<! doctype html public "-//w3c//dtd html 4.0//en" "http://www.w3.org/tr/rec-html140/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=gb2312"> <title>ajax用户注册演示程序</title> <script language="网页特效" type="text/网页特效"> <!-- //创建函数 function createxmlhttp() { var request; var browser = navigator.appname; //使用ie，则使用xmlhttp对象 if(browser == "microsoft internet explorer") { var arrversions = ["microsoft.xmlhttp", "msxml2.xmlhttp.4.0", "msxml2.xmlhttp.3.0", "msxml2.xmlhttp","msxml2.xmlhttp.5.0"]; for (var i=0; i < arrversions.length; i++) { try { //从中找到一个支持的版本并建立xmlhttp对象 request = new activexobject(arrversions[i]); return request; } catch (exception) { //忽略，继续 } } } else { //否则返回一个xmlhttprequest对象 request = new xmlhttprequest(); if(request.overridemimetype) { request.overridemimetype('text/xml'); } return request; } } //全局xmlhttp对象实例变量 var http = createxmlhttp(); //发送请求 function chkuser() { var url = "check.php教程"; //请求"checkusername" servlet var name = document.getelementbyid("username").value; url += ("?username="+escape(name)+"&oprate=chkuser"); http.open("get",url,true); http.onreadystatechange = processhttpresponse; http.send(null); return ; } //处理响应 function processhttpresponse() { if(http.readystate == 4) { if(http.status == 200) { var xmldocument = http.responsexml; if(http.responsetext!="该用户名有效，可以使用！") { //返回的信息动态显示 document.getelementbyid("showstr").style.display = ""; document.getelementbyid("username").style.background= "#ff0000"; document.getelementbyid("showstr").innertext = http.responsetext; } else { document.getelementbyid("username").style.background= "#ffffff"; document.getelementbyid("showstr").style.display = ""; document.getelementbyid("showstr").innertext = http.responsetext; } } else { alert("你所请求的页面发生异常，可能会影响你浏览该页的信息！"); alert(http.status); } } } //检验输入密码 function chkpassword() { var m=document.form1; if(m.password.value.length>20 || m.password.value.length<6 ) { document.getelementbyid("passwordstr").style.display = ""; document.getelementbyid("password").style.background= "#ff0000"; document.getelementbyid("passwordstr").innertext = "对不起,密码必须为英文字母、数字或下划线，长度为6~20!"; } else { document.getelementbyid("password").style.background= "#ffffff"; document.getelementbyid("passwordstr").style.display = "none"; } } //验证两次密码是否一致 function chkconfirmpassword() { var m=document.form1; if (m.password.value != m.confirmpassword.value) { document.getelementbyid("confirmpasswordstr").style.display = ""; document.getelementbyid("confirmpassword").style.background= "#ff0000"; document.getelementbyid("confirmpasswordstr").innertext = "对不起,密码与重复密码不一致!"; } else { document.getelementbyid("confirmpassword").style.background= "#ffffff"; document.getelementbyid("confirmpasswordstr").style.display = "none"; } } //验证email是否有效 function chkemail() { var m=document.form1; var email = m.email.value; //正则表达式 var regex = /^([a-za-z0-9_-])+@([a-za-z0-9_-])+(.[a-za-z0-9_-])+/; var flag = regex.test(email); if(!flag) { document.getelementbyid("emailstr").style.display = ""; document.getelementbyid("email").style.background= "#ff0000"; document.getelementbyid("emailstr").innertext = "对不起,邮箱地址无效！"; } else { document.getelementbyid("email").style.background= "#ffffff"; document.getelementbyid("emailstr").style.display = "none"; } } //提交检查函数 function submitcheck() { var m=document.form1; if(m.username.value.length==0) { alert("对不起,用户名必须为英文字母、数字或下划线，长度为5~20。"); m.username.focus(); return false; } if(m.password.value.length==0) { alert("对不起,密码必须为英文字母、数字或下划线，长度为5~20。"); m.password.focus(); return false; } if (m.password.value != m.confirmpassword.value) { alert("对不起,密码与重复密码不一致!"); m.confirmpassword.focus(); return false; } if(m.email.value.length==0) { alert("对不起,邮箱地址不能为空！！"); m.email.focus(); return false; } m.submit(); } //--> </script> <body > <form name="form1" method="post" action="register.php"> <h3 align="center">ajax用户注册程序</h3> <table align="center" width="500" border="1" > <tr> <td><font color="red">*</font></td> <td width="100">用户帐号:</td> <td><input type="text" name="username" maxlength="20" style="background=#ffffff" onblur="chkuser()"></td> <td><div id="showstr" style="background-color:#ff9900;display:none"></div></td> </tr> <tr> <td><font color="red">*</font></td> <td>用户密码:</td> <td align="left"><input type="password" name="password" maxlength="22" style="background=#ffffff" onblur="chkpassword()"/> </td> <td><div id="passwordstr" style="background-color:#ff9900;display:none"></div></td> </tr> <tr> <td><font color="red">*</font></td> <td>确认密码:</td> <td><input type="password" name="confirmpassword" maxlength="20" style="background=#ffffff" onblur="chkconfirmpassword()"/></td> <td><div id="confirmpasswordstr" style="background-color:#ff9900;display:none"></div></td> </tr> <tr> <td><font color="red">*</font></td> <td>email:</td> <td><input type="text" name="email" maxlength="100" style="background=#ffffff" onblur="chkemail()"></td> <td><div id="emailstr" style="background-color:#ff9900;display:none"></div></td> </tr> </table> <div align="center"> <input type="button" name="ok" value=" 确定 " onclick="submitcheck()"> <input type="reset" name="reset" value=" 取消 "> </form> </div> </body> </html>reg.php检测程序 <?php header("content-type:text/html;charset=gb2312"); @mysql教程_connect('localhost','root','ebaeba') or die("数据库教程服务器连接失败"); @mysql_select_db("test") or die("数据库不存在或不可用"); $uname = $_get['username']; //下面进行数据库查询 查找是不是有这一个用户 //如果没有查找到这个用户名 $sql="select * from t1 where name='".$uname."'"; $query=mysql_query($sql); $row=mysql_fetch_object($query); if(strlen($uname)<6||strlen($uname)>20) { $msg="用户名必须是6至20个字符."; } else { if($row==false) { $msg="该用户名有效，可以使用！"; } else { $msg="对不起，此用户名已经存在，请更换用户名注册!"; } } echo $msg ; ?>