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                1.和parseInt基本相同,不過它僅支持將輸入值轉化為10進制,所以該函數只有一個參數 ``` >>> parseFloat('123'); 123 >>> parseFloat('1.23'); 1.23 ``` 2.parseFloat在遇到第一個異常字符時就會放棄,無論剩余那部分字符串是否可用。 ``` >>> parseFloat('a.bc123'); NaN >>> parseFloat('123a.bc'); 123 ``` 3.parseFloat接受指數形式的數據,而parseInt不支持 ``` >>> parseFloat('123e-2'); 1.23 >>> parseFloat('1e3'); 1000 >>> parseInt('1e3'); 1 ```
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