var today = new Date();     

var day   = today.getDate();                       

var month = today.getMonth() + 1;     

var year  = today.getYear();     

var hours = today.getHours();     

var minute = today.getMinutes();  

//获取昨天的日期  

var zt = new Date(today.getFullYear(),today.getMonth(),today.getDate()-1);         

var ztb = new Date(today.getFullYear(),today.getMonth(),today.getDate());         

month = month<10?"0"+month:month;//如果小于10即显示为09月       

day = day<10?"0"+day:day;//如果小于10即显示为09日         

var zt_Month = zt.getMonth()*1+1;  

var zt_date = zt.getDate();  

zt_Month = zt_Month<10?"0"+zt_Month:zt_Month;  

zt_date = zt_date<10?"0"+zt_date:zt_date;