oop - Access instance variable inside a function in javascript? -

how can in easiest way access instance variable inside function?

function myobject(){       //instance variables      this.handler;       //methods      this.enablehandler = function(){          var button = document.getelementbyid('button');          button.onclick = function(){              this.handler();//is not working          }      }  } var myobject = new myobject(); myobject.handler = function(){     alert('hello world!'); } myobject.enablehandler(); 

note can set button.onclick = this.handler;. example. main question how can access this.handler inside function?

i can define new variable var handler = this.handlerto access this.handler. if change handlerwill this.handler changes?

function myobject(){       //instance variables      this.handler;      var = this;  //notice change      //methods      this.enablehandler = function(){          var button = document.getelementbyid('button');          button.onclick = function(){              that.handler();//is not working  notice change          }      }  } var myobject = new myobject(); myobject.handler = function(){     alert('hello world!'); } myobject.enablehandler(); 

if assign var within scope of outer function, passed inner functions scope chain. within inner function referencing refers inner function, referencing variable assigned this, in our case "that", refers object.