functionunset()

The tutorial says: 3. Use the function unset() to destroy the variable, but the code demonstration uses var_dump(); are unset() and var_dump() the same function? Address: //m.sbmmt.com /code/985.html

Rebecca 2022-10-19 11:04:45 0  1  1480

javascript - Confusion with a function declaration example in Elevation

"JavaScript Advanced Programming" Chapter 7 Functions, regarding the promotion of function declarations, there is such an example: {code...} The original text of the book says: On the surface, the above code means using a sayHi when condition is true. (); otherwise, use another definition....

淡淡烟草味 2017-06-26 10:50:47 0  2  700

javascript function

{Code...} Why does the above code output 1? After foo() is run, this is output. This is the window object. Does the getName in foo() also become a global function expression? And The following var getName is also a function expression; why the printed result is 1; foo,...

给我你的怀抱 2017-06-26 10:53:22 0  6  779

Why are the callback functions in my nested functions not working?

I'm using Socket.io's callback function like this: loadData(callback){varclient=newSyncClient(this.socket,this.project);this.client=client;//from my data function client.on("connected ",()=>{this.values=client.getData();callback(

P粉957661544 2024-03-19 20:32:38 0  1  408

php json_encode function encrypts a two-dimensional array and returns false!!!!!????

The php json_encode function encrypts a two-dimensional array and returns false!!!!!???? Why is this? Please give me some advice.

..... 2018-08-03 17:42:23 0  3  1565

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  739

Pass JS functions to WASM

I'm reading a good book on WebAssembly and I'm trying to learn how to import JS functions into wasm without using "glue code". This is a C file in which 2 extern functions externintjsClearRect(); externintjsFillRect() are declared; I then compile the c code to wasm using the following inst...

P粉081360775 2024-03-29 14:26:05 0  1  360

When javascript function declaration is promoted, will the function body be promoted together?

When javascript function declaration is promoted, will the function body be promoted together? If not, there are the following counterexamples: {Code...} If yes, there are the following counterexamples: {Code...} The first example shows that the function body is also promoted. If you follow this ide...

PHP中文网 2017-05-19 10:43:15 0  10  736

javascript - What does the following function writing mean?

A function defined in mutations in vuex calls {code...} {code...} in the component. My question is why there is no need to pass in the state parameter when calling the setCart function. Visually, if it does not If you pass the state parameter, the addCart function will automatically...

我想大声告诉你 2017-06-26 10:56:52 0  2  763

c++ - How to define a macro in C to obtain the function name through a function

How to define a macro to obtain the function name string, as follows: {code...}

阿神 2017-07-04 13:45:23 0  1  1429

javascript - Return value after function execution is completed

I would like to ask a question. I have a function that is relatively long and has a lot of logic. Then I define an empty array at the beginning of the function. The function of the function is to add elements to the array and then return the array. The problem I'm encountering now is that when the f...

怪我咯 2017-05-19 10:09:36 0  2  500

JavaScript: increment and decrement functions

I'm practicing my JavaScript skills, I've been mastering a simple incrementing counter function, I seem to have it figured out, so today I want to take that script to the next level and decrease the value, here is my question, When I click to add a number and then continue to click on the minus sign...

P粉761718546 2024-01-29 09:53:20 0  1  513

mysqli function

When using mysqli_num_rows() and other functions in the TP5.1 framework, an error will be reported. Can these functions not be used on TP?

林瑞程 2019-09-07 21:00:50 0  5  1389

Vue - Advanced Cropper (Uncaught TypeError: this.$refs.cropper.getResult is not a function)

I have a crop function for VueAdvancedCropper like this: crop(){const{canvas}=this.$refs.cropper.getResult();if(canvas){constform=newFormData();canvas.toBlob(blob=> {form.append('files[]',blob);//Perhapsyoushouldaddthesett

P粉054616867 2023-12-14 15:01:09 0  2  550

PHP nested function and anonymous function scope issues

{Code...} All functions and classes in PHP have global scope and can be defined within a function and called outside it, and vice versa. Why can function b obtain the local variables of function a by passing parameters? {Code...} Similarly, why does the anonymous function also obtain external variab...

phpcn_u1582 2017-05-18 10:45:34 0  1  642

How can a function within a function call a variable of the parent function?

var_dump(function_exists('b')); // false function a(){     $var = 123;     function b(){      &nb

喵~ 2022-12-05 19:48:12 0  0  636

javascript - How to specify a function function in the data attribute of html5?

Could you please specify a function function in the data-* attribute? For example, if I write like this, I will get an error formatter is not a function: {code...}

学习ing 2017-06-24 09:43:53 0  6  1071

PHP code to write a function to find the correlation coefficient?

PHP code to write a function to find the correlation coefficient?

时光正好 2018-04-12 19:02:34 0  0  919

javascript - Some questions about the implementation of extend function in js design pattern

In the JavaScript design pattern, the extend function is written as follows in Chapter 4.2.2 {code...} My question is about this function F. If the inheritance relationship is implemented in this way, then the prototype chain of the last object instantiated by subClass should be as shown below: But ...

typecho 2017-06-15 09:23:00 0  1  947

TP5.1 Implement search function in multi-table related query

Problems with the multi-table associated search function: The code is as follows: // Implement the search function $productName = Request::param('productName'); $storeName = Request::param('storeName'); if ( !empty($productName) &a

Jackie 2020-06-16 22:43:38 0  4  1924