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您需要将内容放在选择标签内的选项标签中。
"<option>"+xmlhttp.responseText+"</option">;
或在 php 中：
$d = "<option>".$_GET['q']."</option">;
响应文本不是传入 onreadystatechange 回调吗？
xmlhttp.onreadystatechange = function (response){ // insert your method body here }