[英]Get object names from a array of objects in javascript
我找不到我的問題的解決方案。 我可能會使事情變得更復雜。
這是數組:
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"," "," "],
...
}
我想通過指定索引來獲取特定對象的對象名稱(例如“ STAT 1列”,“ STAT 2標題”,“ STAT 3標題” ..)。
例如,請給我對象的名稱('2')->“ STAT 3 TITLE”
你能幫我一下嗎?
嘗試:
function givemepleasethenameoftheobject(index, data) {
var i = 0;
for ( var k in data ) {
if ( index == i++ ) {
return k;
}
}
}
var result = givemepleasethenameoftheobject(2, Statistics);
這應該可以實現您所需要的:
function getStatisticName(index)
{
var count = 0;
for(var i in Statistics)
{
if(count == index)
return i;
count++;
}
}
看到這個jsFiddle
嘗試使用“ Object.keys();” 功能。
Object.keys(Statistics); // ['STAT 1 COLUMNS', 'STAT 2 TITLE', 'STAT 3 TITLE'];
對象鍵順序沒有JavaScript的保證,所以gimmeTheKey(Statistics, 2)
不能保證返回"STAT 3 TITLE"
。
然而:
function gimmeTheKey( obj, idx ){
return Object.keys( obj )[idx];
}
您可以像這樣遍歷對象的成員:
for (var key in Statistics) {
console.log(key);
}
但是,您不能像這樣通過索引可靠地訪問它們。 不能保證對象中的成員保持與創建它們時相同的順序,並且實際上不同的瀏覽器的成員順序也不同。
如果要以可預測的方式按索引訪問成員名稱,則需要獲取所有名稱,然后對它們進行排序:
function givemepleasethenameoftheobject(index) {
var keys = [];
for (var key in Statistics) {
keys.push(key);
}
keys.sort();
return keys[index];
}
如果不需要與舊版瀏覽器(例如Internet Explorer 8)兼容,則可以使用Object.Keys
方法 :
function givemepleasethenameoftheobject(index) {
var keys = Object.keys(Statistics);
keys.sort();
return keys[index];
}
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