如何用js动态显示本地时间？

答案：<html xmlns=" http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
    <script type="text/javascript" language="javascript">
        function disptime(){
            var mt = new Date();
            var hour = mt.getHours();
            var minute = mt.getMinutes();
            var second = mt.getSeconds();
            
            document.frm.mytime.value=hour + ":" + minute + ":" + second;
            
            setTimeout("disptime()",1000);
        }
        
    </script>
</head>
<body onload="disptime()">
    <form action="" method="post" name="frm">
        <input type="text" name="mytime" />
    </form>
</body>
</html>
<script>
document.write(new Date());
</script>
<html>

<head>
<script type="text/javascript">
var serverTime="2010/08/03 17:59:54";
var lastTime=Date.parse(serverTime);
var showTime=function(){
lastTime=lastTime+1000;
var str=new Date(lastTime).format("yyyy-MM-dd hh:mm:ss");
document.getElementById("showTimeLabel").value=str;
var hour=new Date(lastTime).getHours();
if(hour>17){
document.getElementById("textbt").disabled="disabled";
}
}
var stl=setInterval("showTime()",1000);
Date.prototype.format=function(fmt) {       
var o = {       
"M+" : this.getMonth()+1, //月份       
"d+" : this.getDate(), //日       
"h+" : this.getHours()%12 == 0 ? 12 : this.getHours()%12, //小时       
"H+" : this.getHours(), //小时       
"m+" : this.getMinutes(), //分       
"s+" : this.getSeconds(), //秒       
"q+" : Math.floor((this.getMonth()+3)/3), //季度       
"S" : this.getMilliseconds() //毫秒       
};       
var week = {       
"0" : "\u65e5",       
"1" : "\u4e00",       
"2" : "\u4e8c",       
"3" : "\u4e09",       
"4" : "\u56db",       
"5" : "\u4e94",       
"6" : "\u516d"      
};       
if(/(y+)/.test(fmt)){       
fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));       
}       
if(/(E+)/.test(fmt)){       
fmt=fmt.replace(RegExp.$1, ((RegExp.$1.length>1) ? (RegExp.$1.length>2 ? "\u661f\u671f" : "\u5468") : "")+week[this.getDay()+""]);       
}       
for(var k in o){       
if(new RegExp("("+ k +")").test(fmt)){       
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));       
}       
}       
return fmt;       
}      
</script>
</head>

<body onload="showTime()">

<input id="showTimeLabel" value="">
<input id="textbt" type="button" value="text">

</body>

</html>
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