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What does the new operator do?

Can you briefly introduce the function of new operator?

移动用户-4952586 2020-02-02 20:48:23

JavaScript bitwise NOT operator (~)

See the lottery code {code...} of <TFC2017/> Why can the ~ operator round numbers?

伊谢尔伦 2017-06-28 09:29:08

javascript - problem with an operator operation

If neither n nor guard exists, n==null is true, and guard is undefined in the ternary operator. If the Boolean value is converted to false, it will be equal to n, that is, undefined is returned in the end. But why does it return 1? {code...}

怪我咯 2017-05-19 10:33:27

javascript - Is... in the following code a spread operator or an operation operator? What does it mean to write like this?

Code in vuex {code...} What does... in front of mapState mean? What is the difference between adding this and not adding this? I have seen the relevant documentation of the spread operator and the operation operator, but I still don’t quite understand it. I would like a more detailed explanation. .

漂亮男人 2017-06-26 10:52:17

How to convert 'u00e9' to utf8 characters in mysql or php?

I'm doing data cleaning on some messy data that I'm importing into mysql. The data contains "pseudo" unicode characters that are actually embedded in the string, like "u00e9" etc. So a field might be.. "Jalostotitlu00e1n" I need to rip off that awkward 'u00e1n' and repl...

P粉704196697 2023-08-24 20:34:18

How to implement delay queue when operating kafka in php

For example: How to implement a delay queue using PHP when operating Kafka? I know that Java can implement this delay queue, but I want to know if the same function can be achieved using PHP.

U2  2022-09-15 16:12:34

PHP operates mongodb to query two tables

The official commands can be queried, but who knows the actual PHP operation?

Sinker 2018-07-31 15:14:20

Are there operators in RxJava that perform different functions based on conditions?

New to rxjava, I searched and found no relevant operators (I just didn’t find them). I want to judge the obtained data in onNext and refresh different interfaces according to the type carried by the data in the activity. The current method is to use onNext. The switch + case code is ugly. I would li...

PHPz 2017-05-16 13:34:43

node.js - When node operates mysql, why do some query strings use backticks `` and some use double quotes ""

When using node to operate mysql, why do some query strings use backticks `` and some use double quotes ""? What is the significance of this? I hope the doubts can be answered {code...}

曾经蜡笔没有小新 2017-05-31 10:39:18

PHP automatically performs the login operation after discovering that the login has expired, and then continues the previous step.

Conditions: There is a third-party website, and every step of the operation needs to be logged in. Now I have built a simple front-end page and used PHP to make a springboard in the middle. Process: Every request on the page I built is transmitted to the PHP springboard through ajax, and then the PH...

暖暖橙 2022-06-13 15:06:16

angular.js - angular1.x, conflict between dom operation and ng data operation

http://codepen.io/anon/pen/JXogBj?editors=1010 As shown in the above code, click the 1:dom operation and then click the 2:ng operation. The value of the label does not change unless you click the 3:ng operation and then click 2:ng operation. Is there any way to make the 2:ng operation always take ef...

仅有的幸福 2017-05-15 16:59:06

javascript - http://www.XXXX.com/#/theme, what role does the # symbol play in such a path? Is there no refresh? Element locator?

It seems that when switching between different interfaces, the page does not refresh. The rule displayed in the url address is /#/. I am very curious about the effect of such a rule, no refresh? Or element locator?

伊谢尔伦 2017-06-08 11:01:44

How is this voting option adding operation named .php?

How is this voting option adding operation named .php?

盛情不旧゛ 2019-05-02 18:32:09

python - How to understand the operation of converting RGB values to characters in PIL

{Code...} How to understand the data passed into the get_char function by get_char(*im.getpixel((j,i))), what variable does this belong to, and what is the operating principle of this function?

高洛峰 2017-06-12 09:26:11