从javascript中的对象数组中获取对象名称

Question

我找不到解决问题的办法。我可能让事情变得更复杂了。

下面是数组：

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"," "," "],
...
}

我想要对象名(例如'STAT 1列‘，'STAT 2 TITLE'，'STAT 3 TITLE’.)对于特定对象，通过指定索引。

例如，给予对象(‘2’) -> "STAT 3标题“的名称

你能帮我一把吗？

Answer 1

您可以循环遍历这样的对象的成员：

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

但是，您不能通过这样的索引可靠地访问它们。对象中的成员不能保证保持与创建它们相同的顺序，不同的浏览器实际上对成员进行了不同的排序。

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，然后对它们进行排序：

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

如果不需要与旧浏览器(例如Internet 8)兼容，可以使用 method

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

Answer 2

试着：

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

var result = givemepleasethenameoftheobject(2, Statistics);

Answer 3

尝试'Object.keys();‘函数。

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