Detailed explanation of the usage of Replace in JS when passing in functions

The syntax of the replace method is:(rgExp, replaceText)instringObjIt's a string(string), reExp can be a regular expression object (RegExp) or a string (string), replaceText is a string instead of the found. .

I won’t say much nonsense, I will just post the code to you. The specific code is as follows:

 <script>
var str = "a1ba2b";
var reg = //g;
str = (reg,function(a,b){
 (a);
 (b);
 return b == 0 ? ("a","0") : ("b","3");
});
(str);
/*
 The output result is:
 a1b
 0//The first time it matches a1b, set a to 0.
 a2b
 3//The second time matches a2b, set b to 3.
 01ba23//Returns the modified string
 */
/*
 Function(a,b,c) can pass in a total of 3 parameters. The first is the matching string and the second is the starting position of the matching string.
 The third is the string itself that calls the replace method.  C or b and c can be defaulted.
 */
</script>

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