document.getElementById('txtResion').options[document.getElementById('txtResion').selectedIndex].innerHTML;
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="Gao YiXiang" />
<meta name="email" content="[email protected]" />
<meta name="keywords" content="javascript dhtml dom" />
<meta name="description" content="I love web development." />
</head>
<body>
<select id="txtStudent" onchange="alert(this.options[this.selectedIndex].innerText)">
<option value="">Please select</option>
<option value="cf01da04-ac7b-477a-96ff-072f35b83345"> 爱情 </option>
<option value="578d3701-90fe-4019-a51e-41783f7dc570"> dswefwe </option>
<option value="7c3896df-96ab-4cd4-a5b7-c24026b327a9"> 白白12 </option>
<option value="c0661499-7dae-4ab2-9b8b-689e87e3b839"> sdvwewd </option>
<option value="4eb1c8a2-416f-4dd9-9449-e6ce170bc1a6"> wefwef </option>
<option value="50466f69-dba6-4d5e-8c56-79927258b9aa"> wefewf </option>
<option value="77e664d7-221e-485c-84a8-d20867029d08"> qwdqwd </option>
<option value="b5386616-5c3c-44ef-a9ec-66a89f4da255"> sdfwef </option>
</select>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="Gao YiXiang" />
<meta name="email" content="[email protected]" />
<meta name="keywords" content="javascript dhtml dom" />
<meta name="description" content="I love web development." />
</head>
<body>
<select id="txtStudent">
<option value="">Please select</option>
<option value="cf01da04-ac7b-477a-96ff-072f35b83345"> 爱情 </option>
<option value="578d3701-90fe-4019-a51e-41783f7dc570"> dswefwe </option>
<option value="7c3896df-96ab-4cd4-a5b7-c24026b327a9"> 白白12 </option>
<option value="c0661499-7dae-4ab2-9b8b-689e87e3b839"> sdvwewd </option>
<option value="4eb1c8a2-416f-4dd9-9449-e6ce170bc1a6"> wefwef </option>
<option value="50466f69-dba6-4d5e-8c56-79927258b9aa"> wefewf </option>
<option value="77e664d7-221e-485c-84a8-d20867029d08"> qwdqwd </option>
<option value="b5386616-5c3c-44ef-a9ec-66a89f4da255"> sdfwef </option>
</select>
<script type="text/javascript">
<!--
var oSlt = document.getElementById("txtStudent");
// 适用于单选,多选时自己改改!
oSlt.getSelectedText = function()
{
return this.options[this.selectedIndex].text;
};
oSlt.onchange = function()
{
alert(this.getSelectedText());
};
//-->
</script>
</body>
</html>