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sass登陆页面实例

一、总结

一句话总结：

sass使用非常方便：使用就是将sass转化为css引入，并且动态监听让sass转化为css，可以很方便的所见即所得

1、sass安装？

npm就可以按照了：npm install -g sass

2、sass文件如何使用？

Sass使用.scss作为文件后缀名，不能直接在<link>标签中使用，需要编译为.css文件。

将sass文件转化为css文件：sass input.scss output.css

3、sass的作用是什么？

Sass可以让我们使用一些CSS中没有实现的功能，例如变量、嵌套、组合、继承等等；

4、实时监控并且将sass文件转化为css文件？

sass--watch input.scss:output.css

sass --watch scss:dist/css 将sass文件夹中的sass文件转化为dist/css文件夹中的css文件

5、弹性布局居中？

display: flex;

justify-content: center;

align-items: center;

6、弹性布局左右分布实例？

display: flex;

justify-content: space-between;

7、after做body的颜色块？

after里面可以定义内容，样式等，很方便

  &::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: $main-color;
    opacity: 0.8;
  }

8、css动画实例？

有hover属性后，可以加个transition: all 0.4s;

&:last-child {
  color: #fff;
  background: $second-color;
  transition: all 0.4s;

  &:hover {
    background: $main-color;
  }
}

9、vh使用实例？

min-height: 100vh;

body {
  position: relative;
  min-height: 100vh;
  background: url(../img/bg.jpg) no-repeat center center/cover;
  display: flex;
  justify-content: center;
  align-items: center;
}

二、sass登陆页面实例

1、效果图

2、代码

1）html代码：index.html

 1 <!DOCTYPE html>
 2 <html lang="en">
 3   <head>
 4     <meta charset="UTF-8" />
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge" />
 7     <link rel="stylesheet" href="css/main.css" />
 8     <title>Document</title>
 9   </head>
10   <body>
11     <div class="card">
12       <h3>登录后更精彩</h3>
13       <form>
14         <input type="email" id="email" name="email" placeholder="邮箱" />
15         <input type="password" id="password" name="password" placeholder="密码" />
16         <input type="submit" value="登录" />
17       </form>
18       <ul>
19         <li><a href="#">注册</a></li>
20         <li><a href="#">忘记密码</a></li>
21       </ul>
22     </div>
23   </body>
24 </html>

2）sass代码：main.scss

 1 $main-color: #2ecc71;
 2 $second-color: #27ae60;
 3 
 4 * {
 5   margin: 0;
 6   padding: 0;
 7   box-sizing: border-box;
 8 }
 9 
10 body {
11   position: relative;
12   min-height: 100vh;
13   background: url(../img/bg.jpg) no-repeat center center/cover;
14   display: flex;
15   justify-content: center;
16   align-items: center;
17 
18   &::after {
19     content: "";
20     position: absolute;
21     top: 0;
22     left: 0;
23     width: 100%;
24     height: 100%;
25     z-index: -1;
26     background: $main-color;
27     opacity: 0.8;
28   }
29 
30   .card {
31     width: 400px;
32     padding: 2rem 3rem;
33     background: #fff;
34 
35     h3 {
36       font-weight: 400;
37       color: $second-color;
38       margin-bottom: 1rem;
39     }
40 
41     form input {
42       display: block;
43       width: 100%;
44       border: 1px solid #ddd;
45       padding: 0.5rem;
46       margin-bottom: 1rem;
47 
48       &:last-child {
49         color: #fff;
50         background: $second-color;
51         transition: all 0.4s;
52 
53         &:hover {
54           background: $main-color;
55         }
56       }
57 
58       &:focus {
59         outline: 1px solid $main-color;
60       }
61     }
62 
63     ul {
64       list-style: none;
65       display: flex;
66       justify-content: space-between;
67       font-size: 0.9rem;
68 
69       li a {
70         color: #333;
71         text-decoration: none;
72         border-bottom: 1px solid transparent;
73         transition: all 0.4s;
74 
75         &:hover {
76           color: $main-color;
77           border-bottom: 1px solid $main-color;
78         }
79       }
80     }
81   }
82 }

3）css代码：main.css

 1 * {
 2   margin: 0;
 3   padding: 0;
 4   box-sizing: border-box;
 5 }
 6 
 7 body {
 8   position: relative;
 9   min-height: 100vh;
10   background: url(../img/bg.jpg) no-repeat center center/cover;
11   display: flex;
12   justify-content: center;
13   align-items: center;
14 }
15 body::after {
16   content: "";
17   position: absolute;
18   top: 0;
19   left: 0;
20   width: 100%;
21   height: 100%;
22   z-index: -1;
23   background: #2ecc71;
24   opacity: 0.8;
25 }
26 body .card {
27   width: 400px;
28   padding: 2rem 3rem;
29   background: #fff;
30 }
31 body .card h3 {
32   font-weight: 400;
33   color: #27ae60;
34   margin-bottom: 1rem;
35 }
36 body .card form input {
37   display: block;
38   width: 100%;
39   border: 1px solid #ddd;
40   padding: 0.5rem;
41   margin-bottom: 1rem;
42 }
43 body .card form input:last-child {
44   color: #fff;
45   background: #27ae60;
46   transition: all 0.4s;
47 }
48 body .card form input:last-child:hover {
49   background: #2ecc71;
50 }
51 body .card form input:focus {
52   outline: 1px solid #2ecc71;
53 }
54 body .card ul {
55   list-style: none;
56   display: flex;
57   justify-content: space-between;
58   font-size: 0.9rem;
59 }
60 body .card ul li a {
61   color: #333;
62   text-decoration: none;
63   border-bottom: 1px solid transparent;
64   transition: all 0.4s;
65 }
66 body .card ul li a:hover {
67   color: #2ecc71;
68   border-bottom: 1px solid #2ecc71;
69 }
70 
71 /*# sourceMappingURL=main.css.map */

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原文地址：https://www.cnblogs.com/Renyi-Fan/p/11989881.html