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()