编写parse函数，实现访问对象里属性的值。

Question

编写parse函数，实现访问对象里属性的值，请教哪位大咖可以帮我下，感激感激！

Answer 1

let obj = { a: 1, b: { c: 2 }, d: [1, 2, 3], e: [{ f: [4, 5, 6] }] };
let r1 = parse(obj, 'a');// = 1;
let r2 = parse(obj, 'b.c');// = 2;
let r3 = parse(obj, 'd[2]');// = 3;
let r4 = parse(obj, 'e[0].f[0]');// = 4;

function parse(obj, str) {
    return new Function('obj', 'return obj.' + str.replace(/\.(\d+)/g, '\[$1\]'))(obj);
}
function parse(obj, str) {
    str = str.replace(/\[(\d+)\]/g, '.$1');
    arr = str.split('.');
    arr.forEach(function (item) {
        obj = obj[item];
    })
    return obj;
}

console.log(r1, r2, r3, r4);