js:时间显示器

currenttime:<input type="text" id="t">

<input type="button" value="start" onclick="start()">
<input type="button" value="stop" onclick="stop()">

var t;
function start(){

var date =new Date();

var year = date.getYear()+1900;
var month = date.getMonth()+1;
var day = date.getDate()
var hour = date.getHours()
var minute = date.getMinutes()
var second = date.getSeconds()

var inputObject = document.getElementById("t");
inputObject.value = hour+":"+minute+":"+second;
t = setTimeout("start()",1000);
}

function stop(){
clearTimeout(t);
}

 开始计时也可以:

function start1(){
            t=setInterval("start()", 1000);
            
        }