我写的为什么在火狐浏览器里不好用?求教代码如下:<script type="text/jscript">function subs(){
var time = document.fm.time.value;
if(time == ''){
alert("时间不能为空");
return false;
}
else{
return true;
}
}</script><form action="***" method="post" name="fm" onsubmit="return subs();"> <input type="text" name="time" /></form>
var time = document.fm.time.value;
if(time == ''){
alert("时间不能为空");
return false;
}
else{
return true;
}
}</script><form action="***" method="post" name="fm" onsubmit="return subs();"> <input type="text" name="time" /></form>
var time = document.getElementById('time').value;
if(time == ''){
alert("时间不能为空");
return false;
}
else{
return true;
}
}</script><form action="***" method="post" name="fm" onsubmit="return subs();"> <input type="text" name="time" id="time"/></form>
<script type="text/javascript">
var time = document.getElementById('time').value;//考虑到兼容性