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javascript - The shift() method of js is invalid?

As the title says, the code is as follows: {Code...} Array-like objects cannot call the shift method API?

滿天的星座 2017-07-05 10:45:34 0  4  1204

Is it possible that .shift() returns undefined?

I'm writing a TypeScript function and my IDE tells me that the result of .shift() may be undefined, which results in more type warnings... Here's the code: functionaccumulateProofs(proofs:Proof[], requiredAmount:Number,strategy:'middle'|'ascending'|'descending',):Proof[]{constresult:Proo

P粉461599845 2024-02-03 19:55:25 0  1  497

Why is ctrl-shift-v pasting so slow under vim?

When using Ctrl-Shift-v to paste the system clipboard content in vim insertion mode, the speed is extremely slow. Sometimes a paragraph of text is pasted in several sentences. If too much content is pasted, it may even get stuck; while in normal mode Next, there is almost no delay when using "+...

習(xí)慣沉默 2017-05-16 16:42:21 0  1  978

Create a function that alternates between .pop() and .shift()

I'm having beginner's difficulty with my JS exercises. I need to write a function popAndShift(). This function first prints the contents of arrays array1 and array2. Then, alternately remove elements of array2 using the .pop() and .shift() methods (starting with .pop()) and add the removed values ??...

P粉403804844 2023-09-11 21:30:34 0  1  628

What is the return value after pop() push() unshift() shift() operates on an array in Javascript?

Recently I was reading "The Definitive Guide to JavaScript (6th Edition)", translated by the Taobao team. See the chapter on arrays to introduce some methods of JS arrays. pop() push() treats the array as a stack, and then deletes and adds array elements at the end of the array. unshift() ...

女神的閨蜜愛上我 2017-06-12 09:25:04 0  2  1692

Ctrl+shift+J didn't cut out the sky. Why?

After using the Polygonal Lasso tool to circle, press CTRL+J. The result is just a copy of the selected layer, without cutting the original image. Please help me explain what is going on. Is it where I set it? .

P粉693705174 2022-09-08 23:07:16 0  0  1009

Multi-line comment problem in php

What is the shortcut key for multi-line comments? CTRL+shift+/ No, it’s not a shortcut key conflict.

P粉899023144 2022-04-17 18:28:45 0  1  1070

animation stopped

stop(false,true) Why the right shift is completed immediately, but the font size is not completed immediately

飛 2019-01-13 22:15:24 0  0  1148

javascript - Solve the following code. . How to understand?

{Code...} I learned that>>signed right shift, why do we need parseInt(,16)? >>Isn’t it right shift of binary data? . Then parseInt no matter what base it is converted into. The binary data should remain unchanged. Why move 16 bits. . Isn't 'FFFFFF' 6bytes 48bit...

大家講道理 2017-05-19 10:15:40 0  2  541

UISearchBar offset issue with UISearchController

{Code...} Oh my god, why is _UISearchBarContainerView shifted upward by -44, causing the searchBar inside to also shift upward.

習(xí)慣沉默 2017-05-02 09:33:41 0  0  1464

php - Image color value >> 8 & 255 Why should the bit be equal to 255 after shifting?

{Code...} This code {Code...} What I don’t understand is why the AND 255 operation is required after the shift.

某草草 2017-05-16 13:07:44 0  2  746

The novice uncle is here again to ask for advice.

I have a simple understanding of the concepts of original code, inverse code, and complement code, but when I encounter the bitwise "AND, OR, NOT", I almost explode on the spot~ When I encounter the left shift and right shift, I pull out my hair in fistfuls. Ah~~~ Can anyone give a brief s...

本善之初 2019-08-26 14:44:15 0  2  1566

Shortcut keys conflict with input methods

When adding Ctrl+shift+N to create a new layer, the input pharaoh appears, and the new layer cannot be quickly created.

P粉693705174 2022-09-07 14:27:59 0  1  1098

zend-framework - What is the shortcut key to align source code in zend studio?

Select the code, ctrl+shift+f does not work. I haven't found any configuration items for zend studio10.6.0 after searching for a long time.

淡淡煙草味 2017-05-16 16:43:20 0  1  525

How to efficiently search and replace text in multiple files in vim

Just like sublime's ctrl+shift+f, is grep a more reliable way? But the search feels very slow, not as fast as sublime. I use gvim

ringa_lee 2017-05-16 16:36:00 0  2  726

PHP-MYSQL-H5 schedule problem

Each employee saves the shift schedule for the three months before and after the current month. How to design the database and what is the implementation process?

肺腑冰凍，作啞裝聾。 2018-06-05 16:35:14 0  0  1616

How to search all files in a directory in vim

In a general editor, you can use ctrl+shift+f to conveniently search all files in a certain directory (or project). How to achieve this in vim?

怪我咯 2017-05-16 16:40:37 0  5  873

Resolve conflicts between VS Code automatic formatting (alt+shift+F) and VueJs default formatting (npm run lint) rules

I just initialized a VueJs project: npminitvue@3.Needtoinstallthefollowingpackages:create-vue@3.3.2Oktoproceed?(y)yVue.js-TheProgressiveJavaScriptFramework√Packagename:...no-interrupts√AddTypeScript?...Yes√AddJSXSupport

P粉539055526 2023-09-02 17:11:25 0  1  602

How to calculate date difference (function used to calculate shifts) during daylight saving time adjustment?

I have the following function for determining which shift is working on a given date. publicstaticfunctiongetShift($date,$startDate,$sequence){$daysDiff=floor((strtotime($date)-strtotime($startDate))/(60*60*24));$sequenceArray=explode(',',$ sequence);$key=($days

P粉919464207 2023-09-16 00:03:57 0  1  650

linux - How to use copy and paste in Ubuntu command window?

I copied a URL in the browser of the virtual machine and wanted to install the software. How do I paste the URL I just copied in the command line mode? Ctrl + Shift + V does not work.

給我你的懷抱 2017-05-16 13:18:03 0  4  1775