JavaScript在多维JSON数组中循环

我在这里找不到解决问题的正确方法。我想循环使用嵌套的Products数组来显示每个产品名称。我写的东西是否可能，或者我是否需要以一种更容易查询我需要什么的方式重新编写它

            [
               {
                  "category":"A",
                  "products":[
                   {
                     "id":1,
                     "name":"Product 1",
                     "description":"Description of my product 1."
                   },
                   {
                     "id":2,
                     "name":"Product 2",
                     "description":"Description of my product 2."
                   },
                   {
                     "id":3,
                     "name":"Product 3",
                     "description":"Description of my product 3."
                   }
                  ]
               },
               {
                  "category":"B",
                  "products":[
                   {
                     "id":4,
                     "name":"Product 4",
                     "description":"Description of my product 4 in cat B."
                   },
                   {
                     "id":5,
                     "name":"Product 5",
                     "description":"Description of my product 5 in cat B."
                   },
                   {
                     "id":6,
                     "name":"Product 6",
                     "description":"Description of my product 6 in cat B."
                   }
                  ]
               }
            ]

---

当然有可能

• 要在数组[]上循环，请执行以下操作：

  for (initialization; condition; update) {
      ...
  }
  

• 要在对象{}上循环，请执行以下操作：

  for (variable in object) {
      if (object.hasOwnProperty(variable)) {
          ...
      }
  }
  

---

假设整个结构位于一个名为

data

的变量中：

data.forEach(function(category) {
    if (category.hasOwnProperty('product')) {
        category.products.forEach(function(product) {
            console.log(product.name);
        });
    }
});

---

外部

forEach

循环遍历所有类别对象。内部forEach循环遍历每个类别中的所有products对象。

通常，通过数组

things=[…]

的循环如下：

for( var i=0; i<thing.length; i++ ) {
    // do stuff with thing[i]
}

for( key in things ) {
    if( things.hasOwnProperty(key) ) {
        // do stuff with things[key] or key.
    }
}

你可以随心所欲地把它们安顿好

在您的情况下，如果我们将原始数据结构命名为

项

，则 （见）：

---

我想你要找的已经在这里得到了回答：

for( item=0; item<items.length; item++ ) {
    console.log('category is '+items[item].category);
    for( product=0; product<items[item].products.length; product++ ) {
        p = items[item].products[product];
        for( key in p ) {
            console.log('  product '+key+' is '+items[item].products[product][key]);
        }
    }
}

category is A
  product id is 1
  product name is Product 1
  product description is Description of my product 1.
  product id is 2
  product name is Product 2
  product description is Description of my product 2.
  product id is 3
  product name is Product 3
  product description is Description of my product 3.
category is B
  product id is 4
  product name is Product 4
  product description is Description of my product 4 in cat B.
  product id is 5
  product name is Product 5
  product description is Description of my product 5 in cat B.
  product id is 6
  product name is Product 6
  product description is Description of my product 6 in cat B.