新增于: v14.18.0
在用 Unicode “替换字符” U+FFFD 替换任何代理代码点(或等效地,任何未配对的代理代码单元)后返回 string
。
Added in: v14.18.0
Returns the string
after replacing any surrogate code points
(or equivalently, any unpaired surrogate code units) with the
Unicode "replacement character" U+FFFD.