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---
title: 插件
description: 插件 - PluginFinder
---
## available(pluginName)
```js
pluginFinder . available ( pluginName )
```
### 描述
判断一个插件是否可用，会同时判断插件是否安装和启用。
### 参数
1. `pluginName:string` - 插件的唯一标识 `metadata.name` 。
### 返回值
`boolean` - 插件是否可用
### 示例
```html
<!-- https://github.com/halo-sigs/plugin-search-widget -->
< li th:if = "${pluginFinder.available('PluginSearchWidget')}" >
< a href = "javascript:SearchWidget.open()" title = "搜索" >
搜索
</ a >
</ li >
```
## available(pluginName, requiresVersion)
```js
pluginFinder . available ( 'fake-plugin' , '>=2.3.0' )
```
### 描述
判断一个插件是否可用，会同时判断插件是否安装和启用且插件的版本符合 `requiresVersion` 要求，
### 参数
1. `pluginName:string` - 插件的唯一标识 `metadata.name` ，不能为空。
2. `requiresVersion:string` - 插件的版本要求，不能为空，例如：`>1.2.0`， Semantic Range Expressions ](https://github.com/zafarkhaja/jsemver#range-expressions )。
### 返回值
`boolean` - 插件是否可用
### 示例
```html
<!-- https://github.com/halo-sigs/plugin-search-widget -->
< li th:if = "${pluginFinder.available('PluginSearchWidget', '>=2.3.0')}" >
< a href = "javascript:SearchWidget.open()" title = "搜索" >
搜索
</ a >
</ li >
```
