JS String.replace and escaping $

Node version:
[vova7890@dell-i7 tmp]$ cat test.js

var xx = "${test}";
var ret = "$12";
var j = xx.replace("${test}", ret);

console.log('result', j);

[vova7890@dell-i7 tmp]$ node test.js
result $12

Qt version print this:
result 2