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<!DOCTYPE html> <html> <head> <script> function showUser(str) { if (str=="") { document.getElementById("txtHint").innerHTML=""; return; } var xmlhttp=new XMLHttpRequest(); xmlhttp.onreadystatechange=function() { if (this.readyState==4 && this.status==200) { document.getElementById("txtHint").innerHTML=this.responseText; } } xmlhttp.open("GET","family.php?q="+str,true); xmlhttp.send(); } </script> </head> <body> <form> <select name="users" onchange="showUser(this.value)"> <option value="">选择一个人：</option> <option value="1">Peter Griffin</option> <option value="2">Lois Griffin</option> <option value="3">Joseph Swanson</option> <option value="4">Glenn Quagmire</option> </select> </form> <br> <div id="txtHint"><b>人物信息将显示在这里。</b></div> </body> </html>