如何使用入門鍵從JSON對象中構建數組？

Question

碼

var q = JSON.parse('[{"15": {"bUrl": "https://example.com/r2359","name": "Ninpo","url": null,"desc": null,"series": [{"title": "Nana","id": "6308","authors": ["Author1"]}]}}, {"390": {"bUrl": "https://example.com/r2667","name": "Sanpo","url": null,"desc": null,"series": [{"title": "Baba","id": "6498","authors": ["Author2"]}]}}]');

var yy = [];
for (i = 0; i < q.length; i++) {
    yy.push(q[i]);
}
console.log(yy);

我正在嘗試訪問字符串“ 15”和“ 390”，但是循環訪問它們只是為我提供了每個組的整個對象。 如何僅提取數字字符串，以便可以使用它們構建數組？

Answer 1

您可以在對象上使用Object.keys來獲取密鑰作為數組，並結合使用Array#reduce和Array#concat將密鑰平面映射到單個數組中。

 var q = JSON.parse('[{"15": {"bUrl": "https://example.com/r2359","name": "Ninpo","url": null,"desc": null,"series": [{"title": "Nana","id": "6308","authors": ["Author1"]}]}}, {"390": {"bUrl": "https://example.com/r2667","name": "Sanpo","url": null,"desc": null,"series": [{"title": "Baba","id": "6498","authors": ["Author2"]}]}}]'); console.log( Object.keys(q[0]) ) console.log( q.reduce((acc, x) => acc.concat(Object.keys(x)), []) ) 

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