javascript - 检查子对象是否存在，如果存在，则添加到对象

Question

这个问题已经有答案了:

How to determine equality for two JavaScript objects? (82 个回答)

已关闭 7 年前。

我正在尝试将一个对象添加到另一个对象。

假设我有两个对象。 selectedItemObj和selectedItemQueue 。我想添加selectedItemObj至selecteditemQueue但前提是 selectedItemObject与 selectedItemQueue 中的任何对象都不匹配

假设我这里有这个对象:

var selecteditemObj = [
   {
      "market_hash_name":"Chroma 2 Case Key 1",
      "assetid":"92700754417_143965972",
      "amount":1,
      "image":"https://steamcommunity-a.akamaihd.net/economy/image/-9a81dlWLwJ2UUGcVs_nsVtzdOEdtWwKGZZLQHTxDZ7I56KU0Zwwo4NUX4oFJZEHLbXX7gNTPcUxuxpJSXPbQv2S1MDeXkh6LBBOie3rKFRh16PKd2pDvozixtSOwaP2ar7SlzIA6sEo2rHCpdyhjAGxr0A6MHezetG0RZXdTA/"
   }];



var selectedItemQueue = [
   {
      "market_hash_name":"Chroma 2 Case Key 2",
      "assetid":"92700754667_143865972",
      "amount":1,
      "image":"https://steamcommunity-a.akamaihd.net/economy/image/-9a81dlWLwJ2UUGcVs_nsVtzdOEdtWwKGZZLQHTxDZ7I56KU0Zwwo4NUX4oFJZEHLbXX7gNTPcUxuxpJSXPbQv2S1MDeXkh6LBBOie3rKFRh16PKd2pDvozixtSOwaP2ar7SlzIA6sEo2rHCpdyhjAGxr0A6MHezetG0RZXdTA/"
   },
   {
      "market_hash_name":"Shadow Case Key 3",
      "assetid":"1293611210722_143865972",
      "amount":1,
      "image":"https://steamcommunity-a.akamaihd.net/economy/image/-9a81dlWLwJ2UUGcVs_nsVtzdOEdtWwKGZZLQHTxDZ7I56KU0Zwwo4NUX4oFJZEHLbXX7gNTPcUxuxpJSXPbQv2S1MDeXkh6LBBOiePrKF4wi6aaIGwStN_jl4bSzvXwMO6AwDlSvsYoiOiZ8dij3QbtqkU9ZnezetFWWxusZg/"
   },
   {
      "market_hash_name":"Shadow Case Key 4",
      "assetid":"123393510722_143861972",
      "amount":1,
      "image":"https://steamcommunity-a.akamaihd.net/economy/image/-9a81dlWLwJ2UUGcVs_nsVtzdOEdtWwKGZZLQHTxDZ7I56KU0Zwwo4NUX4oFJZEHLbXX7gNTPcUxuxpJSXPbQv2S1MDeXkh6LBBOiePrKF4wi6aaIGwStN_jl4bSzvXwMO6AwDlSvsYoiOiZ8dij3QbtqkU9ZnezetFWWxusZg/"
   }
];

这是我的尝试，它添加到队列中，但不检查子对象是否存在。我怎样才能添加它？

function addItemToSelectedQueue(assetId){
    var itemObj = findItemById(assetId);
    var queueHasItem = false;
    for (var i = selectedItemQueue.length - 1; i >= 0; i--) {
        if (selectedItemQueue[i] === itemObj) {
            queueHasItem == true;
        };
    };
    if (queueHasItem == false) {
        selectedItemQueue.push(itemObj);
        updateSelecteditems();
    };
}

Answer 1

我会这样做:

function addItemToSelectedQueue(fromobj, toobj){
    var found = false;
    for(var x=0; x<toobj.length; x++){
      if(toobj[x].market_hash_name == fromobj[0].market_hash_name){
        found = true;
      }
    }

    if(found == false){
      toobj.push(fromobj[0]);
    }
}

用法:

addItemToSelectedQueue(selecteditemObj, selectedItemQueue);

对我来说工作得很好!