blocks|key|2834496|text|您应该编写var+element+=+[];|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2834497|在javascript中，{}是一个空对象，[]是一个空数组。|2834498|entityMap^0|5|H|0|D|2|M|2|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

you should write <code>var element = [];</code> 
in javascript <code>{}</code> is an empty object and <code>[]</code> is an empty array.

blocks|key|202136|text|您的元素不是一个数组，但是您的购物车需要是一个数组才能支持许多元素对象。代码示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|202137|var+element+=+{},+cart+=+[];
element.id+=+id;
element.quantity+=+quantity;
cart.push(element);|code-block|syntax|javascript|202138|如果希望cart是{+element:+{+id:+10,+quantity:+1}+}形式的对象数组，请执行以下操作：|offset|length|style|CODE|202139|var+element+=+{},+cart+=+[];
element.id+=+id;
element.quantity+=+quantity;
cart.push({element:+element});|202140|评论中提到JSON.stringify()是一个令人担忧的问题：|202141|>>+JSON.stringify([{a:+1},+{a:+2}])+
++++++"[{"a":1},{"a":2}]"+|202142|entityMap^0|0|0|9|Z|0|0|5|G|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

Your element is not an array, however your cart needs to be an array in order to support many element objects. Code example:

<pre><code>var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push(element);
</code></pre>

If you want cart to be an array of objects in the form <code>{ element: { id: 10, quantity: 1} }</code> then perform:

<pre><code>var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push({element: element});
</code></pre>

<code>JSON.stringify()</code> was mentioned as a concern in the comment:

<pre><code>&gt;&gt; JSON.stringify([{a: 1}, {a: 2}]) 
 "[{"a":1},{"a":2}]" 
</code></pre>

blocks|key|2834545|text|有了那一行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834546|var+element+=+{};|code-block|syntax|javascript|2834547|您可以将element定义为普通对象。本机JavaScript对象没有push()方法。要向普通对象添加新项，请使用以下语法：|offset|length|style|CODE|2834548|element[+yourKey+]+=+yourValue;|2834549|另一方面，您可以使用以下命令将element定义为数组|2834550|var+element+=+[];|2834551|然后，您可以使用push()添加元素。|2834552|entityMap^0|0|0|4|7|Z|6|0|0|F|7|0|0|8|6|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|14|8|@$I|15|J|16|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|18|8|@$I|19|J|1A|K|L]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|V|$]]

With that row

<pre><code>var element = {};
</code></pre>

you define <code>element</code> to be a plain object. The native JavaScript object has no <code>push()</code> method. To add new items to a plain object use this syntax:

<pre><code>element[ yourKey ] = yourValue;
</code></pre>

On the other hand you could define <code>element</code> as an array using

<pre><code>var element = [];
</code></pre>

Then you can add elements using <code>push()</code>.

blocks|key|2834554|text|cart.push({"element":{+id:+id,+quantity:+quantity+}});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2834555|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>cart.push({"element":{ id: id, quantity: quantity }});
</code></pre>

blocks|key|2834562|text|如果购物车必须存储为对象而不是数组(尽管我建议存储为[])，则可以始终将结构更改为使用ID作为键：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834563|var+element+=+{+quantity:+quantity+};
cart[id]+=+element;|code-block|syntax|javascript|2834564|这允许您将多个项目添加到购物车中，如下所示：|2834565|cart["1"]+=+{+quantity:+5};
cart["2"]+=+{+quantity:+10};

//+Cart+is+now:
//+{+"1":+{+quantity:+5+},+"2":+{+quantity:+10+}+}|2834566|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If the cart has to be stored as an object and not array (Although I would recommend storing as an []) you can always change the structure to use the ID as the key:

<pre><code>var element = { quantity: quantity };
cart[id] = element;
</code></pre>

This allows you to add multiple items to the cart like so:

<pre><code>cart["1"] = { quantity: 5};
cart["2"] = { quantity: 10};

