<select id="sel">
<option value="aaa">aaa
<option value="bbb">bbb
<option value="ccc">ccc
<option value="ddd">ddd
</select><input type="button" onclick="test();" value="test">
<script>
function test(){
var s = document.getElementById("sel");
var o = s.options;
for(var i=0;i<o.length;i++){
if(o[i].value == "ccc")
o[i].selected = true;
}
}
</script>
<option value="aaa">aaa
<option value="bbb">bbb
<option value="ccc">ccc
<option value="ddd">ddd
</select><input type="button" onclick="test();" value="test">
<script>
function test(){
var s = document.getElementById("sel");
var o = s.options;
for(var i=0;i<o.length;i++){
if(o[i].value == "ccc")
o[i].selected = true;
}
}
</script>
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