英文:
Difference between .at(index) and .charAt(index)
问题
这两个函数之间的唯一区别是我在[文档][1]中找到的，即`.at()`接受负索引，还有其他区别吗？
[1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
英文:
What is the difference between the following two functions?
let str = 'hello world';
str.at(6) // w
str.charAt(6) // w
The only difference that I can find in the documentation is that .at() accepted negative indices, is there another difference?
答案1
得分: 1
这里有一些我能回忆起的事情：
- 显然浏览器支持，
at()是较新的 - 当超出范围时，
at()返回undefined而charAt()返回空字符串 - 负索引（你已经提到了）
英文:
There are few things I can recall:
- obviously browser support,
at()is newer - when out of range,
at()returnsundefinedandcharAt()returns an empty string - negative indices (already mentioned by you)
答案2
得分: 0
这两种方法都会返回一个新的字符串，其中包含位于指定偏移量位置的单个UTF-16编码字符。
区别在于 .at 允许使用负数，它是一个较新的特性，因此某些旧版本的引擎可能不支持它。
另一个区别是，如果作为参数提供的数字超出了字符串的长度，.at 将返回 undefined，而 .charAt 将返回一个空字符串。
你可以在这里找到更多信息（.at()）和这里（.charAt()）。
英文:
Both methods will return a new string consisting of a single UTF-16 encoded character located at the specified offset o the string.
The difference is that .at accepts negative numbers, and it is a much newer feature, so older versions of some engines might not support it.
Another difference is the default value returned if the number provided as a parameter exceeds the length of the string. .at will return undefined while .charAt will return an empty string.
You can find more information here (.at()) and here (.charAt())
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