javascript - 如何对对象的属性值求和？

Question

我想对 PieData 的属性值求和。我的预期输出是25515512+916952499 = 942468011

var PieData = [
    {
        value: 25515512,
        color: "#00a65a",
        highlight: "#00a65a",
        label: "Received Fund"     
    },
    {
        value: 916952499,
        color: "#f56954",
        highlight: "#f56954",
        label: "Pending Fund"
    }
];

这是我尝试过的脚本:它打印未定义的值。

var total_value='';
for(var i=0;i<PieData.length;i++){
   $.each(PieData[i], function (index, val) {
       total_value += val.value;
   });
}
alert(total_value);

Answer 1

您可以使用 native 方法 Array#reduce为了它。

var PieData = [{ value: 25515512, color: "#00a65a", highlight: "#00a65a", label: "Received Fund" }, { value: 916952499, color: "#f56954", highlight: "#f56954", label: "Pending Fund" }],
    sum = PieData.reduce(function (s, a) {
        return s + a.value;
    }, 0);

console.log(sum);

ES6

var PieData = [{ value: 25515512, color: "#00a65a", highlight: "#00a65a", label: "Received Fund" }, { value: 916952499, color: "#f56954", highlight: "#f56954", label: "Pending Fund" }],
    sum = PieData.reduce((s, a) => s + a.value, 0);

console.log(sum);