替换,(逗号)by。(点)和。(点)by,(逗号) [英] Replace ,(comma) by .(dot) and .(dot) by ,(comma)
问题描述
我的字符串为1,23,45,448.00
,我想用小数点替换所有逗号,用逗号替换所有小数点。
I've a string as "1,23,45,448.00"
and I want to replace all commas by decimal point and all decimal points by comma.
我要求的输出是1.23.45.448,00
My required output is "1.23.45.448,00"
我试图替换,
按。
如下:
var mystring = "1,23,45,448.00"
alert(mystring.replace(/,/g , "."));
但是,之后,如果我尝试更换。
by ,
它还替换了第一个被替换的。
由,
导致输出为1,23,45,448,00
But, after that, if I try to replace .
by ,
it also replaces the first replaced .
by ,
resulting in giving the output as "1,23,45,448,00"
推荐答案
使用替换
并使用回调函数替换,
。 / code>和
。
按,
。函数返回的值将用于替换匹配的值。
Use replace
with callback function which will replace ,
by .
and .
by ,
. The returned value from the function will be used to replace the matched value.
var mystring = "1,23,45,448.00";
mystring = mystring.replace(/[,.]/g, function (m) {
// m is the match found in the string
// If `,` is matched return `.`, if `.` matched return `,`
return m === ',' ? '.' : ',';
});
//ES6
mystring = mystring.replace(/[,.]/g, m => (m === ',' ? '.' : ','))
console.log(mystring);
document.write(mystring);
正则表达式:正则表达式 [,.]
将匹配任何一个逗号或小数点。
Regex: The regex [,.]
will match any one of the comma or decimal point.
String#replace()
,函数为ca llback将获得匹配参数( m
),这是,
或。
并且从函数返回的值用于替换匹配。
String#replace()
with the function callback will get the match as parameter(m
) which is either ,
or .
and the value that is returned from the function is used to replace the match.
因此,当第一个时,$来自字符串的c $ c>
m = ',';
在函数中返回m ===','? '。':',';
相当于
if (m === ',') {
return '.';
} else {
return ',';
}
所以,基本上这是替换,
by 。
和。
by ,
in字符串。
So, basically this is replacing ,
by .
and .
by ,
in the string.
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