現(xiàn)在有一個(gè)對(duì)象：

const obj = {
a: 1,
b: [1, 2, { c: true }],
c: { d: 1, e: 2, f: { g: 0 } },
d: null,
e: '',
};

要將其轉(zhuǎn)化為：

const result = {
a: 1,
b[0]: 1,
b[1]: 2,
b[2].c: true,
c.d: 1,
c.e: 2,
c.f.g: 0,
d: null,
e: ""
};

本質(zhì)是維護(hù)一個(gè)新返回的對(duì)象，通過遞歸將key生成后，寫入新對(duì)象中：

let res = {};
function flat(obj, type = "obj", prefix = "") {
    for (let key in obj) {
        let item = obj[key];
        let newKey = prefix ? (type === "obj" ? `${prefix}.${key}` : `${prefix}[${key}]`) : key;
        if (!(item instanceof Object)) {
            res[newKey] = item;
            continue;
        }
        if (Array.isArray(item)) {
            flat(item, "arr", newKey);
        } else if (item instanceof Object && !Array.isArray(item)) {
            flat(item, "obj", newKey);
        }
    }
}
flat(obj);
console.log("output:", res);