formatDate 格式化日期 ,给小于10的月日，加0，如01 02 03

var months=["Jan", "Feb", "Mar", "Apr", "May", "Jun","Jul", "Aug","Sep","Oct", "Nov", "Dec"];
function formatDate(time){
    if(!time){
        return "";
    }

    if(typeof time=='number'){
        var d=new Date(time);
        var dStr = "";
        var mStr = "";
        if(d.getDate()<10){
            dStr = "0"+d.getDate();
        }else{
            dStr = d.getDate();
        }
        if(d.getMonth()<9){ //month should +1
            mStr = "0" + (d.getMonth()+1);
        }else{
            mStr = (d.getMonth()+1);
        }
        return d.getFullYear()+'-'+mStr+'-'+dStr;
    }
    else{

        return time;
    }
}