I want to put the front of the checkBox array to the back end, but the back-end always can't get the array of data, whether also step between analytical data?

 
///front-end code added to the list of orders 
Let postcartData=({https://bbs.csdn.net/topics/this.$qs.stringify 
Cart: this checkBox, 
}}, {indices: false); 
This $axios ({
Method: "post", 
Url: '/server/API/buy/add', 
Data: JSON. Stringify (postcartData), 
Headers: {

'Authorization' : window. LocalStorage [' login '] 
}, 
Params: {
Id: this $store. Getters. Cart 
} 
}). Then ((res)=& gt; {
The console. The log (' [] added to the list of orders debugging + JSON. Stringify (postcartData)) 

This. $toast. The message (' create successful order '); 
return false; 
}). The catch (()=& gt; {
This. $toast. The message (' failed to create an order); 

return false; 
}) 

 
/* * 
* the backend interface code 
* order list is added to the array cart 
* interface:/API/buy/add? Id=adasasdadas 
*/
The router. Post ("/add ", 
Passport. Authenticate (JWT,} {session: false), 
Async CTX=& gt; {

Const id=CTX. Query. Id; 
Const buys=await buy. FindById (id); 
Const newCart={
Title: CTX. Request. Body. The title,//to get 
Img: CTX. Request. Body. Img//to get 
Price: CTX. Request. Body. Price,//to get 
Num: CTX. Request. Body. Num,//to get 
Date: CTX. Request. Body. The date, 
}; 
Buys. Cart. Unshift (newCart); 
Const buyUpdate=await buy. FindOneAndUpdate (
{_id: id}, 
{$set: buys}, 
{new: true} 
); 
CTX. Body=JSON. Stringify (buyUpdate); 
The console. The log (JSON. Stringify (CTX) request) body)) 
} 

);