Javascript regular expression implementation to add thousand separators to numbers_javascript skills

Recently, I saw an interview (written test) question on the Internet about using js to implement thousands separators for numbers, so I wrote a method using "regular replace" to implement it:

Copy code The code is as follows:

var thousandBitSeparator = function(numStr){
var b = /([- ]?d{3})(?=d)/g;
Return numStr.replace(b, function($0, $1){
           return $1 ',';
});
}

Supports positive and negative sign matching and decimal point distinction. If there are any errors, please point them out:-D

Attached is another netizen’s implementation method

Copy code The code is as follows:

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