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                indexOf與includes方法 indexOf索引值 includes:包含 概述:他們兩者也是數組的方法。他們兩者作用分別是: indexOf:它可以獲取數組當中某一個元素的索引值【下腳標】 includes:它主要的作用元素不是當前數組的,如果是返回true 如果不是返回false 語法 ## 數組.idnexOf("元素值"); 語法: ## 數組.includes("元素值"); ``` var abc=["吃飯","睡覺","打豆豆"]; console.log(abc.indexOf("吃飯")); ``` ``` var abc=["吃飯","睡覺","打豆豆"]; console.log(abc.indexOf("吃飯")); //includes 檢 console.log(abc.includes("吃飯")) //返回布爾值true ```
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