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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                [TOC] ## 全局 ### 聲明全局函數 支持函數重載 ``` declare function jQuery(selector: string): any; declare function jQuery(domReadyCallback: () => any): any; ``` ## `declare namespace`聲明 `Query.ajax` declare namespace 還是比較常用的,它用來表示全局變量是一個對象,包含很多子屬性 ``` // src/jQuery.d.ts declare namespace jQuery { function ajax(url: string, settings?: any): void; } ``` 多個嵌套 ``` // src/jQuery.d.ts declare namespace jQuery { function ajax(url: string, settings?: any): void; namespace fn { function extend(object: any): void; } } ``` ### 聲明 interface 和 type `type`與`interface`類似, ``` interface AjaxSettings { method?: 'GET' | 'POST' data?: any; } declare namespace jQuery { function ajax(url: string, settings?: AjaxSettings): void; } ``` ### 防止命名沖突 修改上一個示例 ``` // src/jQuery.d.ts declare namespace jQuery { interface AjaxSettings { method?: 'GET' | 'POST' data?: any; } function ajax(url: string, settings?: AjaxSettings): void; } ``` ### 聲明合并 假如 jQuery 既是一個函數,可以直接被調用 jQuery('#foo'),又是一個對象,擁有子屬性 jQuery.ajax() ``` // src/jQuery.d.ts declare function jQuery(selector: string): any; declare namespace jQuery { function ajax(url: string, settings?: any): void; } ```
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