var str = "100000000000";
var reg = /(?=(\B)(\d{3})+$)/g;
console.log(str.replace(reg, "."))
var str = "100000000000";
var reg = /(?=(\B)(\d{3})+$)/g;
console.log(str.replace(reg, "."))
本文标题：一串数字，每隔三位加一个.
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