javascript - Ask a process-related question, js?

Question

Declare an empty array, open four processes and push values ​​into the array at the same time. What is the order in which the pushes are entered?

Answer 1

I have never heard of the saying that js has multiple processes, and it is impossible to modify an array at the same time. You can post the code for other experts to take a look

Answer 2

You should write it in NodeJS

Answer 3

A simple experiment is as follows. When multiple processes (tasks) operate, the value of the array depends on the last process. I use 2 setTimeout and 1
setInterval to simultaneously operate an array, and push into three values ​​​​1, 2, and 3 respectively. The final result is:

[1, 2, 3, 3, 1, 1, 3, 1, 1, 3]

There is a clear explanation in Ruan Yifeng’s article: Single thread means that all tasks need to be queued, and the next task will not be executed until the previous task is completed. If the previous task takes a long time, the next task will have to wait. ；View original text

Answer 4

Just test it and you will know. Print this array every time the push is successful