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<td onclick="aaa()">
<select id="select1" size="7" multiple>
<option value="供需发布">供需发布</option>
<option value="人才信息">人才信息</option>
<option value="养猪技术">养猪技术</option>
<option value="养猪培训">养猪培训</option>
<option value="养猪文化">养猪文化</option>
<option value="养猪资讯">养猪资讯</option>
<option value="猪场经营">猪场经营</option>
</select>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
function OnSelectChange(selecter){
alert(selecter.options[selecter.selectedIndex].value)
}
</script>
</HEAD>
<BODY>
<select id="select1" size="7" multiple onchange="OnSelectChange(this);">
<option value="供需发布">供需发布</option>
<option value="人才信息">人才信息</option>
<option value="养猪技术">养猪技术</option>
<option value="养猪培训">养猪培训</option>
<option value="养猪文化">养猪文化</option>
<option value="养猪资讯">养猪资讯</option>
<option value="猪场经营">猪场经营</option>
</select>
</BODY>
</HTML>
function aaa()
{
var obj=document.getElementById ('select1');
var str="";
for(var i=0;i<obj.size;i++)
{
if(obj[i].selected==true)
{
str=str+","+obj[i].value;
}
}
alert(str);
}
function aaa()
{
var obj=document.getElementById ('select1');
var str="";
for(var i=0;i<obj.size;i++)
{
if(obj[i].selected==true)
{
str=str+","+obj[i].value;
}
}
//alert(str);
}
<TITLE>b </TITLE>
<script>
function $(sId){
return document.getElementById(sId);
}
var arrSel = new Array();
function aaa(){
var oSel = $('select1');
for(var i=0;i<oSel.options.length;i++){
if(oSel.options[i].selected){
arrSel.push(oSel.options[i].text);
}
}
alert(arrSel.toString());
}
</script>
</HEAD>
<BODY>
<table border='1'>
<tr>
<td onclick="aaa()">
aaa
</td>
</tr>
</table>
<select id="select1" size="4" multiple>
<option value="111">111</option>
<option value="222">222</option>
<option value="333">333</option>
<option value="444">444</option>
</select>
</BODY>
</HTML>