Question

可能重复：
Accessing elements of JSON object without knowing the key names

我在json下面有这个。使用这个我需要迭代这个并推送到数组作为键值，麻烦的是这个json将在运行时出现，我不知道密钥的名称。

MethodParam : [
        {MaxNumberOfDomains : '10'}, 
        {NextToken : '1'}
]

请告知

感谢

Answer 1

这是一种做法。

// First, let's have some variables and your example object/json:
var i, l, key, item = [ {keyOne: 10}, {keyTwo: 'string', keyThree: false} ];
// The example you provided is an array, so we first loop that array of objects/json objects
for (i = 0, l = item.length; i < l; i++) {
    // Now, let's see all the keys in the current object
    console.log('Iterating array ' + (i + 1));
    for (key in item[i]) {
        console.log(key);
    }
}

当我在节点v0.6.11中运行它时，我得到了这个：

node
> // First, let's have some variables and your example object/json:
undefined
> var i, l, key, item = [ {keyOne: 10}, {keyTwo: 'string', keyThree: false} ];
undefined
> // The example you provided is an array, so we first loop that array of objects/json objects
undefined
> for (i = 0, l = item.length; i < l; i++) {
...     // Now, let's see all the keys in the current object
...     console.log('Iterating array ' + (i + 1));
...     for (key in item[i]) {
.....         console.log(key);
.....     }
... }
Iterating array 1
keyOne
Iterating array 2
keyTwo
keyThree
undefined
>

使用javascript读取json密钥而不知道密钥的名称

1 个答案: