javascript - JavaScript-替换字符串中的所有逗号[重复](JavaScript - Replace all commas in a string [duplicate])

Question

This question already has answers here) : 这个问题已经在这里有了答案) ：)

How to replace all occurrences of a string? 如何替换所有出现的字符串？) (59 answers) （59个回答）)

Closed 4 years ago . 4年前关闭。)

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

(我有一个带有多个逗号的字符串，字符串替换方法只会更改第一个：)

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

Result : "thisnewcharis,a,test"

(结果 ： "thisnewcharis,a,test")

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

(该文档指示默认值将替换所有，而“ -1”也指示将替换所有，但未成功。)

Any thoughts?

(有什么想法吗？)

  ask by mike translate from so

Answer 1

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

(从未将String.prototype.replace()函数的第三个参数定义为标准，因此大多数浏览器根本不实现它。)

The best way is to use regular expression with g ( global ) flag. (最好的方法是使用带有g （ global ）标志的正则表达式 。)

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

Still have issues? (还有问题吗？)

It is important to note, that regular expressions use special characters that need to be escaped .

(重要的是要注意，正则表达式使用需要转义的特殊字符 。)

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).

(例如，如果需要转义点（ . ）字符，则应使用/\./文字，因为在正则表达式语法中，点匹配任何单个字符（行终止符除外）。)

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

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 .

(如果您需要传递变量作为替换字符串，而不是使用regex文字，则可以创建RegExp对象， 并将字符串作为构造函数的第一个参数传递 。)

The normal string escape rules (preceding special characters with \ when included in a string) will be necessary.

(正常的字符串转义规则（当包含在字符串中时，必须在特殊字符前加上\ ）。)

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