Javascript JSON:loop Invoice Items：如果InvoiceNo不存在，则添加，如果存在，则更新值，包括示例

我正在尝试循环查看发票列表，以及它们各自的行项目值， 最后有一个[object Array]的Ojbect，带有发票号和每个发票的所有行项目的总值

var objInvoiceLineItem = function (strInvoiceNo,strValue) {
    this.InvoiceNo= strInvoiceNo;
    this.Value = strValue;
}

//

//

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我认为这样的事情可以满足你的要求：

function AddValueTo_objAllInvoices(myInvoice)
{
    for (var i = 0; i < objAllInvoices.length; i++)
    {
        if (objAllInvoices[i].InvoiceNo == myInvoice.InvoiceNo)
        {
            // invoice exists, update it and return
            objAllInvoices[i].Value += myInvoice.Value;
            return;
        }
    }

    // if the invoice already existed, we would have returned in the loop
    // so we wouldn't have ever gotten here, so the invoice must not exist.
    // create it now:
    var newObjInvoiceItem = new objInvoiceLineItem(myInvoice.Container, myInvoice.Value);
    objAllInvoices.push(newObjInvoiceItem);
}

函数AddValueTo_objAllInvoices（myInvoice）
{
for（var i=0；i

需要问一个特定的问题，让人们知道如何提供帮助。抱歉，我需要一些帮助来检查物品是否已经存在于ObjAllInvoices[]请，我想我将能够更新发票。当我获得关于物品存在的帮助时，我会进行估价。谢谢。发票号码是否保证是唯一的？

function AddValueTo_objAllInvoices(myInvoice){
    //don't know how to look and see if the Invoice exists? 
     //jQuery.inArray? 
     //for (var i = 0; i < objAllInvoices.length - 1; i++)?

    if exists (myInvoice.InvoiceNo) = false{
     var newObjInvoiceItem= 
          new objInvoiceLineItem(myInvoice.InvoiceNo, myInvoice.Value);
         objAllInvoices.push(newObjInvoiceItem)
    }
    else{
          //need help here please
         var obj = getobject;
         objAllInvoices.obj.Value += myInvoice.Value;
    }  
}

var Invoice1A = new objInvoiceLineItem("Invoice1",20);
var Invoice1B = new objInvoiceLineItem("Invoice1",50);
var Invoice2A = new objInvoiceLineItem("Invoice2",30);


AddValueTo_objAllInvoices(Invoice1A);
AddValueTo_objAllInvoices(Invoice1B);
AddValueTo_objAllInvoices(Invoice2A);

function AddValueTo_objAllInvoices(myInvoice)
{
    for (var i = 0; i < objAllInvoices.length; i++)
    {
        if (objAllInvoices[i].InvoiceNo == myInvoice.InvoiceNo)
        {
            // invoice exists, update it and return
            objAllInvoices[i].Value += myInvoice.Value;
            return;
        }
    }

    // if the invoice already existed, we would have returned in the loop
    // so we wouldn't have ever gotten here, so the invoice must not exist.
    // create it now:
    var newObjInvoiceItem = new objInvoiceLineItem(myInvoice.Container, myInvoice.Value);
    objAllInvoices.push(newObjInvoiceItem);
}