<script>
function checkSel()
{
if (sel1.value > sel2.value) alert("列表1="+sel1.value+" > 列表2="+sel2.value);
}
</script>
<select name="sel1">
<option value="1">1</option>
<option value="3">3</option>
<option value="5">5</option>
</select>
<select name="sel2">
<option value="2">2</option>
<option value="4">4</option>
<option value="6">6</option>
</select>
<input type="button" value="提交" onclick="checkSel()">
function checkSel()
{
if (sel1.value > sel2.value) alert("列表1="+sel1.value+" > 列表2="+sel2.value);
}
</script>
<select name="sel1">
<option value="1">1</option>
<option value="3">3</option>
<option value="5">5</option>
</select>
<select name="sel2">
<option value="2">2</option>
<option value="4">4</option>
<option value="6">6</option>
</select>
<input type="button" value="提交" onclick="checkSel()">
function check()
{
if(f1.d1.value>f1.d2.value)alert("right")
else{alert("error")}
}
</script>
</head><body><form name=f1 method="POST" action="">
<p><select size="1" name="d1">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
<option value=4>4</option>
<option value=5>5</option>
</select><select size="1" name="d2">
<option value=2>2</option>
<option value=3>3</option>
<option value=4>4</option>
<option value=5>6</option>
<option value=6>7</option>
<option value=99>99</option>
</select><input type="button" value="按钮" name="B1" onclick="check()"></p>
</form></body></html>