obj.options[obj.selectedIndex].text
<html>
<body>
<script type="text/javascript">
function a(object){
alert(object);
}
</script>
获取显示的值 -->
<select onchange="a(this.options[this.selectedIndex].innerText);">
<option value="value-a">text-a</option>
<option value="value-b">text-b</option>
</select><BR>
获取value的值 -->
<select onchange="a(this.options[this.selectedIndex].value);">
<option value="value-c">text-c</option>
<option value="value-d">text-d</option>
</select><BR>
<script type="text/javascript">
function isSelect(selectPress) {
//var select = document.getElementById("mySelect").ind;
var selectValue = selectPress.options[selectPress.selectedIndex].value; //显示value 下标0、1、2
var selectValue2 = selectPress.options[selectPress.selectedIndex].innerText; //显示显示的值 具体内容(上海、北京)
//alert(selectValue);
//alert(selectValue2);
if (selectValue == "-1") {
alert("请选择城市，表单提交被拒绝！")
return;
}
else {
document.getElementById('form1').submit(); //form表单提交
}
}
</script>
<select onchange="isSelect(this);" id="mySelect">
<option value="-1">--请选择--</option>
<option value="0">北京</option>
<option value="1">上海</option>
<option value="2">武汉</option>
</select>
</body>
</html>