我正在使用 api 來獲取回應陣列，我試圖將“id”映射到“quiz_records”陣列下，但它回傳未定義。我認為我的代碼是正確的。這是我的嘗試。
大批
"quizRemarks": [
{
"id": 160,
"user_id": 1,
"quiz_id": 18,
"module_id": 29,
"number_of_correct_answers": 2,
"created_at": "2021-10-15T03:52:52.000000Z",
"updated_at": "2021-10-15T03:52:52.000000Z",
"time_started": null,
"time_finished": null,
"remarks": 1,
"quiz_records": [
{
"id": 27,
"user_scores_id": 160,
"question_id": 2,
"user_answers": "DriverPH",
"remarks_correct_incorrect": "1",
"created_at": null,
"updated_at": null,
"question_text": "What is the name of this application?"
},
{
"id": 28,
"user_scores_id": 160,
"question_id": 2,
"user_answers": "Red",
"remarks_correct_incorrect": "1",
"created_at": null,
"updated_at": null,
"question_text": "What traffic light color tells you to stop before the intersection?"
}
]
}
]
ts
this.quiz_records = res['quizRemarks'].map(res => res['quiz_records'].id);
console.log(this.quiz_records);
uj5u.com熱心網友回復：
quizRemarks是一個物件陣列，其中包含quiz_records. 嘗試使用此方法獲得的平面串列ids的quiz_records：
this.quiz_records = [];
this.quizRemarks.forEach(remark => {
this.quiz_records.push(...remark.quiz_records.map(rec => rec.id));
});
uj5u.com熱心網友回復：
下面的代碼將作業----
this.quiz_records = res['quizRemarks'].map(res => res['quiz_records'].map(r => r.id));
uj5u.com熱心網友回復：
您想從陣列中獲取 id 屬性，這是不可能的。您可以使用嵌套 map flat()陣列方法。
const result = res['quizRemarks'].map(remarks => {
return remarks['quiz_records'].map(record => record.id);
}).flat();
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/324128.html