如何删除字符串末尾的换行符? [英] How to remove the line break at the end of a string?

问题描述

如何删除字符串末尾的换行符?我可以使用 RegEx 或 string.indexOf().

How do I remove a line break at the end of a string? I can use RegEx or string.indexOf().

到目前为止我所拥有的不起作用:

What I have so far doesn't work:

var message = "first paragraph.

Next paragraph.
";
var trimMessage = message.lastIndexOf("
")==0 ? message.substring(0, message.length-2) : message;

推荐答案

正则表达式来拯救:

var trimMessage = message.replace(/
$/, '');

$ 表示输入结束".

示例:

var message = "first paragraph.

Next paragraph.
";
var trimMessage = message.replace(/
$/, '');
var pre = document.createElement('pre');
pre.innerHTML =
  "Message:
***" + message + "**

trimMessage = ***
" + trimMessage + "***";
document.body.appendChild(pre);

您在示例中使用 -2 让我觉得您可能正在处理 换行符，或者有时可能是 有时 .或者，如果您要回到过去，只需 (旧的 Mac 操作系统，在 BSD 分支之前).要处理所有，您可以使用字符类和 + 表示一个或多个":

Your use of -2 in your example makes me think you may be dealing with linebreaks, or possibly sometimes and sometimes . Or if you're going back in time, just (old Mac OS, before the BSD fork). To handle all of those, you can use a character class and + meaning "one or more":

var trimMessage = message.replace(/[
]+$/, '');

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