php+js+mysql设计的仿webQQ-<2>其他验证

function checkNickname(Nickname)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("error2").innerHTML="<font color=red size=2px>*</font>";   //复位
if(Nickname.length==0)
{
document.getElementById("error2").innerHTML="<font color=red size=2px>*昵称不能为空！</font>";
}
else
{
if(Nickname.length>16)
{
document.getElementById("error2").innerHTML="<font color=red size=2px>*昵称不要超过16个字符！</font>";
}
else
{
document.getElementById("error2").innerHTML="<font color=green size=2px>*昵称可用！</font>";
}
}
}
}
xmlhttp.open("GET","index.php",true);
xmlhttp.send();         //注意这里与邮箱验证的不同
}

function checkPwd1(password1)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{  document.getElementById("error3").innerHTML="<font color=red size=2px>*</font>";
document.getElementById("password2").value="";
document.getElementById("error4").innerHTML="<font color=red size=2px>*</font>";
if(password1.length==0)
{
document.getElementById("error3").innerHTML="<font color=red size=2px>*密码不能为空！</font>";

}
else
{
if(password1.length<6||password1.length>16)
{
document.getElementById("error3").innerHTML="<font color=red size=2px>*密码为6-16个字符！</font>";

}
else
{
var reg=/[a-zA-Z0-9]/;     //在js中使用正则表达式
if(reg.test(password1))
{
document.getElementById("error3").innerHTML="<font color=green size=2px>*密码可用！</font>";
}
else
{
document.getElementById("error3").innerHTML="<font color=red size=2px>*密码不可用！</font>";

}
}
}
}
}
xmlhttp.open("GET","index.php",true);
xmlhttp.send();
}

function checkPwd2(password2)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{  document.getElementById("error4").innerHTML="<font color=red size=2px>*</font>";
if(password2.length==0)
{
document.getElementById("error4").innerHTML="<font color=red size=2px>*请确认密码！</font>";

}
else
{
if(password2!=document.getElementById("password1").value)
{
document.getElementById("error4").innerHTML="<font color=red size=2px>*两次密码输入不一致！</font>";

}
else
{
document.getElementById("error4").innerHTML="<font color=green size=2px>*密码输入一致！</font>";
}

}
}
}
xmlhttp.open("GET","index.php",true);
xmlhttp.send();
}