javascript 如何在具有动态键值对的javascript中解析json？
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How to parse json in javascript having dynamic key value pair?
提问by Amit Das
I want to parse a JSON string in JavaScript. The response is something like
我想用 JavaScript 解析一个 JSON 字符串。响应类似于
var response = '{"1":10,"2":10}';
How can I get the each key and value from this json ?
我怎样才能从这个 json 中获取每个键和值？
I am doing this -
我在做这个——
var obj = $.parseJSON(responseData);
console.log(obj.count);
But i am getting undefinedfor obj.count.
但我得到undefined了obj.count。
回答by TaoPR
To access each key-value pair of your object, you can use Object.keysto obtain the array of the keys which you can use them to access the value by [ ] operator. Please see the sample code below:
要访问对象的每个键值对，您可以使用Object.keys获取键的数组，您可以使用它们通过 [ ] 运算符访问值。请参阅下面的示例代码：
Object.keys(obj).forEach(function(key){
var value = obj[key];
console.log(key + ':' + value);
});
Output:
输出：
1 : 10
2 : 20
1 : 10
2 : 20
Objects.keysreturns you the array of the keys in your object. In your case, it is ['1','2']. You can therefore use .lengthto obtain the number of keys.
Objects.keys返回对象中的键数组。在你的情况下，它是['1','2']。因此，您可以使用.length来获取密钥的数量。
Object.keys(obj).length;
回答by Marcos Pérez Gude
So you need to access it like an array, because your keys are numbers. See this fiddle:
所以你需要像数组一样访问它，因为你的键是数字。看到这个小提琴：
You can access like this:
您可以这样访问：
result[1] // this returns 10
result.1 // this returns an error
Good luck
祝你好运
