JavaScript - 替换字符串中的所有逗号
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JavaScript - Replace all commas in a string
提问by mike
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. Any thoughts?
文档说明默认替换全部，“-1”也表示替换全部，但是不成功。有什么想法吗？
回答by VisioN
The third parameter of String.prototype.replace()function was never defined as a standard, so most browsers simply do not implement it.
String.prototype.replace()function的第三个参数从未被定义为标准，因此大多数浏览器根本没有实现它。
The best way is to use regular expressionwith g(global) flag.
最好的方法是使用带有( global) 标志的正则表达式。g
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. 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).
需要注意的是，正则表达式使用需要转义的特殊字符。例如，如果您需要转义点 ( .) 字符，则应使用/\./字面量，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 RegExpobject 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.
如果您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对象并将字符串作为构造函数的第一个参数传递。正常的字符串转义规则（\包含在字符串中时的特殊字符前面）将是必要的。
var myStr = 'this.is.a.test';
var reStr = '\.';
var newStr = myStr.replace(new RegExp(reStr, 'g'), '-');
console.log( newStr ); // "this-is-a-test"回答by RobG
Just for fun:
只是为了好玩：
var mystring = "this,is,a,test"
var newchar = '|'
mystring = mystring.split(',').join(newchar);
回答by gdoron is supporting Monica
var mystring = "this,is,a,test"
mystring.replace(/,/g, "newchar");
Use the global(g) flag
使用 global( g) 标志
