시간 에 따라 마이크로 신호, js 전단 실현 방법

var wxNumber = ['   1','   2','   3','   4'];
var firstOpenTime = localStorage.getItem('firstOpenTime');          //       ，        


//            
var date = new Date();
Y = date.getFullYear() + '-';
M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1) : date.getMonth()+1) + '-';
D = date.getDate() + ' ';
h = date.getHours() + ':';
m = date.getMinutes() + ':';
s = date.getSeconds(); 
console.log(Y+M+D+h+m+s);


//   ：↓↓↓↓↓↓↓

// 1440                1440  
// 1440/15 = 96          96  

//          
//       

//      -               
//        / 15 =       


//     ：           
var zeroTime = Y+M+D+'00:00:00';       //        
var zeroTime_t = new Date(zeroTime.replace(/-/g, '/'));  //        
var zeroTime_timestamp = zeroTime_t.getTime();          //   Y+M+D+h+m+s           
console.log(' '+zeroTime_timestamp);


//                
// var nowTime = new Date();
var nowTime = new Date().getTime();
console.log(' '+nowTime);


//    ：            
var difference = nowTime - zeroTime_timestamp;
console.log(difference);

// 15       
var fift = 15*60*1000;
var count = Math.floor(difference/fift);    //        ，      
console.log(count);

//          
var wxNumber_count = wxNumber.length;
console.log(wxNumber_count);

//              
var wx_index = count % wxNumber_count;
console.log(wx_index);
console.log(wxNumber[wx_index]);





if(typeof(Storage)!==undefined && firstOpenTime==null){  // setp 1.           
                                                            //      ，      ‘firstOpenTime’  

    localStorage.setItem('firstOpenTime',wxNumber[wx_index]);    //                     
    $('.wxcopy').html(wxNumber[wx_index]);
    console.log('       ，    '+firstOpenTime);
    
}else if(typeof(Storage)!==undefined && firstOpenTime!=null){     // setp 2.           
                                                            //      ，      ‘firstOpenTime’   

    $('.wxcopy').html(firstOpenTime);
    console.log('       ,    +'+firstOpenTime);

}else {  // setp 3.    web storage   ，       
    console.log('sorry, you browser does not support Web storage...')
    $('.wxcopy').html(wxNumber[0]);
}