// Cart is now:
// { "1": { quantity: 5 }, "2": { quantity: 10 } }
</code></pre>

blocks|key|199805|text|+function+addValueInObject(value,+object,+key)+{

++++++++var+addMoreOptions+=+eval('{"'++%2B+key+%2B+'":'+%2B++value+%2B+'}');

++++++++if(addMoreOptions+!=+null)+{
++++++++++++var+textObject+=+JSON.stringify(object);
++++++++++++textObject+=+textObject.substring(1,textObject.length-1);
++++++++++++var+AddElement+=+JSON.stringify(addMoreOptions);
++++++++++++object+=+eval('{'+%2B+textObject+%2B','%2B++AddElement.substring(1,AddElement.length-1)+%2B+'}');
++++++++}
++++++++return+object;
++++}

addValueInObject('sdfasfas',+yourObject,+'keyname');|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|199806|或者：|unstyled|199807|var+obj+=+{'key':'value'};

obj.key2+=+'value2';|199808|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code> function addValueInObject(value, object, key) {

 var addMoreOptions = eval('{"' + key + '":' + value + '}');

 if(addMoreOptions != null) {
 var textObject = JSON.stringify(object);
 textObject = textObject.substring(1,textObject.length-1);
 var AddElement = JSON.stringify(addMoreOptions);
 object = eval('{' + textObject +','+ AddElement.substring(1,AddElement.length-1) + '}');
 }
 return object;
 }

addValueInObject('sdfasfas', yourObject, 'keyname');
</code></pre>

OR: 

<pre><code>var obj = {'key':'value'};

obj.key2 = 'value2';
</code></pre>

blocks|key|2834571|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834572|var+data+=+[{field:"Data",type:"date"},++{field:"Numero",type:"number"}];

var+columns+=+{};

var+index+=+0;

$.each(data,+function()+{

++++columns[index]+=+{
++++++++field+:+this.field,
++++++++type+:+this.type
++++};

++++index%2B%2B;
});

console.log(columns);|code-block|syntax|javascript|2834573|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:

<pre><code>var data = [{field:"Data",type:"date"}, {field:"Numero",type:"number"}];

var columns = {};

var index = 0;

$.each(data, function() {

 columns[index] = {
 field : this.field,
 type : this.type
 };

 index++;
});

console.log(columns);
</code></pre>

blocks|key|202705|text|如果有人想要创建一个类似的JSON，只要不使用cart作为数组，这里就是：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|202706|我有一个对象数组，myArr为：|202707|var+myArr+=+[{resourceType:"myRT",
++++++++++++id:+1,
++++++++++++value:"ha"},
++++++++++++{resourceType:"myRT",
++++++++++++id:+2,
++++++++++++value:"he"},
++++++++++++{resourceType:"myRT",
++++++++++++id:+3,
++++++++++++value:"Li"}];|code-block|syntax|javascript|202708|我将尝试创建一个具有以下结构的JSON：|202709|{
+"1":{"resourceType":"myRT","id":"1","value":"ha"},
+"2":{"resourceType":"myRT","id":"2","value":"he"},
+"3":{"resourceType":"myRT","id":"3","value":"Li"}
}|202710|你可以简单地做-|202711|var+cart+=+{};
myArr.map(function(myObj){
++++++++++++++++++++cart[myObj.id]=+myObj;
++++++++++++++++++++});|202712|entityMap^0|N|4|0|9|5|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|15|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|V|$]]

If anyone comes looking to create a similar JSON, just without using <code>cart</code> as an array, here goes:

I have an array of objects <code>myArr</code> as:

<pre><code>var myArr = [{resourceType:"myRT",
 id: 1,
 value:"ha"},
 {resourceType:"myRT",
 id: 2,
 value:"he"},
 {resourceType:"myRT",
 id: 3,
 value:"Li"}];
</code></pre>

and I will attempt to create a JSON with the following structure:

