javascript - 如何添加数组的对象属性并更新它？

Question

我有一个对象数组，我想通过添加月份来更新Total值

var arrObj=[
  {name:"ABC",Jan:0,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0},
    {name:"BCD",Jan:10,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0},
   {name:"DEF",Jan:10,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0},
   {name:"FGH",Jan:10,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0}
]

我正在使用循环更新值，它也可以工作，但是有没有最好的方法来实现这个？

var len=arrObj.length;
var Total=0;
for(var i=0;i<len;i++){
arrObj[i].Total= +arrObj[i].Jan + +arrObj[i].Feb + +arrObj[i].Mar+ +arrObj[i].Apr+ +arrObj[i].May+ +arrObj[i].Jun+ +arrObj[i].Jul+ +arrObj[i].Aug+ +arrObj[i].Sep+ +arrObj[i].Oct+ +arrObj[i].Nov+ +arrObj[i].Dec;
}
console.log(arrObj)

var arrObj=[
  {name:"ABC",Jan:0,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0},
    {name:"BCD",Jan:10,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0},
   {name:"DEF",Jan:10,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0},
   {name:"FGH",Jan:10,Feb:20,Mar:30,Apr:40,May:50,Jun:70,Jul:80,Aug:90,Sep:100,Oct:110,Nov:120,Dec:130,Total:0}
]
var len=arrObj.length;
var Total=0;
for(var i=0;i<len;i++){
arrObj[i].Total= +arrObj[i].Jan + +arrObj[i].Feb + +arrObj[i].Mar+ +arrObj[i].Apr+ +arrObj[i].May+ +arrObj[i].Jun+ +arrObj[i].Jul+ +arrObj[i].Aug+ +arrObj[i].Sep+ +arrObj[i].Oct+ +arrObj[i].Nov+ +arrObj[i].Dec;
}
console.log(arrObj)

Answer 1

您可以定义一个函数来获取每个对象的总计

const getTotal = obj => {
    let total = 0;
    const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
    months.forEach(month => total += obj[month]);
    return total;
}

然后像这样使用它

arrObj.forEach(obj => obj.total = getTotal(obj));