for (let iTuno Bitteri < len; iPP) {
user_code = "";
console.log("111");
a.find()
.then((res)=> {
for(let j=0;j<len;jPP){
b.find()
.then((res)=> {
})
}
})}
if you want to finish checking and executing async before executing the next for loop, it will never work.
add a layer to judge if (res) before the next for loop, and then for loop in if
let promise = Promise.resolve();
for(let i=0;i<len; iPP) {
promise = promise.then(() => {
user_code = '';
return a.find().then((res)=> {
let innerPromise = Promise.resolve();
for(let j=0;j<len;jPP){
innerPromise = innerPromise.then(() => {
return b.find().then((res)=> {})
})
}
})
});
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