如何获取select下拉框的值：

1.下拉框的option没有value属性时

复制代码 代码如下:

<select id="param1">

<option>学号</option>

<option>姓名</option>

<option>年龄</option>

</seclect>

<script>

window.onload = funciton(){

var param = document.getElementById("param1");

param.onchange = getParam(){

var text = param.value;

}

}

</script>

2.下拉框的option有value属性时

复制代码 代码如下:

<select id="param1">

<option>学号</option>

<option>姓名</option>

<option>年龄</option>

</seclect>

<script>

window.onload = funciton(){

var param = document.getElementById("param1");

param.onchange = getParam(){

var selectIndex = param.selectIndex; //获得被选项的引索号

var text = param.options[selectIndex].text;

</script>