使用javascript遍历json -查找具有特定父值的子项

var jsonData = '{"employees":[{"firstName":"John","lastName":"Doe"},{"firstName":"Anna","lastName":"Smith"},{"firstName":"Peter","lastName":"Jones"}]}';
var data = JSON.parse(jsonData);

function traverse(obj, parentValue) {
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      var value = obj[key];
      if (typeof value === 'object') {
        traverse(value, parentValue);
      } else {
        if (key === 'parent' && value === parentValue) {
          console.log(obj);
        }
      }
    }
  }
}

traverse(data, 'John');