Question

我找不到我的问题的解决方案。我可能会让事情变得更复杂。

这是数组：

var Statistics = {
"STAT 1 COLUMNS" : ["Date","Group Name","Product Name","Version","Version Date","Status","Total","Total L0","Total L1","Total L2","To be validated","Created","Updated"],
"STAT 2 TITLE" : ["12/12/2013","Led Zeppelin","roofies","V5.3","2013-08-13 ","ACCEPTED <br/>(2013-9-10)","774","334","3","437","20","57","102"],
"STAT 3 TITLE" : ["22/11/2014","Deep Purple","upper","V1","2006-01-01 "," ","3","1","0","2","1"," "," "],
...
}

我想通过指定索引来获取特定对象的对象名称（例如'STAT 1 COLUMNS'，'STAT 2 TITLE'，'STAT 3 TITLE'..）。

例如， givemepleasethenameoftheobject（'2'） - ＆gt; “STAT 3 TITLE”

你可以帮我一把吗？

Answer 1

尝试：

function givemepleasethenameoftheobject(index, data) {
  var i = 0;
  for ( var k in data ) {
    if ( index == i++ ) {
      return k;
    }
  }
}

var result = givemepleasethenameoftheobject(2, Statistics);

Answer 2

这应该达到你的需要：

function getStatisticName(index)
{
    var count = 0;
    for(var i in Statistics)
    {
        if(count == index)
            return i;

        count++;
    }
}

请参阅此jsFiddle

Answer 3

尝试'Object.keys（）;'功能

Object.keys(Statistics); // ['STAT 1 COLUMNS', 'STAT 2 TITLE', 'STAT 3 TITLE'];

Answer 4

JavaScript无法保证对象键顺序，因此gimmeTheKey(Statistics, 2) 无法保证返回"STAT 3 TITLE"。

然而：

function gimmeTheKey( obj, idx ){
    return Object.keys( obj )[idx];
}

Answer 5

您可以像这样遍历对象的成员：

for (var key in Statistics) {
  console.log(key);
}

但是，无法通过索引可靠地访问它们。不保证对象中的成员保持与您创建它们的顺序相同，并且不同的浏览器实际上对成员的顺序不同。

如果要以可预测的方式按索引访问成员名称，则需要获取所有名称，然后对其进行排序：

function givemepleasethenameoftheobject(index) {
  var keys = [];
  for (var key in Statistics) {
    keys.push(key);
  }
  keys.sort();
  return keys[index];
}

如果您不需要与旧版浏览器（例如Internet Explorer 8）兼容，则可以使用Object.Keys method：

function givemepleasethenameoftheobject(index) {
  var keys = Object.keys(Statistics);
  keys.sort();
  return keys[index];
}

从javascript中的对象数组中获取对象名称

5 个答案: