ajax验证用户名和找回密码参考

 1 // JavaScript Document
 2 function chkname(form){
 3     var user = form.user.value;
 4     if(user == ‘‘){
 5         alert(‘请输入用户名‘);
 6         form.user.focus();
 7         return false;
 8     }else{
 9         var url = "foundpwd.php?user="+user;
10         xmlhttp.open("GET",url,true);
11         xmlhttp.onreadystatechange = function(){
12         if(xmlhttp.readyState == 4){
13                 var msg = xmlhttp.responseText;
14                 if(msg == ‘0‘){
15                     alert(‘没有该用户，请重新查找!‘);
16                     form.user.select();
17                     return false;
18                 }else{
19                     document.getElementById(‘first‘).style.display = ‘none‘;
20                     document.getElementById(‘second‘).style.display = ‘‘;
21                     document.getElementById(‘question‘).innerHTML = msg;
22                 }
23             }
24         }
25         xmlhttp.send(null);
26     }
27 }
28 function chkanswer(form) {
29     var user = document.getElementById(‘user‘).value;
30     var answer = form.answer.value;
31     if(answer == ‘‘){
32         alert(‘请输入提示问题‘);
33         form.answer.focus();
34         return false;
35     }else{
36         var url = "foundpwd.php?user="+user+"&answer="+answer;
37         xmlhttp.open("GET",url,true);
38         xmlhttp.onreadystatechange = function(){
39             if(xmlhttp.readyState == 4){
40                 var msg = xmlhttp.responseText;
41                 if(msg == ‘0‘){
42                     alert(‘问题回答错误‘);
43                     form.answer.select();
44                     return false;
45                 }else{
46                     document.getElementById(‘second‘).style.display = ‘none‘;
47                     document.getElementById(‘third‘).style.display = ‘‘;
48                 }
49             }
50         }
51         xmlhttp.send(null);
52     }
53 }
54 function chkpwd(form){
55     var user = document.getElementById(‘user‘).value;
56     var pwd1 = form.pwd1.value;
57     var pwd2 = form.pwd2.value;
58     if(pwd1 == ‘‘){
59         alert(‘请输入密码‘);
60         form.pwd1.focus();
61         return false;
62     }
63     if(pwd1.length < 6){
64         alert(‘密码输入错误‘);
65         form.pwd1.focus();
66         return false;
67     }
68     if(pwd1 != pwd2){
69         alert(‘两次密码不相等‘);
70         form.pwd2.select();
71         return false;
72     }
73     var url = "foundpwd.php?user="+user+"&password="+pwd1;
74     xmlhttp.open("GET",url,true);
75     xmlhttp.onreadystatechange = function(){
76         if(xmlhttp.readyState == 4){
77             var msg = xmlhttp.responseText;
78             if(msg == ‘1‘){
79                 alert(‘密码修改成功，请重新登录‘);
80                 window.close();
81             }else{
82                 alert(msg);
83             }
84         }
85     }
86     xmlhttp.send(null);
87 }