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Update string-methods.md

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ConradZhangcong 2021-11-16 15:55:20 +08:00
parent 79e871c872
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docs/string-methods.md
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@ -443,8 +443,8 @@ str.replaceAll(regex, replacer)
```javascript
const str = 'hello';
str.at[1] // "e"
str.at[-1] // "o"
str.at(1) // "e"
str.at(-1) // "o"
```
如果参数位置超出了字符串范围，`at()`返回`undefined`。