javascript - How to bind a callback function to a variable

Can Javascript bind a callback function to a variable? That is: when the value of this variable changes, the callback function is triggered and the content in the callback function is executed.

高洛峰 2017-06-26 10:53:29 0  3  921

Questions about defining variables

Questions about defining variables Questions about defining variables

phpcn_u81338 2017-12-24 00:35:38 0  2  1280

What is the difference between functions and variables?

What is the difference between functions and variables? Why appear together? Functions and variables, all of them are faint.

武汉蜗牛 - Jack Li 2019-09-08 11:38:24 0  8  2486

javascript - How to get the variable value in the variable in the function from the outside

How to get the variable value inside the function from outside the function? {code...}

曾经蜡笔没有小新 2017-05-18 10:58:18 0  5  698

"Converting JavaScript Variables to PHP: JavasScript variables converted to PHP"

So I'm wondering if there is a way to pass Javascript variables into PHP. I'm making a script that gets a location from a website and inserts this location into MySQL to get some analytics data. This is my Javascript function: functiongetPosition(position){constlatitude=position.coords.latitude;cons...

P粉904405941 2023-09-18 11:50:08 0  1  502

Convert 1 digit number to HH:mm:ss format in PHP

How to convert 1 digit number to full time representation in PHP, for example: 012...171819, to 00:00:00, 01:00:00, 02:00:00...17:00:00 , 18:00:00, 19:00:00. I tried using strtotime() and date() functions but didn't really grasp their usage.

P粉512729862 2023-08-06 12:18:43 0  1  570

What is the difference between directly assigning a function to a variable and referencing a function?

What is the difference between directly assigning a function to a variable and referencing a function? For example: Fragment 1 and Fragment 2 Fragment 1 {Code...} Fragment 2 {Code...} The function in onclick in Fragment 1 allows access to the variables in fn, but the onclick function in Fragment 2 d...

大家讲道理 2017-05-19 10:33:08 0  2  549

php - Numbers to text

How to quickly convert numbers into text, for example, 1 => one, 2=> two, ..., 15=》Fifteen. What I am currently thinking about is to save Chinese characters into an array {code...} However, This is too troublesome. How to convert input numbers into Chinese? Is there an easier way?

PHP中文网 2017-06-13 09:22:16 0  2  1014

php - Questions about defining variables

I am a beginner. I used phpstorm to write the following code at home. The code that runs without error is as follows: <?php$x=5; // Global variable function myTest(){ {code...} }myTest( );echo "<p>Test function external variables:<p>";echo "Variable ...

过去多啦不再A梦 2017-06-07 09:23:08 0  5  741

javascript - js large number to binary

There is a very large string of decimal numbers. How to convert it into a binary string? Since the number is very large, there is no way to convert it into a number and put it in the variable toString(2)

仅有的幸福 2017-05-19 10:14:41 0  6  728

You cannot use the results of a function in other functions

I have two functions convertToBase64(file) for converting the file addData(values) for sending the converted file. But the result of the second function is always undefined. how to solve this problem? asyncfunctionconvertToBase64(file){constfileReader=newFileReader();fileReader.onload=()=>{consts...

P粉087951442 2024-04-01 13:13:20 0  1  596

How to convert jpg to webp format in php

jpg takes up too much space and the web page is displayed too slowly. I want to convert the format to webp format. Are there any functions in php that can perform format conversion?

扔个三星炸死你 2017-07-04 13:46:11 0  1  1160

MySQL automatically convert/convert string to number?

Does MySQL automatically convert\convert strings to numeric values? How does this conversion work? '1234'=1234?'1abc'=1?'Text'=1? How will this query be interpreted given that units.id is of type bigint? SELECTtable.*FROMtableWHEREid='text'

P粉336536706 2023-10-24 08:36:29 0  2  720

Can I use variables instead of closure functions?

You can use variables instead of closure functions? For example, variables can also be used in arrays. Why is closure recommended?

梦游天下 2018-04-15 22:38:44 0  0  1232

class variables in python

Are variables in classes the same as self.var1 in functions? Why are they the same? {Code...} After the function is run, {Code...} Why is the class variable var1 self.var1? What is the reason?

phpcn_u1582 2017-06-28 09:24:34 0  1  791

JQuery - On-the-fly calculations/conversions in dynamic tables

I do have a dynamic HTML table (rows can be added) and I "just" want to read the value in liters and convert it to USG when the user enters the value (get the value in liters, convert it Convert and put it in the USG input field). Dynamic HTML table I've created a function that executes af...

P粉364642019 2024-04-03 12:38:26 0  1  547

Enhance function access to external variables

I have an array outside it: $myArr=array(); I want my function to access the array outside it so that it can add values ​​to it functionsomeFuntion(){$myVal=//someprocessingheretodeterminevalueof$myVal$myArr[]= $myVal;}How to give a variable the correct scope to a function?

P粉165522886 2023-10-16 17:43:35 0  2  487

javascript - How to assign a value to a variable outside a function inside a function?

As above, I cannot assign a new value to g. I want to write a fn function that can assign values ​​to external variables at will. The actual requirements are as above. I want to assign the instantiated variables to external variables.

淡淡烟草味 2017-05-19 10:39:36 0  5  2686

javascript - Function declaration and variable declaration priority

{Code...} I previously thought that if a function and a variable have the same name, function declaration promotion will overwrite variable declaration promotion. Then I tested the following code {Code...} console.log(f) will output different outputs in different positions. Who overrides who? Or is ...

学习ing 2017-06-12 09:28:15 0  7  883

Call variables outside plugin files and inside function files

Calling variables outside the plugin file and inside the function file; I use the YITH WooCommerce comparison plugin and I put the file containing the code relevant to my question

P粉798343415 2023-07-17 18:42:42 0  1  459