javascript - Why does getValue() return 123?

Question

    var getValue,setValue;
    (function(){
      var secret=0;
      getValue=function(){
        return secret;
      };
      setValue=function(v){
        if(typeof v==="number"){
          secret=v;
      }
    };
  }());
  
  getValue();//0
  
  setValue(123);
  getValue();//123
        
  setValue(false);
  getValue();//123

Answer 1

getValue() and setValue() are closures, sharing a variable secret, so if the secret is changed in the setValue function, getValue() will of course read the secret Change accordingly.

Answer 2

Isn’t it 0? How did you get 123.