# 背景服務
背景服務插件與[視窗插件](/plugin-api/zh-tw/get-started/plugin-types/window.md)開發方式類似，主要區別在於程式碼的執行時機。背景服務插件會在軟體啓動時自動啓動，而視窗插件只會在使用者點擊時執行。要新增一個背景服務插件，只需要在 `manifest.json` 中的 `main` 欄位新增 `"serviceMode": true`，如下所示：
```json
{
"main":
{
"serviceMode": true, // 主要差異
"url": "index.html",
"width": 640,
"height": 480
}
}
```
背景服務插件也能彈出視窗，你可以在這個視窗顯示當前背景任務的進度、狀態，以便使用者可以清楚地瞭解插件的當前狀態。
最終程式碼如下：
{% tabs %}
{% tab title="manifest.json" %}
```json
{
"id": "LBCZEHP8BBO94",
"version": "1.0.0",
"name": "Service Plugin",
"logo": "/logo.png",
"keywords": [],
"main":
{
"serviceMode": true,
"url": "index.html",
"width": 640,
"height": 480
}
}
```
{% endtab %}
{% tab title="index.html" %}
```html
Background services can be without UI, but you can still display the status of background services here.
```
{% endtab %}
{% tab title="plugin.js" %}
```javascript
console.log(`Plugins will be created automatically, no need for users to execute them.`);
eagle.onPluginCreate((plugin) => {
console.log('eagle.onPluginCreate');
console.log(plugin);
});
eagle.onPluginShow(() => {
console.log('eagle.onPluginShow');
});
eagle.onPluginHide(() => {
console.log('eagle.onPluginHide');
});
```
{% endtab %}
{% endtabs %}
{% hint style="info" %}
**完整範例程式碼：**
{% endhint %}
{% hint style="info" %}
注：你可以查看這篇文章，[瞭解 `manifest.json`的所有設定方式](/plugin-api/zh-tw/tutorial/manifest.md)。
{% endhint %}
{% hint style="warning" %}
**注意：** 如果插件執行過程必須依賴相對的資源庫路徑，你可能需要透過[`onLibraryChanged(callback)`](/plugin-api/zh-tw/api/event.md#g3tny)，在資源庫切換時，做出對應的調整，避免程式執行過程發生錯誤。
{% endhint %}
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