<pre><code>{
 "1":{"resourceType":"myRT","id":"1","value":"ha"},
 "2":{"resourceType":"myRT","id":"2","value":"he"},
 "3":{"resourceType":"myRT","id":"3","value":"Li"}
}
</code></pre>

you can simply do-

<pre><code>var cart = {};
myArr.map(function(myObj){
 cart[myObj.id]= myObj;
 });
</code></pre>

blocks|key|204392|text|function+addValueInObject(object,+key,+value)+{
++++var+res+=+{};
++++var+textObject+=+JSON.stringify(object);
++++if+(textObject+===+'{}')+{
++++++++res+=+JSON.parse('{"'+%2B+key+%2B+'":"'+%2B+value+%2B+'"}');
++++}+else+{
++++++++res+=+JSON.parse('{'+%2B+textObject.substring(1,+textObject.length+-+1)+%2B+',"'+%2B+key+%2B+'":"'+%2B+value+%2B+'"}');
++++}
++++return+res;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|204393|这段代码是有效的。|unstyled|204394|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>function addValueInObject(object, key, value) {
 var res = {};
 var textObject = JSON.stringify(object);
 if (textObject === '{}') {
 res = JSON.parse('{"' + key + '":"' + value + '"}');
 } else {
 res = JSON.parse('{' + textObject.substring(1, textObject.length - 1) + ',"' + key + '":"' + value + '"}');
 }
 return res;
}
</code></pre>

this code is worked.

blocks|key|199848|text|push是一种数组方法，因此对于object，您可以获得最后一个元素的索引，并且您可能可以执行与push+for+object相同的工作，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|199849|var+lastIndex+=+Object.keys(element)[Object.keys(element).length-1];|code-block|syntax|javascript|199850|然后将对象添加到元素的新索引中|199851|element[parseInt(lastIndex)+%2B1]+=+{+id:+id,+quantity:+quantity+};|199852|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

push is an method of arrays , so for object you can get the index of last element ,and you can probably do the same job as push for object as below

<pre><code>var lastIndex = Object.keys(element)[Object.keys(element).length-1];
</code></pre>

then add object to the new index of element

<pre><code>element[parseInt(lastIndex) +1] = { id: id, quantity: quantity };
</code></pre>

blocks|key|2834637|text|如果您不打算在JS中执行循环，例如传递给PHP来为您执行循环|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834638|let+decision+=+{}
decision[code%2B'#'%2Brow]+=+event.target.value|code-block|syntax|javascript|2834639|这个概念可能有点帮助。|2834640|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

if you not design to do loop with in JS e.g. pass to PHP to do loop for you

<pre><code>let decision = {}
decision[code+'#'+row] = event.target.value
</code></pre>

this concept may help a bit

blocks|key|202283|text|对于任何还在寻找解决方案的人来说，我认为对象应该存储在一个数组中，比如...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|202284|var+element+=+{},+cart+=+[];
element.id+=+id;
element.quantity+=+quantity;
cart.push(element);|code-block|syntax|javascript|202285|然后，当你想使用一个元素作为对象时，你可以这样做...|202286|var+element+=+cart.find(function+(el)+{+return+el.id+===+"id_that_we_want";});|202287|将一个变量放在"id_that_we_want“处，并为其提供我们想要从数组中获得的元素的id。返回一个"elemnt“对象。当然，我们不需要使用id来查找对象。我们可以使用任何其他属性来进行查找。|202288|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

For anyone still looking for a solution, I think that the objects should have been stored in an array like...

<pre><code>var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push(element);
</code></pre>

Then when you want to use an element as an object you can do this...

