JS中的建構函式

<script language="JavaScript">
            window.onload = function(){
                function Bottle(name,price,isInsulation){
                    this.name = name;
                    this.price = price;
                    this.isInsulation = isInsulation;
                    
                    
 
//方法
                    this.sayHello = function(){
                        console.log('hello');
                    }
                }
                
                //new 關鍵字會預設建立一個物件然後將引數中的值賦值給這個物件最後給bottle
                var bottle = new Bottle('保溫杯',49,true);
                console.log(bottle);
                console.log(
 
'bottle是Bottle的例項嗎？',bottle instanceof Bottle);
                //呼叫物件中的方法
                bottle.sayHello();
                
            };
        </script>