Use JavaScript to display the number of days until the Mid-Autumn Festival on the page

nbsp;html>
    <meta>
    <title>在页面中显示距离2017年中秋节的天数</title>
    <script>
        function countdown(title,Intime,pId) {            var online=new Date(Intime);  //根据参数定义时间对象            var now=new Date();     //定义当前系统时间            var leave=online.getTime()-now.getTime(); //计算时间差            var day=Math.floor(leave/(1000*60*60*24))+1;            if (day>1){
                    pId.innerHTML="<b>----距离"+title+"还有"+day+"天！<br/>" ; //页面显示信息            }else{                if (day==1){
                        pId.innerHTML="<b>----明天就是"+title+"啦！<br/>" ; //页面显示信息                }else{                    if (day==0) {
                        pId.innerHTML = "<b>----今天就是" + title + "呀！<br/>"; //页面显示信息                    }else{
                            pId.innerHTML="<b>----哎呀!"+title+"已经过了！<br/>" ; //页面显示信息                        }
                    }
                }
        }    </script>
    

                                   

                                                                                                                             

---                                 <script> countdown("2017年中秋节","10/4/2017",countDown); //调用JavaScript函数 </script>

            

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