topic description

you need to print in the desired order, as Synchronize does.

sources of topics and their own ideas

this is a simplified problem of actual requirements

related codes

/ / Please paste the code text below (do not replace the code with pictures)

for (let i = 0; i < 10; i PP) {
    setTimeout(() => {
        console.log(`${i}`);
    }, 1000);
    for (let j = 0; j < 5; j PP) {
        setTimeout(() => {
            console.log(`${j}`);
        }, 1000);
    }
}

what result do you expect? What is the error message actually seen?

I hope the following results can be printed out, like Synchronize, with an interval of 1 second each time

this is the outer layer 0
, this is the inner layer 0
, this is the inner layer 1
, this is the inner layer 2
, this is the inner layer 3
, this is the inner layer 4
, this is the outer layer 1
, this is the inner layer 0
, this is the inner layer 1
, this is the inner layer 2
, this is the inner layer 3
, this is the inner layer 4
.