javascript - 用空格替换破折号(连字符) [英] javascript - replace dash (hyphen) with a space

问题描述

我一直在寻找这个，虽然我发现了许多将空格更改为破折号(连字符)的回应，但我没有找到任何相反的回应.

I have been looking for this for a while, and while I have found many responses for changing a space into a dash (hyphen), I haven't found any that go the other direction.

最初我有:

var str = "This-is-a-news-item-";

我尝试将其替换为:

str.replace("-", ' ');

并简单地显示结果:

alert(str);

现在，它什么也没做，所以我不知道该去哪里.我尝试反转一些现有的用破折号替换空格的方法，但也不起作用.

Right now, it doesn't do anything, so I'm not sure where to turn. I tried reversing some of the existing ones that replace the space with the dash, and that doesn't work either.

感谢您的帮助.

推荐答案

这修复了它:

let str = "This-is-a-news-item-";
str = str.replace(/-/g, ' ');
alert(str);

您的代码有两个问题:

1. 首先，String.replace() 不会改变字符串本身，它返回一个改变的字符串.
2. 第二，如果你将一个字符串传递给替换函数，它只会替换它遇到的第一个实例.这就是为什么我通过 正则表达式和 g 标志，用于全局"，以便替换所有实例.

1. First, String.replace() doesn’t change the string itself, it returns a changed string.
2. Second, if you pass a string to the replace function, it will only replace the first instance it encounters. That’s why I passed a regular expression with the g flag, for 'global', so that all instances will be replaced.

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