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                ## ds_map_find_value——獲取鍵對應的值 *在指定映射表中指定查詢某個鍵對應的值* #### **語法:** ```javascript ds_map_find_value(id, key) ``` 參數 | 描述 |---|---| id | 需要處理的映射表的索引ID key|需要查詢其值的鍵名 #### **返回:** Real, string or undefined #### **描述:** 這個方法會返回在指定映射表中查詢某個鍵對應的值,輸入的鍵名必須是原先就存在與映射表中的。 注意:如果映射表中沒有指定的鍵名,則會返回"<undefined>",你可以用"is_undefined"來檢驗這個結果。 #### **示例:** ```javascript amount = ds_map_find_value(inventory, "food"); ``` 或也可以使用通配符"?" ```javascript amount = inventory[? "food"]; ``` 以上代碼在"inventory"這一映射表中獲取"food"這個鍵名對應的值,然后將返回的內容存到變量"amount"中
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