js中的ajax问题

zhaopei010203 2011-06-06 05:24:25

<title>ajax用户验证</title>
<head>
<script language="javascript">

function check()
{

if(document.getElementById("name").value!="")
{
var xmlHttp;
function S_xmlhttprequest(){
xmlHttp=null;
if (window.XMLHttpRequest){// code for IE7, Firefox, Opera, etc.
xmlHttp=new XMLHttpRequest();
}
else if (window.ActiveXObject){// code for IE6, IE5
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
}
//xmlHttp.open("GET","date1.php?name="+document.getElenentById("name").value,true);
xmlHttp.onreadystatechange = function();
{
/*if(xmlHttp.readyState ==1)
{
document.getElementById("name1").innerHTML = "检测中......";
}
*/
if(xmlHttp.status == 200 && xmlHttp.readyState ==4)
{

var name = xmlHttp.responseText;
document.getElementById("name1").innerHTML =name;

}
}
xmlHttp.open("GET","date1.php?name="+document.getElenentById("name").value,true);
//xmlHttp.onreadystatechange = byname;
xmlHttp.send(null);
//xmlHttp.send(null);
}
}
else
{
document.getElementById("name1").innerHTML="用户名不能为空";
//exit;
}
}

function pwd()
{
if(document.getElementById("pwd2").value=="")
{
document.getElementById("pwd1").innerHTML="密码不能为空";
//exit;
}
else
{
document.getElementById("pwd1").innerHTML="该密码强度.....";
}
}
</script>
</head>
<body>
<table align="center">
<tr><td>用户名:</td><td><input type="text" name="name" id="name" value="" onblur="check()"/>
</td><td><div id="name1"><font color="#CC66CC">*用户名必填*</font></div></td></tr>
<tr><td>密码:</td><td><input type="text" name="pwd2" id="pwd2" value="" onblur="pwd()"/>
</td><td><div id="pwd1"><font color="#CC66CC">*密码必填*</font></div></td></tr>
</table>
</body>

为什么老是提示在21行有个错误就是 “缺少 {”?
希望帮忙给看看

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toury 2011-06-07

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3楼有手误，看这个。



<title>ajax用户验证</title>

<head>

<script language="javascript">

function $(id){return document.getElementById(id)}

function check(){

  $("name1").innerHTML = "检测中......";}

  if($("name").value==""){$("name1").innerHTML="用户名不能为空"; return;}

  var xmlHttp=new XMLHttpRequest()||new ActiveXObject("Microsoft.XMLHTTP");

  if(!xmlHttp){

    alert('创建AJAX对象失败！');  return;

  }

  

  xmlHttp.onreadystatechange = function(){

    if(xmlHttp.readyState==4{

      if(xmlhttp.status==200||xmlhttp.status==0){

        var ret = xmlHttp.responseText;

        $("name1").innerHTML =ret;    

      }

    }

    $("name1").innerHTML = "检测失败！";}

  }

  xmlHttp.open("GET","date1.php?name="+$("name").value+"&"+new Date().getTime(),true);

  xmlHttp.send(null);

}



function pwd(){

  var msg=$("pwd2").value=="密码不能为空"?"该密码强度.....";

  $("pwd1").innerHTML=msg;

}

</script>

</head>

<body>

<table align="center">

<tr><td>用户名:</td><td><input type="text" name="name" id="name" value="" onblur="check()"/>

</td><td><div id="name1"><font color="#CC66CC">*用户名必填*</font></div></td></tr>

<tr><td>密码:</td><td><input type="text" name="pwd2" id="pwd2" value="" onblur="pwd()"/>

</td><td><div id="pwd1"><font color="#CC66CC">*密码必填*</font></div></td></tr>

</table>

</body>

toury 2011-06-07

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<title>ajax用户验证</title>

<head>

<script language="javascript">

function $(id){return doxument.getElementById(id)}

function check(){

	$("name1").innerHTML = "检测中......";}

  if($("name").value==""){$("name1").innerHTML="用户名不能为空"; return;}

  var xmlHttp=new XMLHttpRequest()||new ActiveXObject("Microsoft.XMLHTTP");

  if(!xmlHttp){

  	alert('创建AJAX对象失败！');  return;

  }

  

  xmlHttp.onreadystatechange = function(){

    if(xmlHttp.readyState==4{

      if(xmlhttp.status==200||xmlhttp.status==0){

        var ret = xmlHttp.responseText;

        $("name1").innerHTML =ret;    

      }

    }

    $("name1").innerHTML = "检测失败！";}

  }

  xmlHttp.open("GET","date1.php?name="+$("name").value+"&"+new Date().getTime(),true);

  xmlHttp.send(null);

}



function pwd(){

	var msg=$("pwd2").value=="密码不能为空"?"该密码强度.....";

  $("pwd1").innerHTML=msg;

}

</script>

</head>

<body>

<table align="center">

<tr><td>用户名:</td><td><input type="text" name="name" id="name" value="" onblur="check()"/>

</td><td><div id="name1"><font color="#CC66CC">*用户名必填*</font></div></td></tr>

<tr><td>密码:</td><td><input type="text" name="pwd2" id="pwd2" value="" onblur="pwd()"/>

</td><td><div id="pwd1"><font color="#CC66CC">*密码必填*</font></div></td></tr>

</table>

</body>

hch126163 2011-06-07

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xmlHttp.onreadystatechange = function();
分号加错地方了吧

inetfuture 2011-06-06

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这里：



var xmlHttp;

        function S_xmlhttprequest(){

            xmlHttp=null;

            if (window.XMLHttpRequest){// code for IE7, Firefox, Opera, etc.

                xmlHttp=new XMLHttpRequest();

            }

            else if (window.ActiveXObject){// code for IE6, IE5

                xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");

            }

        }

你定义了创建xmlHttpRequest对象的函数，但该函数没有被调用吧？也就是xmlHttp没有创建……