太奇怪了！！！快点帮帮我!

[iamwaiting1980]

<form name="test">
<input type="text" size="10" value="good" name="boxes">
</form>
<input type="button" value="Click Here" onClick="return alarm();">

<script language="javascript" type="text/javascript">
function alarm(){
//if( document.test.boxes.value=="" ){
alert(document.test.boxes.value);
user_name_alarm.innerText="";
//}
}
</script>

可以谈出提示

<form name="test">
<input type="text" size="10" value="good" name="boxes">
</form>
<input type="button" value="Click Here" onClick="return alarm();">

<script language="javascript" type="text/javascript">
function alarm(){
if( document.test.boxes.value=="" ){
alert(document.test.boxes.value);
user_name_alarm.innerText="";
}
}
</script>
不可以探出提示，怎么回事？？

[blues-star]

if( document.test.boxes.value=="" ){

因为你判断了只有为空才提示

[shyslysky]

把<input type="text" size="10" value="good" name="boxes">改为
<input type="text" size="10" value="" name="boxes">
看看

[sdts]

第一个注释掉条件了 当然弹出来了

onClick="return alarm();"改成onClick="alarm()"
document.test.boxes.value=="" 改成document.all.boxes.value==""

[iamwaiting1980]

<div id="user_name_alarm"></div>

<form name="test">
<input type="text" size="10" value="good" name="boxes">
</form>
<input type="button" value="Click Here" onClick="return alarm();">

<script language="javascript" type="text/javascript">
function alarm(){
if( document.test.boxes.value=="" ){
user_name_alarm.innerText="";
}
}
</script>

div里边并不会谈出提示

[iamwaiting1980]

确定了，如下：
<div id="user_name_alarm"></div>

<form name="test">
<input type="text" size="10" name="boxes">
</form>
<input type="button" value="Click Here" onClick="alarm()">

<script language="javascript" type="text/javascript">
function alarm(){
if( document.all.test.boxes.value=="" ){
user_name_alarm.innerText="值不能为空!";
}
}
</script>

语法完全正确，是 我的ie的问题，我的是5.0