如何通過對象的數組循環，這是另一對象的數組中 - 的JavaScript

Question

我的數據看起來是這樣的：

var songs = [ 
    {Object1: [{Obj1: songId}]}, 
    {Object2: [{Obj1: songId}]} 
]; 

什麼是搶到最好的方式，所有的songId從整個歌曲的陣列？

Answer 1

var songsIdCollection = []; 

songs.forEach(function(wrappedSongData) { 
    //{ Object1: [ {Obj1: songId} ] } 
    wrappedSongData.forEach(function(songIdMaps) { 
     //[ {Obj1: songId} ] 
     songIdMaps.forEach(function(songIdMap) { 
      //{Obj1: songId} 
      songsIdCollection.push(songIdMap.Obj1); 
     }); 
    }); 
}); 

Answer 2

一些迭代會做。用最少的代碼

var songs = [ 
 
     { Object1: [{ Obj1: 8 }] }, 
 
     { Object2: [{ Obj1: 99 }] } 
 
    ], 
 
    songId = []; 
 

 
songs.forEach(function (o) { 
 
    Object.keys(o).forEach(function (k) { 
 
     o[k].forEach(function (a) { 
 
      songId.push(a.Obj1); 
 
     }); 
 
    }); 
 
}); 
 
document.write('<pre>' + JSON.stringify(songId, 0, 4) + '</pre>');