function U (){ this.time = null; this.totalTime = 0; this.console = function(text){ if(this.time>=0){ this.totalTime += this.time; setTimeout(()=>{ console.log(text) },this.totalTime) }else{ console.log(text) } return this } this.settimeout = function(time){ this.time = time || 0; return this } } let u = new U(); u.console("hello").settimeout(3000).console("world").settimeout(3000).console()