按數字字段按降序或升序對數組Angular 7進行排序

Question

我需要幫助，我需要按PendingQuantity字段對數組進行排序。 我有負數和正數。 所以我的代碼：

this.data.Products.sort(obj => obj.PendingQuantity);

所以我的數組

"Products": [
            {
                "ProductCode": "MC30180",
                "Description": "Description_1",
                "NationalCode": "N.C. 0965",
                "PendingQuantity": 20,
                "toBeScanned": true
            },
            {
                "ProductCode": "Name_2",
                "Description": "Description_2",
                "NationalCode": "N.C. 0382",
                "PendingQuantity": -3,
                "toBeScanned": false
            },
            {
                "ProductCode": "Name_3",
                "Description": "Description_3",
                "NationalCode": "N.C. 8913",
                "PendingQuantity": 25,
                "toBeScanned": false
            }
        ]

我要的順序是：

"Products": [
                {
                    "ProductCode": "MC30180",
                    "Description": "Description_1",
                    "NationalCode": "N.C. 0965",
                    "PendingQuantity": -3,
                    "toBeScanned": true
                },
                {
                    "ProductCode": "Name_2",
                    "Description": "Description_2",
                    "NationalCode": "N.C. 0382",
                    "PendingQuantity": 25,
                    "toBeScanned": false
                },
                {
                    "ProductCode": "Name_3",
                    "Description": "Description_3",
                    "NationalCode": "N.C. 8913",
                    "PendingQuantity": 20,
                    "toBeScanned": false
                }
            ]

Answer 1

您可以將其用於訂單asc product = product.sort((a, b) => a.PendingQuantity - b.PendingQuantity);

如果product = product.sort((a, b) => b.PendingQuantity - a.PendingQuantity); desc訂購，請使用product = product.sort((a, b) => b.PendingQuantity - a.PendingQuantity);

更新：

如果顯示自定義順序（如-3、25、20），則可以處理排序條件。

product = product.sort((a, b) => { if (a.PendingQuantity < 0) {return -1; } if (b.PendingQuantity <0 ) {return 1;} return b.PendingQuantity - a.PendingQuantity });

 let product = [ { "ProductCode": "MC30180", "Description": "Description_1", "NationalCode": "NC 0965", "PendingQuantity": 20, "toBeScanned": true }, { "ProductCode": "Name_2", "Description": "Description_2", "NationalCode": "NC 0382", "PendingQuantity": -3, "toBeScanned": false }, { "ProductCode": "Name_3", "Description": "Description_3", "NationalCode": "NC 8913", "PendingQuantity": 25, "toBeScanned": false } ]; product = product.sort((a, b) => a.PendingQuantity - b.PendingQuantity); product = product.sort((a, b) => { if (a.PendingQuantity < 0) {return -1; } if (b.PendingQuantity <0 ) {return 1;} return b.PendingQuantity - a.PendingQuantity }); console.log(product); 

Answer 2

您可以使用Array sort功能

products.sort((a,b)=> a['PendingQuantity'] - b['PendingQuantity']);