Usage of replace() assignment in js

<script>var str = "a1ba2b";var reg = /a.b/g;
str = str.replace(reg,function(a,b){
    console.log(a);
    console.log(b);    return b == 0 ? a.replace("a","0") : a.replace("b","3");
});
console.log(str);/*
输出结果为：
a1b
0//第一次匹配到a1b，将a置为0.
a2b
3//第二次匹配到a2b，将b置为3.
01ba23//返回经过修改后的字符串
*//*
function（a,b,c）一共可以传入3个参数，第一个为匹配的字符串，第二个为匹配字符串的起始位置，
第三个为调用replace方法的字符串本身。可以缺省c或b、c。
*/</script>

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