Question

我是JavaScript的新手，所以我的数组映射技巧不好，我怎么能在这个数组中找到47243781293的assetid？谢谢。

    EconItem {
  appid: 440,
  contextid: '2',
  assetid: '4723781293',
  classid: '2674',
  instanceid: '11040547',
  amount: 1,
  missing: false,
  currency: false,
  background_color: '3C352E',
  icon_url: '...',
  icon_url_large: '...',
  tradable: false,
  actions: 
   [ { link: 'http://wiki.teamfortress.com/scripts/itemredirect.php?id=5002&lang=en_US',
       name: 'Item Wiki Page...' } ],
  name: 'Refined Metal',
  name_color: '7D6D00',
  type: 'Level 3 Craft Item',
  market_name: 'Refined Metal',
  market_hash_name: 'Refined Metal',
  commodity: false,
  market_tradable_restriction: 7,
  market_marketable_restriction: 0,
  id: '4723781293',
  fraudwarnings: [],
  descriptions: [],
  owner_descriptions: [],
  owner_actions: [],
  tags: [],
  marketable: false 
}

Answer 1

我认为你的意思是在这个JSON＆＃34;中询问＆＃34; ..这是47243781293。而不是＆＃34; ...这个阵列中的47243781293＆＃34;。您粘贴的对象是JSON表示。如果这就是您的意思，请阅读以下内容 -

鉴于密钥id将始终存在并且上面粘贴的对象值被分配给变量EconItem，我会尝试这样的事情

If( EconItem['id'] === '47243781293' )
{
   console.log('Asset id: 47243781293 present in the JSON object');
}

如果您不确定密钥ID将始终存在于对象中，我将首先使用Object.keys（）检查密钥是否存在。详细信息可在此处找到 - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys

希望有所帮助！

Answer 2

要从对象获取值，请参阅它的关键字：EconItem.assetid

对于具有多个结果的对象，您可以对其进行迭代，并从对象输出特定值，如下所示：

for (var i in EconItem)
{
    console.log(EconItem[i].assetid);
    //do more here
}

Answer 3

要在数组中找到它，您可以使用filter这是每个javascript数组附带的函数，使用上面的对象为每个EconItem

  let array = [EconItem, EconItem]

   search = array.filter(eachItem=>eachItem.assetId==='47243781293');
--> returns an array of items with assetId as 47243781293, now the first item should be your EconItem, i.e search[0];

检查示例代码段

＆＃13;

var items = [{
  appid: 440,
  contextid: '2',
  assetid: '4723781293'
}, {
  appid: 441,
  contextid: '2',
  assetid: '4723781292'
}];


// now we search with this 4723781293 
var search = items.filter(function(item){
return item.assetid === '4723781293';
});

//show our search result
alert ("item appid is:"+search[0].appid+", context:"+search[0].contextid+", assetid:"+search[0].assetid);

＆＃13;

如何在这个JavaScript数组中获得一定的数字？

3 个答案: