<select name="selectmenu" style="position:absolute;top:0px; width: 110px; height: 0px; left: 0px; clip: rect(0 180 110 60) " onChange="document.getElementById('dmtxt').value=this.options[this.selectedIndex].value"> <option value="">选择邮箱</option> <option value="sina.com">sina.com</option> <option value="sohu.com">sohu.com</option> <option value="tom.com">tom.com</option> <option value="126.com">126.com</option> <option value="163.com">163.com</option> <option value="yahoo.com.cn">yahoo.com.cn</option> <option value="kingsoft.com">kingsoft.com</option> </select> <input name="dmtxt" id="dmtxt" type="text" value="" onMouseOver="this.select();this.focus();" style="position:absolute;top:0px; width: 95px; height:21px; left:0px;"> 使用css2.0的 clip属性实现