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why referencing non-existent property of an object in javascript doesn't return a reference error?

If I try to reference a non-existent variable, I get ReferenceError in JavaScript. Why referencing a non-existent ... a) undefined //no error See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why is class a reserved word in JavaScript?

I am planning to implement class inherit interface using JavaScript. class is the perfect word as the name of the ... since it never uses it)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why can't I change only a single element in a nested list in Python

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why $(window).load() is not working in jQuery?

I'm learning jQuery using visual studio and testing my code in Chrome browser. This is my HTML code <!DOCTYPE ... why my browser doesn't alert "window Loaded"? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why I only get a clearcase version 0?

Normally, the first committed version should start from 1. Version 0 is identical with branch point. But now I ... it warned me that the branch already created. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why doesn't java send the client certificate during SSL handshake?

I'm trying to connect to a secure webservice. I was getting a handshake failure even though my keystore and ... if anyone can clarify this one for me. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why java polymorphism not work in my example

I have these 4 java clases: 1 public class Rect { double width; double height; String color; public Rect( ) { ... as CRect (sub class) with "Blue" color ? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why do we use 10.0.2.2 to connect to local web server instead of using computer ip address in android client

We normally use 10.0.2.2:(port number) in the url to connect to the local web server,but we should use the computer's ip ... 0.2.2 Then why do we use 10.0.2.2? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why is the meaning of macro `-ENOSYS` in glibc?

I am studying pthread_mutex_lock, and find out pthread_mutex_lock will finally calls a macro lll_futex_timed_wait() in glibc( ... /why-is-the-meaning-of-macro-enosys-in-glibc...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why is an interface type not found is a Typescript file

Edit: I am updating this question as originally I misunderstood what *.d.ts files are used for. The problem is either ... /why-is-an-interface-type-not-found-is-a-typescript-file...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why do I get syntax error for else statement in python 2.7?

I used the code below in python 3.9 and it runs with no problem at all but when I use it in 2.7 version it ... 65859875/why-do-i-get-syntax-error-for-else-statement-in-python-2-7...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why does viewport 700px not fit 700px website on mobile?

I am developing a website (mostly) without responsive adaptations. I made it so that it looks the same on PC ... /65862688/why-does-viewport-700px-not-fit-700px-website-on-mobile...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why does input cursor go to the start in textfield? flutter

TextField( controller: tecTitle, onChanged: (String title) { this.title = title; offset: this.title.length; }, ... why-does-input-cursor-go-to-the-start-in-textfield-flutter...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why self.method_name cannot access private method ? where as only private method_name can in any method can access private method in ruby

class Person def one @var = 99 self.two end private def two p @var end end p=Person.new p.one when i ... -self-method-name-cannot-access-private-method-where-as-only-private-method...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why localhost refused to connect xampp on macos big sur 11

I downloaded Visual Studio code 3 for Macos and then xampp. The xampp terminal is showing 2 ports: 8080 and 8443. ... /why-localhost-refused-to-connect-xampp-on-macos-big-sur-11...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why cron job stoped in new year 2021 in laravel

every thing works fine till 31 decemeber 2020 and in new year my cron job stoped working i dont know what happend i ... /65870594/why-cron-job-stoped-in-new-year-2021-in-laravel...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why there is no triangle button using CodeBlocks when I am debugging?

You can see the yellow triangle signal in line 9. And this is a correct example. But when I am try to debug ... why-there-is-no-triangle-button-using-codeblocks-when-i-am-debugging...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why pug is not able to render images with links stored in mongoDB link

I am trying to display the book images with images stored on my computer and their links in mongoDB atlas. When all ... -not-able-to-render-images-with-links-stored-in-mongodb-link...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why LSTM fail me on this time series regression problem?

I am trying to regress one dependent y from 114 independents x at each time step like below digram. The problem ... 65885799/why-lstm-fail-me-on-this-time-series-regression-problem...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why compiler kotlin with error message Conflicting overloads problem

I am a beginner in Kotlin. I have a kt file that no class function name "test1" which is ... /65887884/why-compiler-kotlin-with-error-message-conflicting-overloads-problem...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why the ROC of Naïve Bayes that I plotted, does not start from zero?

I want to plot the Naive Bayes ROC curve, but it doesn't start from zero! how can I solve the problem? also, ... the-roc-of-na%c3%afve-bayes-that-i-plotted-does-not-start-from-zero...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why my angular index.html name changed to index.original.html after using ng deploy for firebase?

Hi, I want to deploy my angular universal app in firebase earlier everything was working perfectly but now after using ... -name-changed-to-index-original-html-after-using-ng-dep...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why INTERFACE_INCLUDE_DIRECTORIES error appears when adding FILE name. Cmake

how come cmake does not give an error when not specifying FILE name? I understand that when FILE name ... -interface-include-directories-error-appears-when-adding-file-name-cmake...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why flutter application trying to read clipboard all the time?

which widget in flutter is reading the clipboard? it bother users. in some android versions in china mobiles, ... /why-flutter-application-trying-to-read-clipboard-all-the-time...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why can i not upgrade a chain runtime as per the Substrate tutorial?

I followed the instructions at https://substrate.dev/docs/en/tutorials/upgrade-a-chain/ to test out upgrading a ... i-not-upgrade-a-chain-runtime-as-per-the-substrate-tutorial...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why the SmartRefresher does not work in flutter

Now I am using SmartRefresher to refresh my app when pull down article list, I add pull_to_refresh dependencies ... /65931277/why-the-smartrefresher-does-not-work-in-flutter...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why i can not run program on my linux(qemu simulate arm32,and start a linux os)

【1】, I have a linux os environment, which is based on arm32(qemu similute). 【2】, There are two file in / ... -not-run-program-on-my-linuxqemu-simulate-arm32-and-start-a-linux-os...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why can't I read this file in python?

lines = [line.rstrip() for line in open(r"C:UsersmagshimimPycharmProjectsasaf_avitalwords.txt")] for line in lines: if ... /questions/65903517/why-cant-i-read-this-file-in-python...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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