使用HTML 5和CSS3制作登录页面完整步骤

本文详细介绍使用HTML 5 和CSS3 制作一个登录页面的完整过程。

View demo

login.html

<form id="login"> 



    <h1>Log In</h1> 




    <fieldset id="inputs"> 




        <input id="username" type="text" placeholder="Username" autofocus required> 




        <input id="password" type="password" placeholder="Password" required> 




    </fieldset> 




    <fieldset id="actions"> 




        <input type="submit" id="submit" value="Log in"> 




        <a href="">Forgot your password?</a><a href="">Register</a> 




    </fieldset> 




</form> 

所用到的HTML 5的特性：

◆ placeholder – 输入框的简短提示，当该输入框获得输入焦点时，该提示信息自动消失

◆ required – 指定该输入元素是否必须提供

◆ autofocus – 指定输入框是否在页面加载完毕自动获取输入焦点

◆ type=”password” – 指定密码输入(非HTML5专有)

CSS

在这里我们用到了 CSS3 的一些专有属性，包括：

Box-shadow 可以帮我们制作效果很好的边框阴影

#login  


{  


    box-shadow:  


          0 0 2px rgba(0, 0, 0, 0.2),  


          0 1px 1px rgba(0, 0, 0, .2),  


          0 3px 0 #fff,  


          0 4px 0 rgba(0, 0, 0, .2),  


          0 6px 0 #fff,  


          0 7px 0 rgba(0, 0, 0, .2);  


} 

Stitch effect (缝效果)

#login  


{  


    position: absolute;  


    z-index: 0;  


}  


 


#login:before  


{  


    content: '';  


    position: absolute;  


    z-index: -1;  


    border: 1px dashed #ccc;  


    top: 5px;  


    bottom: 5px;  


    left: 5px;  


    right: 5px;  


    -moz-box-shadow: 0 0 0 1px #fff;  


    -webkit-box-shadow: 0 0 0 1px #fff;  


    box-shadow: 0 0 0 1px #fff;  


} 

Subtle gradient lines (微妙的渐变线)

h1  


{  


    text-shadow: 0 1px 0 rgba(255, 255, 255, .7), 0px 2px 0 rgba(0, 0, 0, .5);  


    text-transform: uppercase;  


    text-align: center;  


    color: #666;  


    margin: 0 0 30px 0;  


    letter-spacing: 4px;  


    font: normal 26px/1 Verdana, Helvetica;  


    position: relative;  


}  


 


h1:after, h1:before  


{  


    background-color: #777;  


    content: "";  


    height: 1px;  


    position: absolute;  


    top: 15px;  


    width: 120px;  


}  


 


h1:after  


{  


    background-image: -webkit-gradient(linear, left top, right top, from(#777), to(#fff));  


    background-image: -webkit-linear-gradient(left, #777, #fff);  


    background-image: -moz-linear-gradient(left, #777, #fff);  


    background-image: -ms-linear-gradient(left, #777, #fff);  


    background-image: -o-linear-gradient(left, #777, #fff);  


    background-image: linear-gradient(left, #777, #fff);  


    right: 0;  


}  


 


h1:before  


{  


    background-image: -webkit-gradient(linear, right top, left top, from(#777), to(#fff));  


    background-image: -webkit-linear-gradient(right, #777, #fff);  


    background-image: -moz-linear-gradient(right, #777, #fff);  


    background-image: -ms-linear-gradient(right, #777, #fff);  


    background-image: -o-linear-gradient(right, #777, #fff);  


    background-image: linear-gradient(right, #777, #fff);  


    left: 0;  


} 

最终结果

View demo

结论