IEFI bind context [дубликат]

var a = { 
  property1: "test", 
  method1: function() { 
    (function(par1, par2, par3) { 
      console.log(this.property1); 
    }).bind(this)(1, 2, 3); 
  } 
}; 
 
a.method1();

var a = { 
  property1: "test", 
  method1: function() { 
    ((par1, par2, par3) => { 
      console.log(this.property1); 
    })(1, 2, 3); 
  } 
}; 
 
a.method1();