Ionic 2 : Set interval

this.task = setInterval(() => {
  this.refreshData();
}, 300);

or store context like this

let self = this;
this.task = setInterval(function () {
  self.refreshData();
}, 300);

or using bind

this.task = setInterval((function () {
  this.refreshData();
}).bind(this), 300);

if only one function call:

this.task = setInterval(this.refreshData.bind(this), 300);

you could learn more about this with https://github.com/getify/You-Dont-Know-JS/tree/1st-ed/this%20%26%20object%20prototypes/ch1.md

You should use setInterval() with => arrow, as I mentioned below

   setInterval(() => {      
          console.log('timer');
          //you can call function here
    },5000);

100% working.

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