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select选中事件

<!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>无标题页</title>    <script type="text/javascript">    function showMessage()    {        if(document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value==1)        {            alert("你好,你选择了第 1 个");            document.getElementById("divMessage").innerText=document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value;        }        else if(document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value==2)        {            alert("你好,你选择了第 2 个");            document.getElementById("divMessage").innerText=document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value;        }        else if(document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value==3)        {            alert("你好,你选择了第 3 个");            document.getElementById("divMessage").innerText=document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value;        }        else if(document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value==4)        {            alert("你好,你选择了第 4 个");            document.getElementById("divMessage").innerText=document.getElementById("selectID").options[document.getElementById("selectID").selectedIndex].value;        }    }    </script><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /></head><body><select id="selectID" onchange="return showMessage()">    <option value="0">-----请选择----</option>    <option value="1">1</option>    <option value="2">2</option>    <option value="3">3</option>    <option value="4">4</option></select>    <div id="divMessage"></div></body></html>

 

无标题页

<script type="text/javascript">// </script>