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@ -443,8 +443,8 @@ str.replaceAll(regex, replacer)
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```javascript
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const str = 'hello';
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str.at[1] // "e"
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str.at[-1] // "o"
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str.at(1) // "e"
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str.at(-1) // "o"
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```
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如果参数位置超出了字符串范围,`at()`返回`undefined`。
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