Js在数组中添加元素

Question

如何提取数组中的字段，然后添加新的字段，获取数据如下：var data = [{"id":"1","name":"华为","data":"25u6s8f545d3"},{"id":"2","name":"小米","data":"cd58de9d3c5d"},];我想获得的数据格式如下：var data = [{"id":"1","name":"华为","data":"25u6s8f545d3","mac":"25:u6:s8:f5:45:d3"},{"id":"2","name":"小米","data":"cd58de9d3c5d","mac":"cd:58:de:9d:3c:5d"},];我现在方法如下：for (var i = 0; i < data.length; i++) {    var mac = data[i].data.toUpperCase();        mac1 = mac.substring(0, 2);        mac2 = mac.substring(2, 4);        mac3 = mac.substring(4, 6);        mac4 = mac.substring(6, 8);        mac5 = mac.substring(8, 10);        mac6 = mac.substring(10, 12);        var mac = mac1 + ':' + mac2 + ':' + mac3 + ':' + mac4 + ':' + mac5 + ':' + mac6;        data[i].mac = mac; };请教下有没有更好的方法？我觉得自己方法有点烂。

Answer 1

var data = [

  { "id": "1", "name": "华为", "data": "25u6s8f545d3" },

  { "id": "2", "name": "小米", "data": "cd58de9d3c5d" },

];

data.forEach(item => {

  item.mac = item.data.replace(/\w{2}\B/g, '$&:')

})

console.log(data)

Answer 2

var data = [

  { "id": "1", "name": "华为", "data": "25u6s8f545d3" },

  { "id": "2", "name": "小米", "data": "cd58de9d3c5d" },

];

var newData= data.map(item =>Object.assign({},item,{mac:item.data.match(/\w{1,2}/gi).join(":")})

);