ajax verification username and password, ajax verification username_PHP tutorial

ajax verifies user name and password, ajax verifies user name

<span><span> 1</span>     <span>var</span> user = form.name.<span>value;
</span><span> 2</span>     <span>var</span> password = form.password.<span>value;
</span><span> 3</span>     <span>var</span> url = "chkname.php?user="+user+"&password="+password;<span>//</span><span>以前只知道ajax用于对用户名的检测，原来还可以对密码进行检测。</span>
<span> 4</span>     xmlhttp.open("GET",url,<span>true</span><span>);
</span><span> 5</span>     xmlhttp.onreadystatechange = <span>function</span><span>(){
</span><span> 6</span>     <span>if</span>(xmlhttp.readyState == 4<span>){
</span><span> 7</span>             <span>var</span> msg = xmlhttp.<span>responseText;
</span><span> 8</span>             <span>if</span>(msg == '1'<span>){
</span><span> 9</span>                 alert('用户名或密码错误!!'<span>);
</span><span>10</span>                 form.password.<span>select();
</span><span>11</span>                 form.check.value = ''<span>;
</span><span>12</span> <span>                code(form);
</span><span>13</span>                 <span>return</span> <span>false</span><span>;
</span><span>14</span>             }<span>if</span>(msg == "3"<span>){
</span><span>15</span>                 alert("用户名被占用，请重新输入！"<span>);
</span><span>16</span>                 <span>return</span> <span>false</span><span>;
</span><span>17</span>             }<span>else</span><span>{
</span><span>18</span>                 alert('欢迎光临'<span>);
</span><span>19</span>                 location.<span>reload();
</span><span>20</span> <span>            }
</span><span>21</span> <span>        }
</span><span>22</span> <span>    }
</span><span>23</span>     xmlhttp.send(<span>null</span><span>);
</span><span>24</span>     <span>return</span> <span>false</span>;</span>

php implements user name and user verification in the database through ajax

The first step requires a jq js file
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74df753ddf0f071f3ec85edaf13215f9baseUrl ?>/public/js/jq1.7.js" >2cacc6d41bbb37262a98f745aa00fbf0
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$(document).ready(function(){
$("#submit").click(function() {
if( $("#uname").val() == "" || $("#upas").val() == "" ){
alert("Username or password Cannot be empty");
return false;
}else{
$("#showerrormessage").load(
'ac16d2860bd74e5b9f1019bec2b4bd2fbaseUrl ?>/ index/login',
{uname:$("#uname").val(),upas:$("#upas").val()},
function(data){
if (data == 1){
$("#showerrormessage").html('login success!!!');
}else{
$("#showerrormessage").html('login error~~~');
}
}
);
}
});
});
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Username:

I want to use jsp+ajax technology to implement user name and password verification for login, mainly using javascript