javascript - 具有类别的项目数组到具有项目的类别

Question

如何将带有类别的项目数组转换为以项目为对象的类别？

输入项目数组

var items = [
    {
        itemId: 111111,
        title: 'Item-1',
        sellerName: 'seller-1',
        category: 'Electronics, Fitness'
    },
    {
        itemId: 222222,
        title: 'Item-2',
        sellerName: 'seller-2',
        category: 'Cars'
    },
    {
        itemId: 333333,
        title: 'Item-3',
        sellerName: 'seller-3',
        category: 'Electronics'
    },
    {
        itemId: 444444,
        title: 'Item-4',
        sellerName: 'seller-4',
        category: 'Cars, Bikes'
    }

]

//Result
    var result = {
        Electronics: [
            {
                itemId: 111111,
                title: 'Item-1',
                sellerName: 'seller-1' 
            },
            {
                itemId: 333333,
                title: 'Item-3',
                sellerName: 'seller-3'
            }
        ],
        Cars: [
            {
                itemId: 222222,
                title: 'Item-2',
                sellerName: 'seller-2'
            },
            {
                itemId: 444444,
                title: 'Item-4',
                sellerName: 'seller-4'
            }
        ],
        Bikes: [
            {
                itemId: 444444,
                title: 'Item-4',
                sellerName: 'seller-4'
            }
        ],

        Fitness: [
            {
                itemId: 111111,
                title: 'Item-1',
                sellerName: 'seller-1'
            }
        ]
    }

我尝试了这段代码，但没有以我想要的格式给出确切的结果:

function convertItemsToCategories(items){
var categories = {};
var itemarr = [];
for(var i =0; i < items.length; i++){
  //categories.push(items[i].category.split(','));
  var singleCategory = items[i].category.split(',');
  //categories[items[i].category] = items[i];
  singleCategory.forEach(function(catname){
    if(catname == items[i].category)
     itemarr.push(items[i]);
     categories[catname] = itemarr;
  });

  console.log(singleCategory);
}

console.log(categories);
}

convertItemsToCategories(items);

Answer 1

singleCategory.forEach(function(catname){
  if(catname == items[i].category)
   itemarr.push(items[i]);
   categories[catname] = itemarr;
});

这部分代码不正确。 catname 是用“,”分隔的“类别”，category 是原始类别。而且你不断地推送 itemarr 中的项目而不清除它，所以结果非常奇怪。

请检查此jsfiddle .