关于数组数据结构转换的问题

Question

原始数据是这样的我想要转成这样怎么弄啊

Answer 1

var A = [{a: 1}, {b: 2}, {c: 3}];//原始数据

var B = {};

A.forEach(function (item) {

    var key = Object.keys(item);

    B[key[0]] = item[key[0]];

});

A = B;

Answer 2

A = A.reduce((x, y) => Object.assign(x, y))