本文詳細(xì)介紹使用HTML 5 和CSS3 制作一個(gè)登錄頁面的完整過程。

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 – 輸入框的簡短提示，當(dāng)該輸入框獲得輸入焦點(diǎn)時(shí)，該提示信息自動(dòng)消失

◆ required – 指定該輸入元素是否必須提供

◆ autofocus – 指定輸入框是否在頁面加載完畢自動(dòng)獲取輸入焦點(diǎn)

◆ type=”password” – 指定密碼輸入(非HTML5專有)

CSS

在這里我們用到了 CSS3 的一些專有屬性，包括：

Box-shadow 可以幫我們制作效果很好的邊框陰影

#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 (縫效果)

#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 (微妙的漸變線)

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;  
} 

最終結(jié)果

View demo

結(jié)論

在一些老的瀏覽器上也表現(xiàn)不錯(cuò)，下圖是在IE8下的效果：

原文：www.hqchn.com