https://github.com/qingyangmoke/deepquery

javascript safety deep query 深度查询
https://github.com/qingyangmoke/deepquery

javascript query safe

Last synced: 21 days ago
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javascript safety deep query 深度查询

• Host: GitHub
• URL: https://github.com/qingyangmoke/deepquery
• Owner: qingyangmoke
• License: mit
• Created: 2018-07-24T09:31:03.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2019-10-29T21:21:43.000Z (over 5 years ago)
• Last Synced: 2025-04-01T22:38:34.137Z (about 1 month ago)
• Topics: javascript, query, safe
• Language: JavaScript
• Homepage:
• Size: 20.5 KB
• Stars: 4
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# deepquery

> 深度拷贝

## 安装

```

  npm i deepquery --save

```

## 使用

``` js

var deepQuery = require('deepquery');

```

OR

``` js

import deepQuery from 'deepquery';

```

``` js

 const obj = {

      a: 1,

      b: {

        c: 2

      },

      items: [

        {

          name: 'item1',

        }

      ]

 };

 

 // 查询多层级节点

 deepQuery(obj, "b", "c"); // ==> 2

 

 // 查询不存在的节点返回值为 undefined

 deepQuery(obj, "b", "d"); // ==> undefined

 

 // 中间节点不存在 安全返回 undefined

 deepQuery(obj, "notexists", "d"); // ==> undefined

 

 // 使用默认值 || ''  如果查询结果不存在则返回 空字符

 deepQuery(obj, "b", "d") || ''; // ==> '' 

 

 // 支持数组索引

 deepQuery(obj, "items", 0, 'name'); // ==> item1

 deepQuery(obj, "items", 1, 'name') || ''; // ==> ''

 

 // 对象是undefined

 const objUndefined;

 deepQuery(objUndefined, "b", "items", 1, 'name') || ''; // ==> ''

 

```