js注册验证【转】

function getFocus()  //设置用户名文本框获取焦点
{
    document.getElementById("txtuname").focus();
}

function checkname()  //检查用户名
{
    var myname=document.getElementById("txtuname").value;
    var myDivname=document.getElementById("uname");
    if(myname=="")
    {
        myDivname.innerHTML="<font color='red'>用户名不能为空!</font>";
        return false;
    }
    for(var i=0;i<myname.length;i++)
    {
        var text=myname.charAt(i);
        if(!(text<=9&&text>=0)&&!(text>='a'&&text<='z')&&!(text>='A'&&text<='Z')&&text!="_")
        {
         myDivname.innerHTML="<font color='red'>用户名只能是数字、字母、下划线组成！</font>";
         break;
        }
    }
    if(i>=myname.length)
    {
        myDivname.innerHTML="<font color='red'>√</font>";
        return true;
    }
}

function checkuserpassword()  //检查密码
{
 var mypassword=document.getElementById("txtuserpassword").value;
 var myDivpassword=document.getElementById("userpassword");
 if(mypassword=="")
 {
  myDivpassword.innerHTML="<font color='red'>密码不能为空!</font>";
  return false;
 }
 else if(mypassword.length<6)
 {
  myDivpassword.innerHTML="<font color='red'>密码至少应为六位!</font>";
  return false;
 }
 else
 {
  myDivpassword.innerHTML="<font color='red'>√</font>";
  return true;
 }
}

function checkpwdagin()  //检查确认密码
{
 var myispassword=document.getElementById("txtpwdagin").value;
 var myDivispassword=document.getElementById("pwdagin");
 if(myispassword=="")
 {
     myDivispassword.innerHTML="<font color='red'>确认密码不能为空!</font>";
     return false;
 }
 else if(document.getElementById("txtuserpassword").value!=document.getElementById("txtpwdagin").value)
 {
  myDivispassword.innerHTML="<font color='red'>确认密码与密码不一致!</font>";
  return false;
 }
 else
 {
  myDivispassword.innerHTML="<font color='red'>√</font>";
  return true;
 }
}

function checktelephone()  //检查电话号码
{
 var mytelephone=document.getElementById("txttelephone").value;
 var myDivtelephone=document.getElementById("telephone");
 if(mytelephone!="")
 {
     var reg = /^[0-9]{11}$/i;
     if(!reg.test(mytelephone))
        {
            myDivtelephone.innerHTML="<font color='red'>只能输入11位数字！例：13595144582或08514785214</font>";
            return false;
        }
     else
     {
      myDivtelephone.innerHTML="<font color='red'>√</font>";
      return true;
     }
 }
 else
 {
     myDivtelephone.innerHTML="<font color='red'>√</font>";
     return true;
 }
}

function checkemail()  //检查E-mail
{
 var myemail=document.getElementById("txtemail").value;
 var myDivemail=document.getElementById("email");
 if(myemail!="")
 {
     if(myemail.indexOf("@")==-1||myemail.indexOf(".")==-1||(myemail.indexOf("@")>myemail.indexOf(".")))
     {
      myDivemail.innerHTML="<font color='red'>E-mail格式不正确！例：[e-mail]</font>";
      return false;
     }
     else
     {
      myDivemail.innerHTML="<font color='red'>√</font>";
      return true;
     }
 }
 else
 {
     myDivemail.innerHTML="<font color='red'>√</font>";
     return true;
 }
}

function checkqq()  //检查QQ号码
{
 var myqq=document.getElementById("txtqq").value;
 var myDivqq=document.getElementById("divqq");
 if(myqq!="")
 {
     if(myqq.match(/\D/)!=null)
     {
      myDivqq.innerHTML="<font color='red'>QQ号码只能输入数字！</font>";
      return false;
     }
     else
     {
      myDivqq.innerHTML="<font color='red'>√</font>";
      return true;
     }
 }
 else
 {
     myDivqq.innerHTML="<font color='red'>√</font>";
     return true;
 }
}

function checkall()  //检查所有
{
    if(checkname()&&checkuserpassword()&&checkpwdagin()&&checktelephone()&&checkemail()&&checkqq())
    {
        return true;
    }
    return false;
}

//复选框的选中与否是按钮的状态
function checkcjkx()
{
    var a=document.form1.btnregister;
    if(a==null)
    {
        return
    }
    if(document.form1.ckbxcjkx!=null)
    {
        if(document.form1.ckbxcjkx.checked)
        {
            a.disabled=false;
            return
        }
        else
        {
            a.disabled=true;
            return
        }
    }
    else
    {
        a.disabled=true;
        return
    }
}