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function move() {
var sel = document.getElementById("List");
if (sel.options.length > 0 && sel.selectedIndex != -1) {
var node = sel.options[sel.selectedIndex];
var nextNode;
if (sel.selectedIndex == 0)
nextNode = null;
else
nextNode = sel.options[sel.selectedIndex - 1];
if (nextNode) node.swapNode(nextNode); //移动
}
}
<select size="2" style="height: 203px; width: 309px" id="List" multiple="multiple">
<option>a</option>
<option>b</option>
</select>
<input type="button" value="up" onclick="move()">