<pre><code>var element = cart.find(function (el) { return el.id === "id_that_we_want";});
</code></pre>

Put a variable at "id_that_we_want" and give it the id of the element that we want from our array. An "elemnt" object is returned. Of course we dont have to us id to find the object. We could use any other property to do the find.

blocks|key|2834683|text|使用Object.assign追加到对象|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2834684|var+ElementList+={}

function+addElement+(ElementList,+element)+{
++++let+newList+=+Object.assign(ElementList,+element)
++++return+newList
}
console.log(ElementList)|code-block|syntax|javascript|2834685|输出：|2834686|2834687|+{“元素”：{“id”：10，“数量”：1}，“元素”：{“id”：11，“数量”：2}}|blockquote|2834688|2834689|entityMap^0|2|D|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|W|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|X|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|Z|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|10|8|@]|D|@]|E|$]]|$1|R|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|S|$]]

To append to an object use <code>Object.assign</code>

<pre class="lang-js prettyprint-override"><code>var ElementList ={}

function addElement (ElementList, element) {
 let newList = Object.assign(ElementList, element)
 return newList
}
console.log(ElementList)
</code></pre>

Output:

<blockquote>
 {"element":{"id":10,"quantity":1},"element":{"id":11,"quantity":2}}
</blockquote>

blocks|key|204460|text|我正在读一些与这个尝试相关的东西，如果它有用的话。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|204461|1.定义一个对象内部的push函数。|204462|let+obj={push:function+push(element){+[].push.call(this,element)}};|code-block|syntax|javascript|204463|现在，您可以像数组一样推送元素|204464|obj.push(1)
obj.push({a:1})
obj.push([1,2,3])|204465|这将产生这个对象|204466|obj={
+0:+1
+1:+{a:+1}
+2:+(3)+[1,+2,+3]
+length:+3
}|204467|请注意，添加了索引的元素以及添加到object.This的新长度属性对于查找too.This工作的对象的长度非常有用，因为push()函数的泛型性质|offset|length|style|CODE|204468|entityMap^0|0|0|0|0|0|0|0|1P|6|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|15|8|@$S|16|T|17|U|V]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

I was reading something related to this try if it is useful.

1.Define a push function inside a object.

<pre><code>let obj={push:function push(element){ [].push.call(this,element)}};
</code></pre>

Now you can push elements like an array

<pre><code>obj.push(1)
obj.push({a:1})
obj.push([1,2,3])
</code></pre>

This will produce this object

<pre><code>obj={
 0: 1
 1: {a: 1}
 2: (3) [1, 2, 3]
 length: 3
}
</code></pre>

Notice the elements are added with indexes and also see that there is a new length property added to the object.This will be useful to find the length of the object too.This works because of the generic nature of <code>push()</code> function

blocks|key|3047447|text|这是一个古老的问题，不管怎么说，今天的最佳实践是使用Object.defineProperty|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3047448|const+object1+=+{};

Object.defineProperty(object1,+'property1',+{
++value:+42,
++writable:+false
});

object1.property1+=+77;
//+throws+an+error+in+strict+mode

console.log(object1.property1);
//+expected+output:+42|code-block|syntax|javascript|3047449|entityMap^0|Q|L|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

This is an old question, anyway today the best practice is by using Object.defineProperty

<pre><code>const object1 = {};

Object.defineProperty(object1, 'property1', {
 value: 42,
 writable: false
});

object1.property1 = 77;
// throws an error in strict mode

console.log(object1.property1);
// expected output: 42
</code></pre>

blocks|key|204502|text|向原始object添加新的密钥/对元素|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|204503|const+obj+=+{+a:1,+b:2+}
const+add+=+{+c:3,+d:4,+e:+['x','y','z']+}

Object.entries(add).forEach(([key,value])+=>+{+obj[key]+=+value+})|code-block|syntax|javascript|204504|obj新值：|BOLD|204505|{a:+1,+b:+2,+c:+3,+d:+4,+e:+['x',+'y',+'z']+}|204506|entityMap^0|3|6|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|U|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|V|8|@$9|W|A|X|B|M]]|D|@]|E|$]]|$1|N|3|O|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|P|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|Q|$]]

