Using adobe.target.getOffer , the result does not execute
Using adobe.target.getOffer, success or failure doesn't console.log anything. All relevant offers have been configured. Please see what the problem is, thanks a lot.
console.log('getOffer begin:') is printed, but the success or error console is not executed.

console.log("getOffer begin:");
adobe.target.getOffer({
"mbox": "locationA",
"success": function(offer) {
adobe.target.applyOffer({
"mbox": "locationA",
"offer": offer
});
console.log("Get offer success : ", offer);
},
"error": function(status, error) {
console.log('Error', status, error);
},
"timeout": 3000
});