Make Object in javscript with jquery : I get some trouble in jquery.

I want to make object in javascript(like class but it is not support for es5/6 on my browser).My goal is get this of function in callback of Jquery.

Show off my Code.

    var log = e => console.log(e);

    $(function(){
        var oop = new _oop();
    })

    var _oop = function(){
      this.testVariable = 0;
      $.get(url,function(){
        log(this.testVariable);//undefined
      });
    }
That Variable is point at selector by jquery,I could not thought another ideas,just use "var" instead of "this" could deal this.