Adding new key/pair elements into the original <code>object</code>:
<pre><code>const obj = { a:1, b:2 }
const add = { c:3, d:4, e: ['x','y','z'] }

Object.entries(add).forEach(([key,value]) =&gt; { obj[key] = value })
</code></pre>
obj new value:
<pre><code>{a: 1, b: 2, c: 3, d: 4, e: ['x', 'y', 'z'] }
</code></pre>

blocks|key|3047503|text|我的建议是使用其他答案中已经提出的不同的数据结构-它允许您在card.elements上进行推送，并允许扩展卡片属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3047504|​|3047505|let+card+=+{
++elements:+[
++++{"id":10,"quantity":1}
++],

++//other+card+fields+like+'owner'+or+something...
}

card.elements.push({"id":22,"quantity":3})

console.log(card);|code-block|syntax|javascript|3047506|3047507|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

My proposition is to use different data structure that proposed already in other answers - it allows you to make push on card.elements and allow to expand card properties:
<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>let card = {
 elements: [
 {"id":10,"quantity":1}
 ],

 //other card fields like 'owner' or something...
}

card.elements.push({"id":22,"quantity":3})

console.log(card);</code></pre>
</div>
</div>

blocks|key|2834851|text|如果其他人需要这个，我终于找到了一个添加对象或对象数组的好方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834852|var+myobj+=+{}

//+These+two+options+only+work+for+single-valued+keys,+not+arrays+or+objects
myobj["a"]+=+1
myobj.b+=+2

//+This+one+works+for+everyting:
Object.assign(myobj,+{"key":+"value"});++//+single-value

//+Add+object
Object.assign(myobj,+{"subobj":+
++{
++++"c":+3
++}
});

//+Add+array+of+objects
Object.assign(myobj,+{"subarr":+
++[
++++{
++++++"d":+4,
++++},
++++{
++++++"e":+5
++++}
++]
});+|code-block|syntax|javascript|2834853|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In case anyone else needs this, I finally found a good way to add objects or arrays of objects:
<pre><code>var myobj = {}

// These two options only work for single-valued keys, not arrays or objects
myobj[&quot;a&quot;] = 1
myobj.b = 2

// This one works for everyting:
Object.assign(myobj, {&quot;key&quot;: &quot;value&quot;}); // single-value

// Add object
Object.assign(myobj, {&quot;subobj&quot;: 
 {
 &quot;c&quot;: 3
 }
});

// Add array of objects
Object.assign(myobj, {&quot;subarr&quot;: 
 [
 {
 &quot;d&quot;: 4,
 },
 {
 &quot;e&quot;: 5
 }
 ]
}); 
</code></pre>

I need to populate a json file, now I have something like this:

<pre><code>{"element":{"id":10,"quantity":1}}
</code></pre>

And I need to add another "element". My first step is putting that json in a Object type using <code>cart = JSON.parse</code>, now I need to add the new element.
I supposed I must use <code>cart.push</code> to add another element, I tried this:

<pre><code>var element = {};
element.push({ id: id, quantity: quantity });
cart.push(element);
</code></pre>

But I got error "Object has no method push" when I try to do <code>element.push</code>, and I think I'm doing something VERY wrong because I'm not telling the "element" anywhere.

How can I do that?

Edit: sorry to all I had a LOT of confusion in my head.

I thought I can get only object type when taking data from <code>JSON.parse</code>, but I get what I put in the JSON in the first place.

Putting array instead of object solved my problem, I used lots of suggestions got here too, thank you all!

Adding elements to object

数据结构

JSON

我需要填充一个json文件，现在我得到了如下内容：{"element":{"id":10,"quantity":1}}我需要添加另一个“元素”。我的第一步是使用cart = JSON.parse将该json放入对象类型中，现在我需要添加新元素。我想我必须使用cart.push来添加另一个元素，我尝试了这样：var el...

问将元素添加到对象
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