javascript - 迭代 json 对象

Question

我在用纯 JavaScript 代码迭代 json 对象时遇到问题。 for 循环或 for each 循环会很棒，但我无法循环它。

//I want output in format like 
{
 applicationGroupId:
 [
  treatmentIds
 ]
}

喜欢；

{
    "879545457291368": [
        879545457291370
    ],
    "879545447124032": [
        879545447124036,
        879545447124034
    ]
}


<script>

var text = '{"treatmentApplicationGroupDataList": [{"applicationGroupId": 879545457291368,"treatments":[{"treatmentId": 879545457291370}]},{"applicationGroupId": 879545447124032,'+
           '"treatments": [{"treatmentId": 879545447124036 },{"treatmentId": 879545447124034}]}]}';

     var myObject = JSON.parse(text);

     for(var i in myObject){

   document.write(myObject.treatmentApplicationGroupDataList[0].applicationGroupId);
   document.write(myObject.treatmentApplicationGroupDataList[0].treatments[0].treatmentId);

   document.write(myObject.treatmentApplicationGroupDataList[1].applicationGroupId);
   document.write(myObject.treatmentApplicationGroupDataList[1].treatments[0].treatmentId);
   ocument.write(myObject.treatmentApplicationGroupDataList[1].treatments[1].treatmentId);

     }

</script>

如您所见，我正在手动打印结果，但不是在 for 循环中。

Answer 1

正如您在示例中尝试做的那样，您可以使用 for-in 方法:

var text = '{"treatmentApplicationGroupDataList": [{"applicationGroupId": 879545457291368,"treatments":[{"treatmentId": 879545457291370}]},{"applicationGroupId": 879545447124032,"treatments": [{"treatmentId": 879545447124036 },{"treatmentId": 879545447124034}]}]}';

var myObject = JSON.parse(text);

// Using the for-in method
for (treatmentListId in myObject.treatmentApplicationGroupDataList) {
    var curTreatmentList = myObject.treatmentApplicationGroupDataList[treatmentListId];

    console.log(curTreatmentList.applicationGroupId+": ");

    for (treatmentId in curTreatmentList.treatments) {
        console.log("=>"+curTreatmentList.treatments[treatmentId].treatmentId);
    }
}    

或者您可以使用 .forEach method :

myObject.treatmentApplicationGroupDataList.forEach(function(treatmentList){
    console.log(treatmentList.applicationGroupId+": ");
    treatmentList.treatments.forEach(function(treatment){
        console.log("=> "+treatment.treatmentId);
    });
});

此处提供更多信息:For-each over an array in JavaScript?