javascript - 如何在 Javascript 中合并两个字典？

Question

var a = {};
a['fruit'] = "apple";

var b = {};
b['vegetable'] = "carrot";

var food = {};

输出变量“food”必须包含两个键值对。

Answer 1

您可以使用Object.assign .

var a = { fruit: "apple" },
    b = { vegetable: "carrot" },
    food = Object.assign({}, a, b);

console.log(food);

对于不支持Object.assign的浏览器，您可以迭代属性并手动分配值。

var a = { fruit: "apple" },
    b = { vegetable: "carrot" },
    food = [a, b].reduce(function (r, o) {
        Object.keys(o).forEach(function (k) { r[k] = o[k]; });
        return r;
    }, {});

console.log(food);