从json获取特定值[重复]

This question already has an answer here:

这个问题在这里已有答案:

• From an array of objects, extract value of a property as array 12 answers

从一组对象中,提取属性的值作为数组12的答案

I have this json. I only care about the uniqueIDs.

我有这个json。我只关心uniqueIDs。

How can I get ONLY the uniqueID values delivered back to me as a comma separated list, ie, 11111, 22222? (I need to create my own array.) I can't edit the json below - I am just trying to parse the value I care about out of it....

我怎样才能将唯一ID值作为逗号分隔列表传递给我,即11111,22222? (我需要创建自己的数组。)我无法编辑下面的json - 我只是想解析我关心的值....

{
        products: [{
            type: "Unique",
            name: "Joe",
            description: "Joes Description",
            uniqueID: "11111"
        }, {
            type: "Unique",
            name: "Jane",
            description: "Janes Description",
            uniqueID: "22222"
        }]
}

Thought it would be this easy but its not...

以为这会很容易,但不是......

$data['uniqueID'][0]

3 个解决方案

#1

Use map function:

使用地图功能:

var foo = {
  metadata: {
    products: [{
      type: "Unique",
      name: "Joe",
      description: "Joes Description",
      uniqueID: "11111"
    } {
      type: "Unique",
      name: "Jane",
      description: "Janes Description",
      uniqueID: "22222"
    }]
  }
}
var ids = foo.metadata.products.map(x => x.uniqueID);

And if you are not familiar with arrow function:

如果你不熟悉箭头功能:

var ids = foo.metadata.products.map(function(x){
    return x.uniqueID;
});

#2

The Underscore Way

You can use underscore js _.pluck() or _.map() function.

您可以使用下划线js _.pluck()或_.map()函数。

var data = {
  metadata: {
    products: [{
      type: "Unique",
      name: "Joe",
      description: "Joes Description",
      uniqueID: "11111"
    },
    {
      type: "Unique",
      name: "Jane",
      description: "Janes Description",
      uniqueID: "22222"
    }]
  }
};


//Use plunk method
var uniqueIDArr = _.pluck(data.metadata.products, 'uniqueID'); 

console.log(uniqueIDArr);
//=> ["11111", "22222"]

//Use map function
var uniqueIDArr = _.map(data.metadata.products, function(obj) {
  return obj.uniqueID;
}); 
console.log(uniqueIDArr);
//=> ["11111", "22222"]

<script src="https://cdn.jsdelivr.net/underscorejs/1.8.3/underscore-min.js"></script>

#3

You can use Array.prototype.map() to create a new array and chain a Array.prototype.join() to get the uniqueIDsString in a single line:

您可以使用Array.prototype.map()创建一个新数组并链接一个Array.prototype.join()以在一行中获取uniqueIDsString:

var obj = {metadata: {products: [{type: "Unique",name: "Joe",description: "Joes Description",uniqueID: "11111"}, {type: "Unique",name: "Jane",description: "Janes Description",uniqueID: "22222"}]}},
    uniqueIDsString = obj
        .metadata
        .products
        .map(function(product) {
            return product.uniqueID;
        })
        .join(', ');

console.log(uniqueIDsString);