list怎么精度求和，保留两位小数

Question

怎么精度求和，pic可能是字符串，可能输数字，保留两位小数

list = [
    {
        name:'1',
        pic:'22.21'
    },
    {
        name:'2',
        pic:11.2
    }
]

Answer 1

代码

list = [
    {
        name:'1',
        pic:'22.21'
    },
    {
        name:'2',
        pic:11.2
    }
];
list.reduce((acc,cur)=>acc + Number(cur.pic),0).toFixed(2);

结果
33.41

Answer 2

list.reduce((num, item) => num + Number(item.pic), 0).toFixed(2)

Answer 3

js里涉及小数计算的建议都用库，比如big.js、Decimal.js

Answer 4

list.reduce((acc, cur) => acc + Number(cur.pic), 0).toFixed(2)

有关reduce方法可以参考 reduce

Answer 5

浮点数计算容易丢失精度，建议引入库来解决问题。比如big.js。