既能实现下拉又能实现输入的文本框
<div style="position:relative;"> <span style="margin-left:100px;width:18px;overflow:hidden;"> <select style="width:118px;margin-left:-100px" onchange="this.parentNode.nextSibling.value=this.value"> <option value="Ajax">Ajax</option> <option value="XML">XML</option> <option value="xmlHTTP">xmlHTTP</option> <option value="CSS">CSS</option> </select></span><input name="tag" style="width:100px;position:absolute;left:0px;height:21px;" value="输入或选择" > </div>
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