为什么把(放在这个位置打印出来的结果是错误的

var today=new Date();

var a=today.getFullYear();

var b=today.getMonth();

var c=today.getDate();

var d=today.getHours();

var e=today.getTime();

var f=today.getDay();

today.setDate(today.getDate()+10);

console.log(today);

console.log(f);