关于JavaScirpt，小弟我有疑问，请您帮助
日期：2014-05-16 浏览次数：20588 次
关于JavaScirpt，我有疑问，请您帮助。
最近小弟我出学JS在调程序时遇到了麻烦，请各位前辈专家指点。
以下是有问题的程序：
<html >
<head>
<title> Date对象 </title>
<script language= "javascript ">
function disptime()
{
var now=new Date();
var hour=now.getHours();
var mins=now.getMinutes();
var sed=now.getSeconds();
if(hour> 0&&hour <=12)
document.write( "上午好！ ");
if(hour> 12&&hour <=18)
document.write( "下午好！ ");
if(hour> 18 && hour <24)
document.write( "晚上好！ ");
document.myform.myclock.value= "现在时间： "+hour+ ": "+mins+ ": "+sed+ " ";
var myTime=setTimeout( "disptime() ",1000);
}
</script>
</head>
<body onload= "disptime() ">
<form name= "myform ">
<div align= "center ">
<input type= "text " name= "myclock " value= " " >
</div>
</form>
</body>
</html>
编译器回应说document.myform.myclock.value对象为空，为什么呢？
请您指点，谢谢，谢谢！
------解决方案--------------------
<html >
<head>
<title> Date对象 </title>
<script language= "javascript ">
function disptime()
{
var now=new Date();
var hour=now.getHours();
var mins=now.getMinutes();
var sed=now.getSeconds();
if(hour> 0&&hour <=12)
document.myform.t1.value= "上午好！ ";
else if(hour> 12&&hour <=18)
document.myform.t1.value= "下午好！ ";
else if(hour> 18 && hour <=24)
document.myform.t1.value= "晚上好！ ";
document.myform.myclock.value= "现在时间： "+(hour> =10? " ": "0 ")+hour+(mins> =10? ": ": ":0 ")+mins+(sed> =10? ": ": ":0 ")+sed+ " ";
setTimeout( "disptime() ",1000);
}
</script>
</head>
<body onload= "disptime() ">
<form name= "myform ">
<div align= "center ">
<input type= "text " name= "t1 " value= " " >
<input type= "text " name= "myclock " value= " " >
</div>
</form>
</body>
</html>
最近小弟我出学JS在调程序时遇到了麻烦，请各位前辈专家指点。
以下是有问题的程序：
<html >
<head>
<title> Date对象 </title>
<script language= "javascript ">
function disptime()
{
var now=new Date();
var hour=now.getHours();
var mins=now.getMinutes();
var sed=now.getSeconds();
if(hour> 0&&hour <=12)
document.write( "上午好！ ");
if(hour> 12&&hour <=18)
document.write( "下午好！ ");
if(hour> 18 && hour <24)
document.write( "晚上好！ ");
document.myform.myclock.value= "现在时间： "+hour+ ": "+mins+ ": "+sed+ " ";
var myTime=setTimeout( "disptime() ",1000);
}
</script>
</head>
<body onload= "disptime() ">
<form name= "myform ">
<div align= "center ">
<input type= "text " name= "myclock " value= " " >
</div>
</form>
</body>
</html>
编译器回应说document.myform.myclock.value对象为空，为什么呢？
请您指点，谢谢，谢谢！
------解决方案--------------------
<html >
<head>
<title> Date对象 </title>
<script language= "javascript ">
function disptime()
{
var now=new Date();
var hour=now.getHours();
var mins=now.getMinutes();
var sed=now.getSeconds();
if(hour> 0&&hour <=12)
document.myform.t1.value= "上午好！ ";
else if(hour> 12&&hour <=18)
document.myform.t1.value= "下午好！ ";
else if(hour> 18 && hour <=24)
document.myform.t1.value= "晚上好！ ";
document.myform.myclock.value= "现在时间： "+(hour> =10? " ": "0 ")+hour+(mins> =10? ": ": ":0 ")+mins+(sed> =10? ": ": ":0 ")+sed+ " ";
setTimeout( "disptime() ",1000);
}
</script>
</head>
<body onload= "disptime() ">
<form name= "myform ">
<div align= "center ">
<input type= "text " name= "t1 " value= " " >
<input type= "text " name= "myclock " value= " " >
</div>
</form>
</body>
</html>
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