How do I hook these js methods/functions with Frida?

I want to hook these methods for the purpose to log the string variables (str) just before they are encrypted by a function (encr). I'm showing only the relevant parts for simplicity.

1-

 protected static String m1a(String str, String str2, String str3) { ... String str5 = ("dev=" + URLEncoder.encode(encr.mc(C20.f50)) ... 

2-

public final class a1c { public static String ma(String str) { return encr.m6b(str); } } 

3-

private void me(String str, String str2) { md(encr.m6a(str.substring(4)), str2); }