jQuery text box simulates drop-down list effect_jquery

The web page code is as follows:

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title> </title>New Web Project <input type="text" id="test" name="test"> <button type="button" onclick="alert($('#test').serialize())"> </button> Submit After running, you need to refresh it before you can load jquery.