function Ninja(){
    var feints = 0;
    this.getFeints = function(){
        return feints;
    };
    this.feint = function() {
        feintsPP;
    };
}
var ninja1 = new Ninja();
ninja1.feint();
console.log(ninja1.feints);
console.log(ninja1.getFeints());
    

/ / undefined
/ / 1
I would like to ask how the closure here can get the value of the accumulated feints through ninja1.getFeints (), but not directly through ninja1.feints?

can it be understood that ninja1.feints cannot be accessed because feints is inside the constructor, but by calling the method ninja1.feint (), feints exists in the closure, so it can be returned through getFeints ()?