document).on("input", "#textbox", function(event){ var characters = $(this).text().length; $(".character-counter").html(160 - characters); }); And the

无法在特定的WiFi网络上连接到Mongo

Using a MongoDB cluster with access from everywhere (0.0.0.0/0) and connecting through a Node.js driver. I also have Compass installed to analyze my data. The connection establishes on my work

滚动指示器

This code makes a scroll indicator (source: https://www.w3schools.com/howto/howto_js_scroll_indicator.asp) . Can you please help me figure out how do the variable scrolled is calculated here? Please

引用实体集合的聚合根

Following up on my previous post, I re-designed my model to make it more DDD oriented. I was probably missing a level of abstraction and I was also misusing domain services. In my invitation system

ZAPIER代码:触发多个Web挂钩

I'm trying to send multiple webhooks based on the number of items in a JSON array. I'm using a example from: how to trigger webhook from zapier code I tried it and it almost works as planned. I have

在线分析

I'm using Postgres's version 9.6 I want to perform an ANALYZE operation. Does ANALYZE operation has any impact on database performance or any other database action? Is that safe to perform ANALYZE

如果会话超时,网站上的用户的PHP -块操作

I'm doing a website in wich I wan a session timeout for inactivity of 2 minutes and if the timeout is reached, the operaion in the website must be blocked until the user do again the login. I wrote

如何使用CSS重新排列项目

I am working on a website but I have a big problem in arranging input items in my work I want to make the result like this photo but I found it coming like this photo and I do not know what is

有人能给我解释一下关于Coq Ide的一切吗?

This semester I started to learn logic in college, but just now the professor asked to learn about Coq. I tried to read the tutorials on the site, but I didn't understand quite much. Can somebody

在回音中播放短的连续音效

I'd like to play a sound effect (about 50 ms long) while printing some characters. However, this is far too slow both in script languages such as Bash and PHP: One sound effect every 500 ms or so,

具有嵌套对象角5的滤波器阵列

I'm trying to filter a list with many objects with the following structure: { "element1":{ "code":"12345", "location":"Location" }, "users":[ { "id":1, "name":"Name 1", "

SuffEd在超类中适用于子类吗?

Suppose System.setOut(new PrintStream(new File("/path/to/test.log"))) is used in a Java file. This file extends JFrame and has a JPanel. This JPanel then refers to many other files. If System.out.

PHP MS SQL计数行数为空

I'm trying to put together a table that displays events by date range. Which works with the code below. My next step is pagination, learning as I go. From everything I've read, I must get the number

从向量中移除n个最小元素,包括重复元素

I have the following vector: v = c(1,2,3,1,3,2,3,4,3,3,1, 5, 5,2) I would like to obtain the vector v_new = c(3,3,2,3,4,3,3,5,2,2) from which I removed the first smallest elements which are 1, 1,

为什么C中的数组[-1 ]返回0?

I was making an infixToPostfix method in C. and I found this thing. printf("%d\n", array[-1]); and the result is array[-1] == 0 but I don't understand why it has a value 0.

如何在Python中从GPG签名中获取指纹或密钥?

I'm using the phyton-gpg library to decrypt / encrypt. Validation while decrypting a mail works fine, but i'm also trying to check which key was used to created a PGP signature, for example when a

基于列表的重置索引

I want to reset the index based on a list Lets say i have dataframe like this list = ['RGB','RBR','RGD'] a b RBR 0 1 RGD 10 2 RGB 11 3 RGD 10 2 RGD 10 2 RGD

如何在Java中实现地图数据结构?

I want to implement a Map data structure, but I can't quite figure out what to do with underlying array structure. If I'm not mistaken, in Map each key is hashed and converted into an integer which

不能使用滚动查看器使用EnviutGrand行为

I try to use EventTriggerBehavior with ScrollViewer's ViewChanged event: <ScrollViewer x:Name="scrollViewer"> <i:Interaction.Behaviors> <core:EventTriggerBehavior EventName=

用用户定义字符串生成Java中的单词云

Can anyone give me the code for generating a word cloud using java with user-entered data? User will enter the string and then the word cloud will be generated. its urgent! Please help!

如何将变量中的冗长传递给消息()动作?

I need to set a message verbosity using a variable, e.g.: my_write(my_verb : message_verbosity) is { message(BUS, my_verb, vt.text_style(PURPLE, "txt txt txt")); // other logic

使用两个张量模型,其中一个用于推理,另一个用于训练。

I'm new to tensorflow and I'm trying to combine two models in one graph because I need one model's inference result to modify the loss function of the other model. I wrote the code and it runs without

NETWorkX 2.1节点索引

I have an old Networkx script that uses G.nodes().index(nnn) and need to run in Networkx 2.1. From the documentation is not clear how to convert or what is the equivalent.

长压检测

in this function,I want to achieve “if is long press,return flag=true,else open tile”.enter image description here but It is not working when I long press the tile. It is executing “open tile”. enter

字符串到数组节点JS JavaScript

Hi my current string is shown: 082759 078982 074470 066839 062069 062068 062029 062027 059304 059299 056449 056421 052458 050666 100530 078977 072967 072958 072957 066982 062864 062064 056506 052456

I setup following php script on first server to print all server values var_dump($_SERVER) from another server calling first server link $curl = curl_init(); curl_setopt_array($curl, array(

如何在类静态方法中获取对象发送器

It's my code snipper to print message public partial class Default2 : System.Web.UI.Page { public Default2() { DebugManage.ShowMessage(this, "hello"); } } public class

J.S.Express路由器和路由参数输入

I have this issue with a little program I'm coding to practice Express.js. I have a separate router wich I want to send a response depending on the route. So if a go to "/santiago", it have to send "

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