获取系统时间

var month=new Date().getMonth()+1;//当前月份
var data=new Date().getDate();//天
var day=new Date().getDay();
var a=["日", "一", "二", "三", "四", "五", "六"];
var week = new Date().getDay();
var d=month+"月"+data+"日"+"星期"+ a[week];
var date=document.getElementById("date");
date.innerHTML=d;

var clock=document.getElementById("clock");
var t;
var inter=setInterval(function() {
    var hours=new Date().getHours();//小时
    if(hours<10){hours="0"+hours};
    var minute=new Date().getMinutes();//分
    if(minute<10){minute="0"+minute};
    var second=new Date().getSeconds();//秒
    if(second<10){second="0"+second};
    t =hours+":"+minute+":"+second;
    console.log(t);
    clock.innerHTML=t;
}, 1000);