JavaScript - 替换字符串中的所有逗号 [英] JavaScript - Replace all commas in a string

问题描述

我有一个包含多个逗号的字符串，字符串替换方法只会更改第一个：

I have a string with multiple commas, and the string replace method will only change the first one:

var mystring = "this,is,a,test"
mystring.replace(",","newchar", -1)

结果：thisnewcharis，a，test

文档指示默认值替换all，并且-1也表示替换all，但是不成功。有什么想法？

The documentation indicates that the default replaces all, and that "-1" also indicates to replace all, but it is unsuccessful. Any thoughts?

推荐答案

String.prototype.replace（） 函数从未被定义为标准，所以大多数浏览器都没有实现它。

The third parameter of String.prototype.replace() function was never defined as a standard, so most browsers simply do not implement it.

var myStr = 'this,is,a,test';
var newStr = myStr.replace(/,/g, '-');

console.log( newStr );  // "this-is-a-test"

重要的是要注意，正则表达式使用需要转义的特殊字符。例如，如果你需要转义一个点（。）字符，你应该使用 / \ ./ literal，正如在regex语法中一个点匹配任何单个字符（行终止符除外）。

It is important to note, that regular expressions use special characters that need to be escaped. As an example, if you need to escape a dot (.) character, you should use /\./ literal, as in the regex syntax a dot matches any single character (except line terminators).

var myStr = 'this.is.a.test';
var newStr = myStr.replace(/\./g, '-');

console.log( newStr );  // "this-is-a-test"

如果你需要将变量作为替换字符串传递，而不是使用正则表达式文字，您可以创建 RegExp 对象和传递一个字符串作为构造函数的第一个参数。正常的字符串转义规则（包含在字符串中的 \ 之前的特殊字符）将是必要的。

If you need to pass a variable as a replacement string, instead of using regex literal you may create RegExp object and pass a string as the first argument of the constructor. The normal string escape rules (preceding special characters with \ when included in a string) will be necessary.

var myStr = 'this.is.a.test';
var reStr = '\\.';
var newStr = myStr.replace(new RegExp(reStr, 'g'), '-');

console.log( newStr );  // "this-is-a-test"

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