解析多层属性，类似angularJS的$parse服务

parser.js

function parse(properties) {
  const agm = properties.split('.');

  return function(target, undefined) {
    let result = null;
    (function parseTarget(target, agm) {
      if (target === void 0) {
        console.error(
          'Uncaught TypeError: Cannot read property ' + agm[0] + ' of undefined'
        );
        result = target;
        return result;
      }
      if (agm.length <= 1) {
        result = target[agm[0]];
        return result;
      }
      target = target[agm[0]];
      agm.shift();
      parseTarget(target, agm);
    })(target, agm);

    return result;
  };
}

const o = {
  a: {
    b: {
      c: 233
    }
  }
};

console.log(parse('a.b.c')(o)); // 233