javascript - 为什么计数器没有在我的循环中重置？

Question

我有一组货件，我正在该数组上运行一个循环来查找具有多个包裹的货件，以便我可以将它们克隆到一个新数组中。我需要处理运输标签，为数组中的每个对象生成一个标签。

我添加了一个新的键/值对来显示计数器中的单个包裹编号，但我所有的“BAG INDEX”都具有相同的编号

// Function to sort the concatenated array
    function compare( a, b ) {
  if ( a["SNAP ID"] < b["SNAP ID"] ){
    return -1;
  }
  if ( a["SNAP ID"] > b["SNAP ID"] ){
    return 1;
  }
  return 0;
}

// Demo shipments array
var shipments = [{
    "SNAP ID": "1234567890",
    "FULL NAME": "Person 1",
    "PACKAGE QTY": 5
    },
    {
        "SNAP ID": "0987654321",
        "FULL NAME": "Person 2",
        "PACKAGE QTY": 2
    },
    {
        "SNAP ID": "5432167890",
        "FULL NAME": "Person 3",
        "PACKAGE QTY": 3
    }
];

// Empty array which will contain cloned shipment objects
var data = [];

// Running loop on the shipments array
for (var i = 0; i < shipments.length; i++) {

        var Pkg = shipments[i]["PACKAGE QTY"]
        var shipment = shipments[i]
        shipment["BAG INDEX"] = 1

    // Running loop on the shipments containing more the 1 packages
    if (Pkg > 1) {

        for (var k = 0; k < (Pkg - 1); k++) {

            data.push(shipment);
            shipment["BAG INDEX"] += 1; 

            };
        };
    };

    var complete = shipments.concat(data);
    var sorted = complete.sort(compare);
    console.log(sorted);

这就是我要回来的

0: {SNAP ID: "0987654321", FULL NAME: "Person 2", PACKAGE QTY: 2, BAG INDEX: 2}
1: {SNAP ID: "0987654321", FULL NAME: "Person 2", PACKAGE QTY: 2, BAG INDEX: 2}
2: {SNAP ID: "1234567890", FULL NAME: "Person 1", PACKAGE QTY: 5, BAG INDEX: 5}
3: {SNAP ID: "1234567890", FULL NAME: "Person 1", PACKAGE QTY: 5, BAG INDEX: 5}
4: {SNAP ID: "1234567890", FULL NAME: "Person 1", PACKAGE QTY: 5, BAG INDEX: 5}
5: {SNAP ID: "1234567890", FULL NAME: "Person 1", PACKAGE QTY: 5, BAG INDEX: 5}
6: {SNAP ID: "1234567890", FULL NAME: "Person 1", PACKAGE QTY: 5, BAG INDEX: 5}
7: {SNAP ID: "5432167890", FULL NAME: "Person 3", PACKAGE QTY: 3, BAG INDEX: 3}
8: {SNAP ID: "5432167890", FULL NAME: "Person 3", PACKAGE QTY: 3, BAG INDEX: 3}
9: {SNAP ID: "5432167890", FULL NAME: "Person 3", PACKAGE QTY: 3, BAG INDEX: 3}
length: 10

Answer 1

您必须创建对象的副本。否则，您还将增加已添加到 data 数组中的对象的 BAG INDEX。

简单地使用:

data.push(Object.assign({}, shipment));