如何使用節點js遍歷不規則的嵌套json

Question

我在Nodejs上制作了一個小應用程序，但我正努力嘗試循環一個不規則的JSON以打印其數據。

我的JSON具有以下結構：

{
"courses": [
    {
        "java": [
            { "attendees": 43 },
            { "subject": "Crash course" }
        ]
    },
    {
        "python":
        {
            "occurrences": [
                { "attendees": 24 },
                { "subject": "another crash course" },
                { "notes": "completed with issues" }
            ,
                { "attendees": 30 },
                { "subject": "another crash course" },
                { "notes": "completed with issues" }
            ]
        }
    }
],
"instructors":[
    {
        "John Doe":[
            { "hours": 20 },
            { "experience": 50 },
            { "completed": true }
        ]
    },
    {
        "Anne Baes": [
            { "hours": 45 },
            { "experience": 40 },
            { "completed": false},
            { "prevExperience": true}
        ]
    }
]
}

我想要做的是打印JSON中包含的所有數據（我想要類似的東西）：

courses
Java
attendees = 43
...
Anne Baes
hours = 45
experience = 40
completed = false
prevExperience = true

我嘗試過：

for(element in data){
    console.log(`element = ${{element}}`);
}

它只打印：

element = [object Object]
element = [object Object]

（這很有意義，因為json由兩個元素組成）

我試過嵌套行：

for(element in data){

這里的問題是有一個不規則的結構，我的意思是，“ java”和“ python”是同一級別的數據，但同時它們具有不同的（數組和對象）值類型，在“講師”的情況下它們具有相同的值類型，但它們的值數量不同。

有人可以幫我嗎？

Answer 1

您可以使用遞歸和for..in循環來實現

 const obj = { "courses": [ { "java": [ { "attendees": 43 }, { "subject": "Crash course" } ] }, { "python": { "occurrences": [ { "attendees": 24 }, { "subject": "another crash course" }, { "notes": "completed with issues" } , { "attendees": 30 }, { "subject": "another crash course" }, { "notes": "completed with issues" } ] } } ], "instructors":[ { "John Doe":[ { "hours": 20 }, { "experience": 50 }, { "completed": true } ] }, { "Anne Baes": [ { "hours": 45 }, { "experience": 40 }, { "completed": false}, { "prevExperience": true} ] } ] }; function print(obj,isArr = false){ for(let key in obj){ if(typeof obj[key] === 'object'){ if(isArr === false) console.log(key) print(obj[key],Array.isArray(obj[key])); } else console.log(`${key} = ${obj[key]}`) } } print(obj) 

Answer 2

您可以嘗試使用遞歸函數迭代這些值

var Obj {

//Contents

}

function printRec(obj){
if(Object.keys(obj).length>0||Array.isArray(obj)){
  for(elem in obj){
  printRec(obj);
  }
}else{
  //Process Value
  console.log(obj)
}
}