if(!Function.prototype.bind2) {

  Function.prototype.bind2 = function(obj) {

    var fun = this;

    return function() {

      fun.apply(obj, arguments);

    };

  };  

}

​

function displayName(lastName) {

  console.log(this.name + " " + lastName);

}

​

var obj1 = {name: "Deepak"};

var obj2 = {name: "Chetan"};

​

var displayName = displayName.bind2(obj1);

​

displayName("Sisodiya");

displayName.call(obj2, "Sisodiya");