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表单校验

 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4     <meta charset="utf-8">
 5     <title>表单验证</title>
 6     <script type="text/javascript">
 7         // 检查两次密码输入是否一致
 8         function checkPwdAndRepwd(isEmpty2, isEmpty3){
 9             if (isEmpty2 && isEmpty3) {
10                 var pwd = document.getElementById("password").value;
11                 var repwd = document.getElementById("re_password").value;
12                 var spMsgEl = document.getElementById("re_passwordMsg");
13                 if (pwd == repwd) {
14                     spMsgEl.innerHTML="";
15                     return true;
16                 } else {
17                     spMsgEl.innerHTML="两次密码不一致";
18                     return false;
19                 }
20             } else {
21                 return false;
22             }
23         }
24         // 检查元素值是否非空
25         function checkNotEmpty(id){
26             var value = document.getElementById(id).value;
27             var spMsgEl = document.getElementById(id+"Msg");
28             if (value == "") {
29                 spMsgEl.innerHTML = "信息不能为空";
30                 return false;
31             } else {
32                 spMsgEl.innerHTML="";
33                 return true;
34             }
35         }
36         // 检查表单
37         function checkForm(){
38             var flag1 = checkNotEmpty("username");
39             var flag2 = checkNotEmpty("password");
40             var flag3 = checkNotEmpty("re_password");
41             var isEqual = checkPwdAndRepwd(flag2,flag3);
42             var flag4 = checkNotEmpty("nickname");
43             var flag5 = checkNotEmpty("birthday");
44             return flag1 && isEqual && flag4 && flag5;
45         }
46     </script>
47 </head>
48 <body>
49     <h2 align="center">新用户注册</h2>
50     <form action="#" method="post" onsubmit="return checkForm()">
51         <table align="center">
52             <tr>
53                 <td>用户名:</td>
54                 <td><input type="text" name="username" id="username"></td>
55                 <td><font color="red" size="3"><span id="usernameMsg"></span></font></td>
56             </tr>
57             <tr>
58                 <td>密&nbsp;&nbsp;&nbsp;码:</td>
59                 <td><input type="password" name="password" id="password"></td>
60                 <td><font color="red" size="3"><span id="passwordMsg"></span></font></td>
61             </tr>
62             <tr>
63                 <td>确认密码:</td>
64                 <td><input type="password" name="re_password" id="re_password"></td>
65                 <td><font color="red" size="3"><span id="re_passwordMsg"></span></font></td>
66             </tr>
67             <tr>
68                 <td>昵&nbsp;&nbsp;&nbsp;称</td>
69                 <td><input type="text" name="nickname" id="nickname"></td>
70                 <td><font color="red" size="3"><span id="nicknameMsg"></span></font></td>
71             </tr>
72             <tr>
73                 <td>生&nbsp;&nbsp;&nbsp;日:</td>
74                 <td><input type="date" name="birthday" id="birthday"></td>
75                 <td><font color="red" size="3"><span id="birthdayMsg"></span></font></td>
76             </tr>
77             <tr>
78                 <td colspan="3" align="center">
79                     <input type="button" value="注册" />&nbsp;&nbsp;
80                     <input type="submit" value="登录" />
81                 </td>
82             </tr>
83         </table>
84     </form>
85 </body>
86 </html>

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原文地址：https://www.cnblogs.com/datapool/p/6817724.html