Question

我得到一个跟随的物体

{
  IuW1zvaSABwH4q: {
    label: 'Random Image of TypeScript not relavent to coworking',
    thumbId: 'd501-f-b601-c8b1-4bd995e',
    schemaType: 'xman-assets-image-set'
  }
}

现在，我要访问其中的thumbID的值，即 d501-f-b601-c8b1-4bd995e

但是我的根密钥似乎是动态/随机的（IuW1zvaSABwH4q），我该如何访问其中的值？

Answer 1

您可以从对象获取值，然后访问所需的键。

let obj =  {
    IuW1zvaSABwH4q: 
      {
        label: 'Random Image of TypeScript not relavent to coworking', 
        thumbId: 'd501-f-b601-c8b1-4bd995e',
        schemaType: 'xman-assets-image-set' 
      } 
    }
    
let op = Object.values(obj)[0].thumbId

console.log(op)

Answer 2

您可以使用 Array.map 对其进行转换，并使用 Array.forEach 进行获取并将其打印在控制台中。

const obj = {
    IuW1zvaSABwH4q: {
        label: 'Random Image of TypeScript not relavent to coworking',
        thumbId: 'd501-f-b601-c8b1-4bd995e',
        schemaType: 'xman-assets-image-set'
    },
    YuW1zvaSABwH7q: {
        label: 'Random Image of TypeScript not relavent to coworking',
        thumbId: 'as90-f-b601-c8b1-4bd9958', 
        schemaType: 'xman-assets-image-set'
    }
};
//for one object
console.log(Object.values(obj)[0].thumbId);
//multiple unknown keys
Object.values(obj).map(ele => ele.thumbId).forEach(th=> console.log(th));

Answer 3

假设只有一个属性，则可以通过第一个属性访问它。

const obj = { IuW1zvaSABwH4q: 
      { label: 'Random Image of TypeScript not relavent to coworking', thumbId: 'd501-f-b601-c8b1-4bd995e', schemaType: 'xman-assets-image-set' 
       } 
    };
    
console.log(obj[Object.getOwnPropertyNames(obj)[0]].thumbId);

Answer 4

您可以使用false来迭代对象，然后检查该对象是否具有名称为null的密钥。如果对象没有for..in键

，此检查将确保代码不会引发错误。

thumbId

Answer 5

尝试

thumbId

let obj = {
  IuW1zvaSABwH4q: {
    label: 'Random Image of TypeScript not relavent to coworking',
    thumbId: 'd501-f-b601-c8b1-4bd995e',
    schemaType: 'xman-assets-image-set'
  }
}


for (let keys in obj) {
  if (obj[keys].hasOwnProperty('thumbId')) {
    console.log(obj[keys].thumbId);
  }
}

Answer 6

使用underscore

let yourObject = {
  IuW1zvaSABwH4q: {
    label: 'Random Image of TypeScript not relavent to coworking',
    thumbId: 'd501-f-b601-c8b1-4bd995e',
    schemaType: 'xman-assets-image-set'
  }
}

_.pluck(_.values(yourObject),'thumbId');
// ["d501-f-b601-c8b1-4bd995e"]

您还可以使用_.first安全地访问第一个数组元素

Answer 7

结合使用另一种方法

dataProvider(GET_LIST, 'clicks', { // }) .then(response => this.setState({ [myWeekly]: response.data.count })) /* ^^ This callback runs after the while block By this time, myDaily === "AKdaily" */和JSON.stringify()

split()

Answer 8

var json = {
  IuW1zvaSABwH4q: {
    label: 'Random Image of TypeScript not relavent to coworking',
    thumbId: 'd501-f-b601-c8b1-4bd995e',
    schemaType: 'xman-assets-image-set'
  },
    IuW2zvaSABwH4q: {
    label: 'Random Image of TypeScript not relavent to coworking',
    thumbId: 'd501-f-b601-c8b1-4bd995e',
    schemaType: 'xman-assets-image-set'
  },
    IuW3zvaSABwH4q: {
    label: 'Random Image of TypeScript not relavent to coworking',
    thumbId: 'd501-f-b601-c8b1-4bd995e',
    schemaType: 'xman-assets-image-set'
  }
}

for (var key in json) {
  if (json[key]) {
    for (var x in json[key]) {
      if (x === 'thumbId') console.log(json[key][x]);
    }
  }
}

我使用两个嵌套的来提取thumbId。

当您不知道键时访问对象内部的某些内容

8 个答案: