Javascript为每个对象对象json添加一个ID

Question

我有一个问题.Json文件中有很多对象，如下所示。我想为每个对象给出一个从0开始的索引号，我该怎么做？

    {
        "language": "Python",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    }
]

Answer 1

您可以在对象上循环并添加新属性，

var array =[   {
        "language": "Python1",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    },  {
        "language": "Python2",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    }
];
for (i = 0; i < array.length; i++) { 
 array[i]["index "] =i;
}
console.log(array);

Answer 2

如果使用ES，可能是这样的

您应该使用map迭代对象并在其中添加属性

var yourObjects =[   {
        "language": "Python1",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    },  {
        "language": "Python2",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    }
];

var i = 0;    
 yourObjects.map(
     (obj) => {
          obj['index'] = i;
          i++
          return obj;
     });
console.log(yourObjects);

Answer 3

您可以使用Array.prototype.map()（MDN）来获取新的索引数组。

var array = [{
  "language": "Python1",
  "created": "2018-8-27 14:50:31",
  "evaluated": true,
  "hiddenCode": false
}, {
  "language": "Python2",
  "created": "2018-8-27 14:50:31",
  "evaluated": true,
  "hiddenCode": false
}]

const indexed = array.map((item, index) => Object.assign(item, { index }))

console.log(indexed)