function substrDate(str){
 return str.substring(0,10)
}
function substrText(str,start,end){
  return str.substring(start,end)
 }
 function numRate(value){
    var result=(value==''?'0%':(value*100).toFixed(0)+"%");
  return result
 }

function indexOf(arr, value) {
  if (arr.indexOf(value) < 0) {
      return false;
  } else {
      return true;
  }
} 
function  learnTime(value){
     if(value==''){
       return '';
     }else{
      var hour=Math.floor(value/3600);
      var minute=Math.floor((value-hour*3600)/60);
      var second=value%60;
      // return hour+'小时'+minute+'分钟'+second+'秒';
      return hour+'小时'+minute+'分钟';
     }
 
}
function  learnTimeHour(value){
  var hour=Math.floor(value/3600);
  var minute=Math.floor((value-hour*3600)/60);
  var second=value%60;
 
  return hour;
}
function  learnTimeMinute(value){
  var hour=Math.floor(value/3600);
  var minute=Math.floor((value-hour*3600)/60);
  var second=value%60;
 
  return minute;
}

module.exports = {
 substrDate: substrDate,
 indexOf:indexOf ,
 substrText:substrText,
 numRate:numRate,
 learnTime:learnTime,
 learnTimeHour:learnTimeHour,
 learnTimeMinute:learnTimeMinute
}