SOURCE

function mySetInterVal(fn,a,b){
    this.a=a;
    this.b=b;
    this.time=0;
    this.handle=-1;
    this.start=()=>{
        this.handle=setTimeout(()=>{
            fn();
            this.time++;
            this.start();
            console.log(this.a+this.time*this.b);
        },this.a+this.time*this.b)
    }

    this.stop=()=>{
        clearTimeout(this.handle);
        this.time=0;
    }
}

var a =new mySetInterVal(()=>{
    console.log('123')
},1000,2000);
a.start();
a.stop();