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                ## 代碼實現 ``` let str?=?'123abc'; functionoStr(str){ return str.split('').reverse().join('');???? } oStr(str) ``` ## 實現思路 1 首先把字符串轉為數組,使用split()方法 ``` 執行 : str.split(''); 輸入 : ["1", "2", "3", "a", "b", "c"] ``` 2 在使用數組的reverse()方法,把數組反轉 ``` 執行 : str.split('').reverse() 輸出 : ["c", "b", "a", "3", "2", "1"] ``` 3 最后使用join()方法把數組轉成字符串 ``` 執行 : str.split('').reverse().join('') 輸出 : cba321 ```
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