您可以使用Array.reduce()来执行以下操作：

const value = path.reduce((accum, key) => accum[key], string)

有几种方法。首先，你可以使用一个循环来逐步遍历路径，如下所示：

const obj = { "string2": { "value": "Message" } };
const path = [ "string2", "value" ];

let output = obj;
path.forEach(key => {
    output = output[key];
});

console.log( output );

递归

const obj = { "string2": { "value": "Message" } };
const path = [ "string2", "value" ];

const trav = (o,p,i) => (i < p.length - 1) ? trav(o[p[i]],p,i+1) : o[p[i]];

console.log( trav(obj,path,0) );

新功能

const obj = { "string2": { "value": "Message" } };
const path = [ "string2", "value" ];

const output = (new Function(`return (obj.${path.join('.')})`))();

console.log( output );