function clock(){
var date=new Date();
var hours=date.getHours();
var minus=date.getMinutes();
var second=date.getSeconds();
var str=hours+":"+minus+":"+second;
var clock=document.getElementById("clock");
clock.innerText="注册时间:"+str;
window.setTimeout("clock()",1000);//注意方法引用时的引号
}
</script>
<title>用户注册界面</title>
</head>
<body onload="clock()">
<div id="clock"></div>
</body>