火狐浏览器-利用Greasemonkey给页面显示本地时间

$("body").append("<div id=‘addMyTime‘ style=‘font-size:25px; padding:5px; background-color:#ccc; color:#fff; position:fixed; top:100px; left:20px;‘>"+getTime()+"</div>");

function getTime(){
  var now = new Date();
  var hh = now.getHours();
  var mi = now.getMinutes();
  var ss = now.getSeconds();

  if(hh >= 0 && hh <= 9){hh = "0" + hh;}
  if(mi >= 0 && mi <= 9){mi = "0" + mi;}
  if(ss >= 0 && ss <= 9){ss = "0" + ss;}
  
  return hh+":"+mi+":"+ss;
}

var tt = setInterval(function(){
  $("#addMyTime").text(getTime());
},450);

function getNowFormatDate() {
    var date = new Date();
    var seperator1 = "-";
    var seperator2 = ":";
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    if (month >= 1 && month <= 9) {
        month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
            + " " + date.getHours() + seperator2 + date.getMinutes()
            + seperator2 + date.getSeconds();
    return currentdate;
}