Question

我有这个数组obejcts

  var customers =
[{"id":"1", "name":"John","position":"CEO","office":"NY", "active": "1"},
{"id":"2", "name":"Michael","position":"CEO","office":"NY", "active": "1"},
{"id":"3", "name":"Wanda","position":"CEO","office":"NY", "active": "0"},
{"id":"3", "name":"Novak","position":"CEO","office":"NY", "active": "0"}];

我需要的是获得该阵列中的客户数量，

 var indexID = 4;

还有一个看起来像这样的新数组

var newArray =
    [{"id", "name","position","office"}];

这个新数组只收集一次标题而没有活动

Answer 1

首先，json无效。它应该是：

var customers =
[{"id":"1", "name":"John","position":"CEO","office":"NY", "active": "1"},
{"id":"2", "name":"Michael","position":"CEO","office":"NY", "active": "1"},
{"id":"3", "name":"Wanda","position":"CEO","office":"NY", "active": "0"},
{"id":"3", "name":"Novak","position":"CEO","office":"NY", "active": "0"}];

您可以使用length这样计算：

var count = customers.length;

并且您只能使用map()创建具有所需属性的新数组：

var newArray = customers.map(function(item,index){

    return { "id": item.id, "name": item.name,"position": item.position }

});

工作示例：

http://jsfiddle.net/abu209tb/

Answer 2

我很确定。长度就是你要找的......

var indexID = customers.length;
var newArray = Object.keys(customers[0]);

感谢此链接提供参考资料： How do I enumerate the properties of a JavaScript object?

数组Jquery中的对象计数？

2 个答案:

工作示例：