Question

如何在JavaScript中将像这样的字符串""0.children.13.children.0"解析到数组项的路径？示例："0.children.13.children.0"> arr[0].children[13].children[0] 预先感谢！

Answer 1

如果对象的键中有点，如.，则使用一个字符串在{'first.name':'John'}上分割可能会损坏，因此最好为数组提供字符串/整数。

这是lodash get的一种实现，不同之处在于它只将path作为字符串：

var data = [
  {
    children: [
      {
        children: [{ name: 'got it' }],
      },
    ],
  },
  null,
];
const get = (object, path = '', defaultValue) => {
  const recur = (object, path, defaultValue) => {
    if (typeof object !== 'object') {
      return defaultValue;
    }
    if (path.length === 0) {
      return object;
    }
    if (object !== null && path[0] in object) {
      return recur(
        object[path[0]],
        path.slice(1),
        defaultValue,
      );
    }
    return defaultValue;
  };
  return recur(object, path.split('.'), defaultValue);
};
console.log(get(undefined, '', 'Hello World'));//defaults to hello world
console.log(get(data, 'does.not.exist', 'Hello World'));//defaults to hello world
console.log(get(data, '1', 'Hello World'));//will be null (data[0] is null)
console.log(get(data, '1.anything', 'Hello World'));//defaults to hello world
console.log(//gets item data[0].children[0].children[0]
  get(data, '0.children.0.children.0', 'Hello World'),
);

从字符串解析键路径到数组项

1 个答案: