Question

[
    {
        name:"Technology",
        logoImage:require("../../assets/g837.png"),
        subCategory:[
            "IT",
            "Networks",
            "Appliances",
            "Industrial Machines",
            "Medical technology",
            "robotics",
            "AI",
            "Electronics",
            "Explosives",
            "Machinery", 
            "Cryptocurrency",
            "Electric Vehicles",
            "Biotechnology"

        ]
    },
    {
        name:"Business",
        logoImage:require("../../assets/business.png"),
        subCategory:[
            "Industries",
            "Economics",
            "Journalism",
            "Labor",
            "Law",
            "Real estate",
            "Entrepreneurship",
            "Investment",
            "Banking",
            "Leadership",
            "Advertising",
            "Business Strategy", 
            "Marketing",
            "E-commerce"
        ]
    },
    {
        name:"Entertainment",
        logoImage:require("../../assets/entertainment.png"),
        subCategory:[
            "Comedy",
            "Dance",
            "Dramas",
            "Films",
            "Gaming",
            "Toys",
            "Gambling",
            "Comics",
            "Social sites"

        ]
    }
]

Answer 1

假设您用于存储JSON的变量称为{ "MOCType":"Temporary Repair","MOCStatusUpdatedDateTime":"2018-10-31T10:00:00Z","TagNumber":"4850-A-101-A01A,4850-A-101-A03C,4850-A-101-A08,4850-A-101-A10A,4850-A-101-A10B,4850-A-101-A10C,4850-A-101-A11,4850-A-101-A12,6320-T-003C","Id":"CLX000A" }，您会做的

{
"4850-A-101-A01A" :{
"Temporary Repair (eMOC)": "OK"
},

"4850-A-101-A03C" :{
"Temporary Repair (eMOC)": "OK"
},

"4850-A-101-A08" :{
"Temporary Repair (eMOC)": "OK"
},

"4850-A-101-A10B" :{
"Temporary Repair (eMOC)": "OK"
}
}

在for循环中，您还可以循环访问数组的所有子类别。

Answer 2

const myArray = [
    {
        "subCategory":[
            "IT",
            "Networks"
        ]
    },
    {
        "subCategory":[
            "IT",
            "Networks"
        ]
    }
]

myArray.forEach((eachObject) => {
  console.log(eachObject.subCategory)
})

假设您已将该数组存储在变量 myArray

中

然后，您可以在forLoop的帮助下轻松地迭代subCategory的值。

myArray.forEach((eachObject) => {
    console.log(eachObject.subCategory)
})

Answer 3

如果这只是一个简单的JS问题，请访问数组/对象中的某些数据。...

要访问数组中的元素：

array[index] // first element start from 0.

上面的“元素”可以视为字符串，数字，对象甚至是数组内部的数组。

要访问对象内部的元素，请执行以下操作：

let obj = {a:100,b:200,c:300}

object.key //obj.a means will get the value of 100

或

object["key"] //obj["b"] means will get the value of 200

或

let x = "c"

object[variable] // obj[x] is equal to obj["c"] means will get the value of 300.

因此，要从对象数组中的数组访问“ subCategory”，只需组合以上策略即可：

var nestedArray = [
    {
        name:"Technology",
        logoImage:require("../../assets/g837.png"),
        subCategory:[
            "IT",
            "Networks",
            "Appliances",
            "Industrial Machines",
            "Medical technology",
            "robotics",
            "AI",
            "Electronics",
            "Explosives",
            "Machinery", 
            "Cryptocurrency",
            "Electric Vehicles",
            "Biotechnology"

        ]
    },
    {
        name:"Business",
        logoImage:require("../../assets/business.png"),
        subCategory:[
            "Industries",
            "Economics",
            "Journalism",
            "Labor",
            "Law",
            "Real estate",
            "Entrepreneurship",
            "Investment",
            "Banking",
            "Leadership",
            "Advertising",
            "Business Strategy", 
            "Marketing",
            "E-commerce"
        ]
    },
    {
        name:"Entertainment",
        logoImage:require("../../assets/entertainment.png"),
        subCategory:[
            "Comedy",
            "Dance",
            "Dramas",
            "Films",
            "Gaming",
            "Toys",
            "Gambling",
            "Comics",
            "Social sites"
        ]
    }
]


var subCategoryArray = nestedArray[0]["subCategory"] // return  ["IT", "Networks",...]

如果阵列中有多个对象，则需要使用for循环：

var subCategoryArray = []
for(var i = 0; i < nestedArray.length; i++){
   subCategoryArray= subCategoryArray.concat(nestedArray[i]["subCategory"])
}

console.log(subCategoryArray) //return ["IT", "Networks",...,"Comics","Social sites"]

如何访问数组内部的对象数组？

3 个答案: