SOURCE

var x = [
    {
        "cumulativeCustomerNum": "10147",
        "addCustomerAdd": "4",
        "drainCustomerNum": "6",
        "salesmanDeleteCustomerNum": "5",
        "customerDeleteSalesmanNum": "7",
        "salesManName": null,
        "salesmanId": "0",
        "deport": null,
        "dateString": "2022-05-11"
    },
    {
        "cumulativeCustomerNum": "10148",
        "addCustomerAdd": "6",
        "drainCustomerNum": "5",
        "salesmanDeleteCustomerNum": "3",
        "customerDeleteSalesmanNum": "3",
        "salesManName": null,
        "salesmanId": "0",
        "deport": null,
        "dateString": "2022-05-10"
    }
]

var arr = [...x];
x.map((item,index)=>{
    Object.entries(item).forEach(entry => {
        console.log(entry);
        if(parseFloat(entry[1]) == entry[1]){
            arr[index].entry[0] = parseFloat(entry[1]);
        }else{
            arr[index].entry[0] = entry[1];
        }
    });
})


console.log(arr)