[JavaScript]Promise
getCart(){
return new Promise((resolve,reject) => {
const url = 'url';
fetch(url)
.then((response)=>{
if (!response.ok) {
throw new Error();
}
return response.json();
})
.then((json)=>{
resolve(json);
})
.catch((error)=>{
reject(error);
});
});
}
this.getCart()
.then((json)=>{
})
.catch((error)=>{
});