js实时显示时间(自动变化)代码

html代码：

<div id="currentTime"></div>

js代码(简单版)：

setInterval(function(){
    document.getElementById("currentTime").innerHTML=new Date().toLocaleString();
},1000); 

js代码(高级版)：高级版实现了时间补全与星期显示。

setInterval(function () {
    fnDate();
}, 1000);

//js 获取当前时间
function fnDate() {
    var oDiv = document.getElementById("currentTime");
    var date = new Date();
    var year = date.getFullYear();
    var month = date.getMonth();
    var data = date.getDate();
    var hours = date.getHours();
    var minute = date.getMinutes();
    var second = date.getSeconds();
    var time = year + "-" + fnW((month + 1)) + "-" + fnW(data) + " " + fnW(hours) + ":" + fnW(minute) + ":" + fnW(second);
    var a = new Array("日", "一", "二", "三", "四", "五", "六");
    var week = new Date().getDay();
    var str = "星期" + a[week];
    oDiv.innerHTML = time + "　" + str;
}
//补位 当某个字段不是两位数时补0
function fnW(str){return str > 9 ? str : "0"+str;}