Ajax之Jquery封装使用举例

 1 <html>
 2 <head>
 3     <meta charset="UTF-8">
 4     <title>登陆页面</title>
 5     <link rel='stylesheet prefetch' href='https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css'>
 6     <link rel="stylesheet" href="css/style.css">
 7     <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
 8 
 9     <script type="text/javascript">
10         function sub() {
11             var name = $("#name").val();
12             var password = $("#password").val();
13             //第二步：验证数据，这里需要从数据库调数据，我们就用到了ajax
14             $.ajax({
15                 url: "/submit",//请求地址
16                 data: {name: name, password: password},//提交的数据
17                 type: "POST",//提交的方式
18                 dataType: "TEXT", //返回类型 TEXT字符串 JSON XML
19                 success: function (data) { // 校验返回内容，进行跳转
20                     //开始之前要去空格，用trim()
21                     if (data.trim() == "true") {
22                         window.location.href = "/welcome?name=" + name;
23                     }
24                     else {
25                         alert("用户名或者密码错误!");
26                     }
27                 },
28                 error: function (xhr) {
29                     // 失败输出HTTP状态码
30                     alert("调用失败！HTTP状态码：" + xhr.status);
31                 }
32             })
33         }
34     </script>
35 </head>
36 
37 <body>
38 <div class="wrapper">
39     <div class="form-signin">
40         <h2 class="form-signin-heading">请登陆</h2>
41         <input type="text" class="form-control" value="tom" name="name" id="name" placeholder="用户名" required=""
42                autofocus=""/>
43         <input type="password" class="form-control" value="123" name="password" id="password" placeholder="密码"
44                required=""/>
45         <label class="checkbox">
46             <input type="checkbox" value="remember-me" id="rememberMe" name="rememberMe">记住我
47             <a href="infoSubmit.html" class="regsiter">注册</a>
48         </label>
49         <button type="submit" id="btn" class="btn btn-lg btn-primary btn-block" onclick="sub()">登陆</button>
50     </div>
51 </div>
52 </body>
53 
54 </html>

style.css

 1 body {
 2     background: #eee !important;
 3 }
 4 
 5 .wrapper {
 6     margin-top: 80px;
 7     margin-bottom: 80px;
 8 }
 9 
10 .form-signin {
11     max-width: 380px;
12     padding: 15px 35px 45px;
13     margin: 0 auto;
14     background-color: #fff;
15     border: 1px solid rgba(0, 0, 0, 0.1);
16 }
17 
18 .form-signin .form-signin-heading,
19 .form-signin .checkbox {
20     margin-bottom: 30px;
21 }
22 
23 .form-signin .checkbox {
24     font-weight: normal;
25 }
26 
27 .form-signin .form-control {
28     position: relative;
29     font-size: 16px;
30     height: auto;
31     padding: 10px;
32     -webkit-box-sizing: border-box;
33     -moz-box-sizing: border-box;
34     box-sizing: border-box;
35 }
36 
37 .form-signin .form-control:focus {
38     z-index: 2;
39 }
40 
41 .form-signin input[type="text"] {
42     margin-bottom: -1px;
43     border-bottom-left-radius: 0;
44     border-bottom-right-radius: 0;
45 }
46 
47 .form-signin input[type="password"] {
48     margin-bottom: 20px;
49     border-top-left-radius: 0;
50     border-top-right-radius: 0;
51 }
52 
53 .checkbox {
54     margin-left: 100px;
55 }
56 
57 .regsiter {
58     margin-left: 20px;
59 }

截图：

点击登陆按钮触发Ajax请求