var stringToDate = function(dateStr,separator){     if(!separator){         separator="-";     }     var dateArr = dateStr.split(separator);     var year = parseInt(dateArr[0]);     var month;     //处理月份为04这样的情况                              if(dateArr[1].indexOf("0") == 0){         month = parseInt(dateArr[1].substring(1));     }else{          month = parseInt(dateArr[1]);     }     var day = parseInt(dateArr[2]);     var date = new Date(year,month -1,day);     return date; } 

var dateFeedBack = stringToDate(gfeedbackDataStore.getRowSet().getRow(0).getItemValue("svfd_FEEBBACK_DATE"));    var dateNow = stringToDate(callback_date);    var days1 = parseInt(dateFeedBack.getTime()/(1000*60*60*24));    var days2 = parseInt(dateNow.getTime()/(1000*60*60*24));    if((days2-days1)>7){      alert("提示：总部确认日期7天内才可退单！");      return;    }