Why when the destructor of the parent class is defined as virtual, delete pTest2 releases the resources of Derived, otherwise it can only release the resources of Base, and delete pTest1 can release the resources of Derived and Base class Base { public...
At the end of the php program, the order in which destructors are executed, why is the object created first and executed last? and the destructor is triggered when an Object is destroyed in the Bird blog: C, " " . PHP, " " HastTable. , " " Has...
< H2 > problem description < H2 > there is an A parent class use A; class B extend A { public function __construct() { } public function index() { echo "Method: index"; } } $a = new A; $a->index(); ca...
I wrote it according to the example given on the official website. After writing it, I found that Android works, but iOS does not. After searching for a long time, I found that "when the page loads, this element will get focus (note: autofocus does not ...
when the list method returns in a controller, it returns this depending on whether the asynchronous request is made: "users list::-sharpmainContainerRepleace " does not understand what this is written. Solve this list front end is an ajax request, an...
A laravel code. I m not sure what it means and what it does. Please explain it. Thank you. $token = $user->createToken( Token Name )->accessToken; ...
function speakA(){ alert(this.name); alert(this.n); speakC(); } function speakC(){ this.name = "C"; this.n = "ddd"; } speakA(); output is C undefined Why can the alert statement output C before the this.name as...
I hope to put the function of uploading pictures uploadImage.array ( file , 30) after the function of inserting into the database pool.getConnection . How can I implement ? short version app.all( other images save , uploadImage.array( file ,...