从对象中检索选择器指向的属性。

如果该属性不存在则返回 undefined 。

const select = (from, selector) =>
  selector.split('.').reduce((prev, cur) => prev && prev[cur], from);

const obj = { selector: { to: { val: 'val to select' } } };
select(obj, 'selector.to.val'); // 'val to select'

更多代码 JavaScript 实用代码片段 请查看 https://www.html.cn/30-seconds-of-code/