简单的一个问题....

[laers]

js还很菜,还需学习学习..
请教大家0一下简单的问题.谢谢了.

点击加号,文本框就加1,点击减号就减1.文本框为空时赋0值.


<form name="form1" method="post" action="">
<input type="submit" name="Submit" value="+">
<input type="submit" name="Submit2" value="-">
<input name="te" type="text" id="te" size="10">
</form>

[xiaobird1]

<form name="form1" method="post" action="">
<input type="button" name="Submit" value="+" onclick="form1.te.value++;">
<input type="button" name="Submit2" value="-" onclick="form1.te.value--;">
<input name="te" type="text" id="te" size="10">
</form>

[maxid]

<form name="form1" method="post" action="">
<input type="button" name="button1" value="+" onclick="form1.te.value++;">
<input type="button" name="button2" value="-" onclick="form1.te.value--;">
<input name="te" type="text" id="te" size="10" onclick="form1.te.value++;">
</form>

[nolonely]

<script language="JavaScript">
<!--
function a(o,n){
o.value=isNaN(o.value)?0:(Number(o.value)+n)
}
//-->
</script>
<form name="form1" method="post" action="">
<input type="button" name="Submit" value="+" onclick="a(te,1)">
<input type="button" name="Submit2" value="-" onclick="a(te,-1)">
<input name="te" type="text" id="te" size="10">
</form>