Js将值推送到对象数组

Question

我有以下对象数组

 datasets: [{
    data: [],
    backgroundColor: [
        "#FF6384",
        "#4BC0C0",
        "#FFCE56",
        "#E7E9ED",
        "#36A2EB"
    ],
    label: 'My dataset' // for legend
}],
labels: []
};

我有另一个对象数组如波纹管

[
{
"PORT": "MY",
"Country Name": "AUSTRALIA",
"nocontainers": "1017"
},
{
"PORT": "MY"
"Country Name": "CAMBODIA",
"nocontainers": "1"
},
{
"PORT": "DE"
"Country Name": "CHINA",
"nocontainers": "13846"
},
{
"PORT": "DE"
"Country Name": "HONG KONG",
"nocontainers": "252"
},
{
"PORT": "MY"
"Country Name": "INDONESIA",
"nocontainers": "208"
}

我想要的是将“nocontainers”中的所有值从“数据”键和值从“国家名称”推送到第一个数组中的“标签”键。

我试过array.push但是没有用，我的最后一个数组应该看起来像下面

 datasets: [{
    data: [1017, 1, 13846, 252, 208],
    backgroundColor: [
        "#FF6384",
        "#4BC0C0",
        "#FFCE56",
        "#E7E9ED",
        "#36A2EB"
    ],
    label: 'My dataset' // for legend
}],
labels: ["AUSTRALIA (MY)","CAMBODIA (MY)","CHINA (DE)","HONG KONG (DE)","INDONESIA (MY)"]
};

Answer 1

您可以使用带有.map的destructuring assignment创建对象，以从countries对象中提取所需的属性。

见下面的工作示例：

const countries = [{PORT:"MY","Country Name":"AUSTRALIA",nocontainers:"1017"},{PORT:"MY","Country Name":"CAMBODIA",nocontainers:"1"},{PORT:"DE","Country Name":"CHINA",nocontainers:"13846"},{PORT:"DE","Country Name":"HONG KONG",nocontainers:"252"},{PORT:"MY","Country Name":"INDONESIA",nocontainers:"208"}];

const obj = {
  datasets: {
    data: [],
    backgroundColor: ["#FF6384", "#4BC0C0", "#FFCE56", "#E7E9ED", "#36A2EB"],
    label: 'My dataset'
  },
  labels: []
};

obj.datasets.data = countries.map(({nocontainers: nc}) => +nc);
obj.labels = countries.map(({"Country Name": cn, PORT: p}) => `${cn} (${p})`);

console.log(obj);

Answer 2

let data = {
  datasets: {
    data: [],
    backgroundColor: [
      "#FF6384",
      "#4BC0C0",
      "#FFCE56",
      "#E7E9ED",
      "#36A2EB"
    ],
    label: 'My dataset' // for legend
  },
  labels: []
}
let arr = [{
    "Country Name": "AUSTRALIA",
    "nocontainers": "1017"
  },
  {
    "Country Name": "CAMBODIA",
    "nocontainers": "1"
  },
  {
    "Country Name": "CHINA",
    "nocontainers": "13846"
  },
  {
    "Country Name": "HONG KONG",
    "nocontainers": "252"
  },
  {
    "Country Name": "INDONESIA",
    "nocontainers": "208"
  }
]
arr.forEach(a => {
  data.datasets.data.push(a['nocontainers'])
  data.labels.push(a['Country Name'])
})
console.log(data)