使用的GroupBy使用嵌套的JSON對象

Question

我想這組JSON underscore.js使用的category

[{ 
"brand": "Brand3", 
"category": { 
    "popularity_index": 7, 
    "BroadCategory ": "BroadCategory4", 
    "MainCategory": "MainCategory410", 
    "GeneralCategory": "GeneralCategory41" 
}, 
"description": "colonialism", 
"discount": 17, 
"id": 9 
}, { 
"brand": "Brand2", 
"category": { 
    "popularity_index": 5, 
    "BroadCategory ": "BroadCategory2", 
    "MainCategory": "MainCategory210", 
    "GeneralCategory": "GeneralCategory21" 
}, 
"description": "desc2", 
"discount": 15, 
"id": 2 
}] 

我通過underscore.js - _.groupBy nested attribute去BroadCategory屬性，但是這裏面的JSON數組location

我試着像這樣：

var grpArray = _.groupBy(products, function (element) { 
    return element.category.BroadCategory; 
}) 

但它不工作。爲什麼我無法訪問BroadCategory？

Answer 1

你必須修剪空間 「BroadCategory」

"BroadCategory ": "BroadCategory2", 

更改爲：

"BroadCategory": "BroadCategory2", 

OR：

_.groupBy(products, function (element) { 
    return element.category['BroadCategory ']; 
})