对于这种特定情况，如何使用 JavaScript 替换字符串中的所有字符：replace 。经过 _
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How to replace all characters in a string using JavaScript for this specific case: replace . by _
提问by Kevin Le - Khnle
The following statement in JavaScript works as expected:
JavaScript 中的以下语句按预期工作：
var s1 = s2.replace(/ /gi, '_'); //replace all spaces by the character _
However, to replace all occurrences of the character . by the character _, I have:
但是，要替换所有出现的字符 . 通过字符_，我有：
var s1 = s2.replace(/./gi, '_');
But the result is a string entirely filled with the character _
但结果是一个完全用字符 _ 填充的字符串
Why and how to replace . by _ using JavaScript?
为什么以及如何更换 . 通过 _ 使用 JavaScript？
回答by Jacob Mattison
The . character in a regex will match everything. You need to escape it, since you want a literal period character:
这 。正则表达式中的字符将匹配所有内容。你需要转义它，因为你想要一个文字句点字符：
var s1 = s2.replace(/\./gi, '_');
回答by SilentGhost
you need to escape the dot, since it's a special character in regex
您需要转义点，因为它是正则表达式中的特殊字符
s2.replace(/\./g, '_');
Note that dot doesn't require escaping in character classes, therefore if you wanted to replace dots and spaces with underscores in one go, you could do:
请注意，点不需要在字符类中转义，因此如果您想一次性用下划线替换点和空格，您可以这样做：
s2.replace(/[. ]/g, '_');
Using iflag is irrelevant here, as well as in your first regex.
i在这里以及在您的第一个正则表达式中使用标志都无关紧要。
回答by dbrown0708
You can also use strings instead of regular expressions.
您还可以使用字符串代替正则表达式。
var s1 = s2.replace ('.', '_', 'gi')
回答by HoLyVieR
There is also this that works well too :
还有这个也很好用：
var s1 = s2.split(".").join("_"); // Replace . by _ //
