node.js 从 NodeJS 中的 JSON 列表中获取键值
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Get key value from the list of JSON in NodeJS
提问by user1662039
I am receiving the JSON object as a list of objects:
我正在接收 JSON 对象作为对象列表：
result=[{"key1":"value1","key2":"value2"}]
I am trying to retrieve the values from this list in Node.js. I used JSON.stringify(result)but failed. I have been trying to iterate the list using for(var key in result)with no luck, as it prints each item as a key.
我正在尝试从 Node.js 中的此列表中检索值。我用过JSON.stringify(result)但是失败了。我一直在尝试使用for(var key in result)没有运气的迭代列表，因为它将每个项目打印为一个键。
Is anyone facing a similar issue or has been through this? Please point me in the right direction.
有没有人遇到过类似的问题或经历过这个问题？请指出我正确的方向。
回答by Florent B.
If your result is a string then:
如果您的结果是字符串，则：
var obj = JSON.parse(result);
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++) {
console.log(obj[keys[i]]);
}
回答by Chitharanjan Das
Okay, assuming that resulthere is a string, the first thing you need to do is to convert (deserialize) it to a JavaScript object. A great way of doing this would be:
好的，假设result这里是一个字符串，您需要做的第一件事就是将它转换（反序列化）为一个 JavaScript 对象。这样做的一个好方法是：
array = JSON.parse(result)
Next you loop through each item in the array, and for each item, you can loop through the keys like so:
接下来循环遍历数组中的每一项，对于每一项，你可以循环遍历键，如下所示：
for(var idx in array) {
var item = array[idx];
for(var key in item) {
var value = item[key];
}
}
回答by vinayakj
Lookslike you are pointing to wrong object. Either do like
看起来您指向了错误的对象。要么喜欢
var result = [{"key1":"value1","key2":"value2"}];
for(var key in result[0]){ alert(key);}or
或者
var keys = Object.keys([{"key1":"value1","key2":"value2"}][0]);
alert(keys);回答by Shiva
try this code:
试试这个代码：
For result=[{"key1":"value1","key2":"value2"}]
Below will print the values for Individual Keys:
下面将打印单个键的值：
console.log(result[0].key1)
console.log(result[0].key2)
回答by Avalanchd
Wouldn't this just be:
这不就是：
let obj = JSON.parse(result);
let arrValues = Object.values(obj);
which would give you an array of just the values to iterate over.
这将为您提供一个仅包含要迭代的值的数组。
回答by pride
A little different approach:
有点不同的方法：
let result=[{"key1":"value1","key2":"value2"}]
for(let i of result){
console.log("i is: ",i)
console.log("key is: ",Object.keys(i));
console.log("value is: ",Object.keys(i).map(key => i[key])) // Object.values can be used as well in newer versions.
}
