javascript - JS : Convert a specific values from an object into an array?

Question

我有一个对象:

var obj = 
[
 {
   "value": "aep",
   "label": "AEP"
 },
 {
   "value": "cap",
   "label": "CAP"
 },
 {
   "value": "casl",
   "label": "CASL"
 } ] 

我只想将标签的值转换为数组，以便最终结果是:

["AEP", "CAP", "CASL"]

如何仅获取数组中转换的标签值？

Answer 1

首先:obj不是一个对象，它是一个数组，因为父括号是[]而不是{}。不过，我会保持名称不变。这可能会给您带来一些困惑，例如

var object = {};
var array = [];
var arrayOfObjects = [{},{},{}];
var objectOfArrays = {array1: [],array2: [],array3: []};

要循环数组，您可以使用 for 循环:

// new array
var newArray = [];
// iterates over each index in the array
for(var i=0; i<obj.length; i++) {
    // Access the specific index, then access its `label` property
    // Push into `newArray`
    newArray.push(obj[i].label);
}

console.log(newArray);

代码笔:http://codepen.io/theblindprophet/pen/RRxVba