75 lines
1.8 KiB
Markdown
75 lines
1.8 KiB
Markdown
# JS Filter
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轻量、易读、可解析、可执行的类 SQL 过滤语法，用于 JavaScript 数组过滤。
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## 语法特性
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- **WHERE**: 条件过滤
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- **ORDER BY**: 排序
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- **LIMIT**: 限制结果数量
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- **操作符**: `=`, `!=`, `>`, `<`, `>=`, `<=`, `IN`, `CONTAINS`, `LIKE`
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- **逻辑**: `AND`, `OR`
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## 语法示例
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```javascript
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// 基础过滤
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filter(users, "WHERE metadata.type = 'user'");
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// 多条件
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filter(users, "WHERE metadata.tags CONTAINS 'premium' AND metadata.region = 'beijing'");
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// 排序
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filter(users, "WHERE metadata.type = 'user' ORDER BY metadata.created_at DESC");
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// 限制数量
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filter(users, "WHERE metadata.type = 'user' ORDER BY metadata.created_at DESC LIMIT 10");
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// IN 操作
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filter(users, "WHERE metadata.region IN ['beijing', 'shanghai']");
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// LIKE 操作 (支持 % 匹配任意字符，_ 匹配单个字符)
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filter(products, "WHERE name LIKE '%Apple%'");
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filter(products, "WHERE name LIKE 'Apple%'");
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filter(products, "WHERE name LIKE '%Phone'");
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```
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## 使用方法
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```javascript
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import { filter } from '@kevisual/js-filter';
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const users = [
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{
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metadata: {
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tags: ['premium', 'active'],
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type: 'user',
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region: 'beijing',
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created_at: '2024-03-15T10:00:00Z',
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},
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},
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{
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metadata: {
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tags: ['free'],
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type: 'admin',
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region: 'shanghai',
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created_at: '2024-01-10T09:00:00Z',
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},
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},
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{
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metadata: {
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tags: ['enterprise', 'premium'],
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type: 'user',
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region: 'guangzhou',
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created_at: '2024-04-05T12:00:00Z',
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},
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},
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];
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// 查找 premium 用户
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const premiumUsers = filter(users, "WHERE metadata.tags CONTAINS 'premium'");
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// 查找北京的用户，按创建时间倒序
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const beijingUsers = filter(users, "WHERE metadata.region = 'beijing' ORDER BY metadata.created_at DESC");
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```
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