<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>更换背景</title></head><body id = "body"><select name="select" onclick="changeBgImg(this)"> <option value="http://pic20.nipic.com/20120418/6759425_130642327185_2.jpg">one</option> <option value="http://pic17.nipic.com/20111122/6759425_152002520144_2.jpg">two</option> <option value="http://pic17.nipic.com/20111122/6759425_152002637140_2.jpg">three</option></select></body></html><script language="javascript" type="text/javascript">function changeBgImg(option){ document.getElementById("body").style.backgroundImage = "url("+option.options[option.selectedIndex].value+")";}</script>再分享一下我老师大神的人工智能教程吧。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.csdn.net/jiangjunshow