[クイズ]javascriptと仲良くなるための一歩 第４４話「this参照３」

問題

var obj = {
           x:3,
           doit: function(){ console.log("method is called." + this.x); }
          }
var fn = obj.doit;

var obj2 = {
            x:4,
            doit2:fn
           }
obj2.doit2(); //=> ?

答え

var obj = {
           x:3,
           doit: function(){ console.log("method is called." + this.x); }
          }
var fn = obj.doit;

var obj2 = {
            x:4,
            doit2:fn
           }
obj2.doit2(); //=> method is called.4