基于属性javascript的克隆对象

Question

我正在像这样在JSON中获得一组对象

[ 
    { name: "Doc 1", 
      product: ["product 1", "product 2"],
      type: ["type 1", "type 2"] 
    },
    { name: "Doc 2", 
      product: ["product 1"],
      type: ["type 1"] 
    },
    { name: "Doc 3", 
      product: ["product 2"],
      type: ["type 2"] 
    }
    ...
]

我需要首先为对象的每个产品克隆对象（因此我将有2个Doc 1实例），然后我要根据产品对对象进行分组（这将给我另外2个对象），然后根据分组会给我另外2。

最初，我们只是基于产品进行分组，但是随后我们发现我们的文档具有与之相关的多个产品，因此我们需要转换原始产品。

如何将每个产品的每张卡克隆到新阵列？

可以预料，在这个简单的实例中，最终的对象组看起来像是Doc 1是唯一的副本，因为它与产品1和2相关联。

[ 
  { name: "Doc 1", 
    product: ["product 1", "product 2"],
    type: ["type 1", "type 2"] 
  },
  { name: "Doc 1", 
    product: ["product 1", "product 2"],
    type: ["type 1", "type 2"] 
  },
  { name: "Doc 2", 
    product: ["product 1"],
    type: ["type 1"] 
  },
  { name: "Doc 3", 
    product: ["product 2"],
    type: ["type 2"] 
  }
  ...
]

Answer 1

您可以使用Object.assign克隆对象，并使用[].concat(yourArray)元数组。

 var docs = [ { name: "Doc 1", product: ["product 1", "product 2"], type: ["type 1", "type 2"] }, { name: "Doc 2", product: ["product 1"], type: ["type 1"] }, { name: "Doc 3", product: ["product 2"], type: ["type 2"] } ] var cloned = docs.map(function (c) { // This will not clone the product c = Object.assign({}, c); // Clone the product array c.product = [].concat(c.product); return c; }); // Group by products var byProduct = { /* "product 1": [...] */ }; cloned.forEach(function (c) { c.product.forEach(function (prod) { var groupedDocs = byProduct[prod] = byProduct[prod] || []; groupedDocs.push(c); }); }); console.log(byProduct);