怎么使用JavaScript实现时间动态显示，而且搜索输入框是否为空值验证？
3个回答
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<input type="text" id="a" value="">js里：var b = document.getElementById('a'); if(b= =null&&b==" "){alert("不能为空");}动态时间，我感觉没必要因为大多人直接看电脑右下的时间，不过你要就给你<script language="JavaScript">
<!--
function Time(){
if (!document.layers&&!document.all)
return
var Timer=new Date()
var hours=Timer.getHours()
var minutes=Timer.getMinutes()
var seconds=Timer.getSeconds()
var noon="AM"
if (hours>12){
noon="PM"
hours=hours-12
}
if (hours==0)
hours=12
if (minutes<=9)
minutes="0"+minutes
if (seconds<=9)
seconds="0"+seconds
//change font size here to your desire
myclock="<font size='4' face='Arial' color=blue>"+hours+":"+minutes+":"
+seconds+" "+noon+"</b></font>"
if (document.layers){
document.layers.position.document.write(myclock)
document.layers.position.document.close()
}
else if (document.all)
position.innerHTML=myclock
setTimeout("Time()",1000)
}
//-->
</script>
<span id="position" style="position:absolute;left:441px;top:190px; width: 128px; height: 30px">
</span>
<!--
function Time(){
if (!document.layers&&!document.all)
return
var Timer=new Date()
var hours=Timer.getHours()
var minutes=Timer.getMinutes()
var seconds=Timer.getSeconds()
var noon="AM"
if (hours>12){
noon="PM"
hours=hours-12
}
if (hours==0)
hours=12
if (minutes<=9)
minutes="0"+minutes
if (seconds<=9)
seconds="0"+seconds
//change font size here to your desire
myclock="<font size='4' face='Arial' color=blue>"+hours+":"+minutes+":"
+seconds+" "+noon+"</b></font>"
if (document.layers){
document.layers.position.document.write(myclock)
document.layers.position.document.close()
}
else if (document.all)
position.innerHTML=myclock
setTimeout("Time()",1000)
}
//-->
</script>
<span id="position" style="position:absolute;left:441px;top:190px; width: 128px; height: 30px">
</span>
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<script language="javascript">
function showtime(){
var now=new Date();
var year=now.getFullYear();
var month=now.getMonth();
var date=now.getDate();
var day=now.getDay();
var hour=now.getHours()
var minu=now.getMinutes()
var sec=now.getSeconds()
var week;
month+=1;
if(month<10)month="0"+month;
if(date<10)date="0"+date;
if(hour<10)hour="0"+hour;
if(hour>12){
hour="下午"+(hour-12);
}else{
hour="上午"+hour;
}
if(minu<10)minu="0"+minu;
if(sec<10)sec="0"+sec;
switch(day){
case 1:
week="星期一";
break;
case 2:
week="星期二";
break;
case 3:
week="星期三";
break;
case 4:
week="星期四";
break;
case 5:
week="星期五";
break;
case 6:
week="星期六";
break;
default:
week="星期日";
break;
}
var time="";
document.getElementById("time").innerHTML=year+"年"+month+"月"+date+"日"+week+" "+hour+":"+minu+":"+sec;
setTimeout("showtime()",1000);
}function sou(){var sou_x=document.getElementById("sou").value;if(sou_x==""){
alert("空"); }
</script>
<body onload="showtime()">
<div id="time" name="time"></div><form><input type="text" id="sou" name="sou" /></rorm>
</body>
function showtime(){
var now=new Date();
var year=now.getFullYear();
var month=now.getMonth();
var date=now.getDate();
var day=now.getDay();
var hour=now.getHours()
var minu=now.getMinutes()
var sec=now.getSeconds()
var week;
month+=1;
if(month<10)month="0"+month;
if(date<10)date="0"+date;
if(hour<10)hour="0"+hour;
if(hour>12){
hour="下午"+(hour-12);
}else{
hour="上午"+hour;
}
if(minu<10)minu="0"+minu;
if(sec<10)sec="0"+sec;
switch(day){
case 1:
week="星期一";
break;
case 2:
week="星期二";
break;
case 3:
week="星期三";
break;
case 4:
week="星期四";
break;
case 5:
week="星期五";
break;
case 6:
week="星期六";
break;
default:
week="星期日";
break;
}
var time="";
document.getElementById("time").innerHTML=year+"年"+month+"月"+date+"日"+week+" "+hour+":"+minu+":"+sec;
setTimeout("showtime()",1000);
}function sou(){var sou_x=document.getElementById("sou").value;if(sou_x==""){
alert("空"); }
</script>
<body onload="showtime()">
<div id="time" name="time"></div><form><input type="text" id="sou" name="sou" /></rorm>
</body>
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var enable=0;today=new Date();
var day;
var date;
var time_start=new Date();
var clock_start=time_start.getTime();
if (today.getDay()==0) day="日";
if (today.getDay()==1) day="一";
if (today.getDay()==2) day="二";
if (today.getDay()==3) day="三";
if (today.getDay()==4) day="四";
if (today.getDay()==5) day="五";
if (today.getDay()==6) day="六";
date=""+(today.getYear())+"年"+(today.getMonth()+1)+"月"+(today.getDate())+"日 星期";
document.write("<span style='font-size:9pt;text-align:center'>"+date);
document.write(day+"</span>");
var day;
var date;
var time_start=new Date();
var clock_start=time_start.getTime();
if (today.getDay()==0) day="日";
if (today.getDay()==1) day="一";
if (today.getDay()==2) day="二";
if (today.getDay()==3) day="三";
if (today.getDay()==4) day="四";
if (today.getDay()==5) day="五";
if (today.getDay()==6) day="六";
date=""+(today.getYear())+"年"+(today.getMonth()+1)+"月"+(today.getDate())+"日 星期";
document.write("<span style='font-size:9pt;text-align:center'>"+date);
document.write(day+"</span>");
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