如何将类型为对象数组的 json 集合 arr 中的 price 属性累加计算，生成 obj_1 或 arr_1 ？
用原生 js 的 for 循环 或 underscore 如何实现？
3
1398var arr = [
{ id:1, name: '商户1', price: 400 },
{ id:3, name: '商户3', price: 200 },
{ id:2, name: '商户2', price: 100 },
{ id:1, name: '商户1', price: 200 },
{ id:4, name: '商户4', price: 800 },
{ id:2, name: '商户2', price: 600 },
{ id:1, name: '商户1', price: 400 }
];
var obj_1 = {
1: { name: '商户1', price: 1000 },
2: { name: '商户2', price: 700 },
3: { name: '商户3', price: 200 },
4: { name: '商户4', price: 800 },
}
var arr_1 = [
{ id:1, name: '商户1', price: 1000 },
{ id:2, name: '商户2', price: 700 },
{ id:3, name: '商户3', price: 200 },
{ id:4, name: '商户4', price: 800 },
];
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var arr = [ { id:1, name: '商户1', price: 400 }, { id:3, name: '商户3', price: 200 }, { id:2, name: '商户2', price: 100 }, { id:1, name: '商户1', price: 200 }, { id:4, name: '商户4', price: 800 }, { id:2, name: '商户2', price: 600 }, { id:1, name: '商户1', price: 400 } ]; var count = 0 var arr_1 = [] var obj_1 = [] for(var i=0;i
var sum = 0,arr_1=[...],arr_2=[...],arr_3=[...]; function counter(obj){ obj.forEach(function(item){ sum+=item.price; }) } counter(arr_1); counter(arr_2); counter(arr_3);试试这个
var reduced = arr.reduce(function(p, item) { if (p[item.id]) { p[item.id].price += item.price; } else { p[item.id] = {name: item.name, price: item.price}; } return p; }, {}); console.log(reduced);