核心属性
opacity: .999 使元素产生一个层叠上下文,这样按钮6和8的动画就不会被背景遮盖住了
left/top: -1px 使伪元素与按钮的位置重合,原因在下方
transition-delay 横向与纵向边框动画产生细微的延时效果
z-index: -1 防止动画产生的颜色块盖住按钮的文字
设置了left/top/right/bottom的absolute元素,是相对于父元素的padding-box进行定位的,所以这里伪元素要移动一个边框的距离,才能与按钮的位置重合,否则会出现下面的效果:
可以看到,绿色边框和灰色边框有1px的距离
-
<div class="main-container">
-
<section>
-
<button class="btn btn-green btn-border-o">按钮一</button>
-
<button class="btn btn-blue btn-border">按钮二</button>
-
<button class="btn btn-purple btn-border-rev-o">按钮三</button>
-
<button class="btn btn-navy btn-border-rev">按钮四</button>
-
</section>
-
<section>
-
<button class="btn btn-orange btn-fill-vert-o">按钮五</button>
-
<button class="btn btn-red btn-fill-vert">按钮六</button>
-
<button class="btn btn-green btn-fill-horz-o">按钮七</button>
-
<button class="btn btn-blue btn-fill-horz">按钮八</button>
-
</section>
-
</div>
-
*, *:before, *:after {
-
transition: all 0.3s;
-
}
-
section {
-
position: relative;
-
padding: 5px 0 5px;
-
text-align: center;
-
}
-
.btn {
-
position: relative;
-
display: inline-block;
-
line-height: 35px;
-
margin: 8px;
-
padding: 0 15px;
-
font-size: 15px;
-
border-radius: 3px;
-
opacity: .999;
-
cursor: pointer;
-
}
-
.btn-border-o {
-
background-color: transparent;
-
border: 1px solid #d0d0d0;
-
color: #B8B8B8;
-
}
-
.btn-border-o:before, .btn-border-o:after {
-
content: '';
-
position: absolute;
-
border-style: solid;
-
border-radius: 3px;
-
box-sizing: content-box;
-
}
-
.btn-border-o:before {
-
left: 0;
-
top: -1px;
-
width: 0;
-
height: 100%;
-
border-width: 1px 0 1px 0;
-
transition-delay: 0.05s;
-
}
-
.btn-border-o:after {
-
top: 0;
-
left: -1px;
-
width: 100%;
-
height: 0;
-
border-width: 0 1px 0 1px;
-
}
-
.btn-border-o:hover:before {
-
width: 100%;
-
}
-
.btn-border-o:hover:after {
-
height: 100%;
-
}
-
.btn-border-o.btn-green:before, .btn-border-o.btn-green:after {
-
border-color: #2ecc71;
-
}
-
.btn-border-o.btn-green:hover {
-
color: #2ecc71;
-
}
-
.btn-border {
-
background-color: #e5e5e5;
-
border: 1px solid #e5e5e5;
-
color: #a6a6a6;
-
}
-
.btn-border:before, .btn-border:after {
-
position: absolute;
-
content: '';
-
border-style: solid;
-
border-radius: 3px;
-
box-sizing: content-box;
-
}
-
.btn-border:before {
-
top: -1px;
-
left: 0;
-
width: 0;
-
height: 100%;
-
border-width: 1px 0 1px 0;
-
transition-delay: 0.05s;
-
}
-
.btn-border:after {
-
top: 0;
-
left: -1px;
-
width: 100%;
-
height: 0;
-
border-width: 0 1px 0 1px;
-
}
-
.btn-border:hover {
-
background-color: transparent;
-
}
-
.btn-border:hover:before {
-
width: 100%;
-
}
-
.btn-border:hover:after {
-
height: 100%;
-
}
-
.btn-border.btn-blue:before, .btn-border.btn-blue:after {
-
border-color: #3498db;
-
}
-
.btn-border.btn-blue:hover {
-
color: #3498db;
-
}
-
.btn-border-rev-o {
-
background-color: transparent;
-
border: 1px solid #d0d0d0;
-
color: #B8B8B8;
-
}
-
.btn-border-rev-o:before, .btn-border-rev-o:after {
-
content: '';
-
position: absolute;
-
border-style: solid;
-
border-radius: 3px;
-
box-sizing: content-box;
-
}
-
.btn-border-rev-o:before {
-
top: -1px;
-
right: 0;
-
width: 0;
-
height: 100%;
-
border-width: 1px 0 1px 0;
-
transition-delay: 0.05s;
-
}
-
.btn-border-rev-o:after {
-
left: -1px;
-
bottom: 0;
-
width: 100%;
-
height: 0;
-
border-width: 0 1px 0 1px;
-
}
-
.btn-border-rev-o:hover:before {
-
width: 100%;
-
}
-
.btn-border-rev-o:hover:after {
-
height: 100%;
-
}
-
.btn-border-rev-o.btn-purple:before, .btn-border-rev-o.btn-purple:after {
-
border-color: #9b59b6;
-
}
-
.btn-border-rev-o.btn-purple:hover {
-
color: #9b59b6;
-
}
-
.btn-border-rev {
-
background-color: #e5e5e5;
-
border: 1px solid #e5e5e5;
-
color: #a6a6a6;
-
}
-
.btn-border-rev:before, .btn-border-rev:after {
-
content: '';
-
position: absolute;
-
border-style: solid;
-
border-radius: 3px;
-
box-sizing: content-box;
-
}
-
.btn-border-rev:before {
-
top: -1px;
-
right: 0;
-
width: 0;
-
height: 100%;
-
border-width: 1px 0 1px 0;
-
}
-
.btn-border-rev:after {
-
bottom: 0;
-
left: -1px;
-
width: 100%;
-
height: 0;
-
border-width: 0 1px 0 1px;
-
transition-delay: 0.05s;
-
}
-
.btn-border-rev:hover {
-
background-color: transparent;
-
}
-
.btn-border-rev:hover:before {
-
width: 100%;
-
}
-
.btn-border-rev:hover:after {
-
height: 100%;
-
}
-
.btn-border-rev.btn-navy:before, .btn-border-rev.btn-navy:after {
-
border-color: #34495e;
-
}
-
.btn-border-rev.btn-navy:hover {
-
color: #34495e;
-
}
-
.btn-fill-vert-o {
-
background-color: transparent;
-
border: 1px solid #d0d0d0;
-
color: #B8B8B8;
-
overflow: hidden;
-
}
-
.btn-fill-vert-o:before, .btn-fill-vert-o:after {
-
content: '';
-
position: absolute;
-
left: 0;
-
width: 100%;
-
height: 0;
-
opacity: 0;
-
z-index: -1;
-
}
-
.btn-fill-vert-o:before {
-
top: 50%;
-
}
-
.btn-fill-vert-o:after {
-
bottom: 50%;
-
}
-
.btn-fill-vert-o:hover {
-
color: #fff;
-
}
-
.btn-fill-vert-o:hover:before, .btn-fill-vert-o:hover:after {
-
height: 50%;
-
opacity: 1;
-
}
-
.btn-fill-vert-o.btn-orange:before, .btn-fill-vert-o.btn-orange:after {
-
background-color: #e67e22;
-
}
-
.btn-fill-vert-o.btn-orange:hover {
-
border-color: #e67e22;
-
}
-
.btn-fill-vert {
-
background-color: #e5e5e5;
-
border: 1px solid #e5e5e5;
-
color: #a6a6a6;
-
overflow: hidden;
-
}
-
.btn-fill-vert:before, .btn-fill-vert:after {
-
content: '';
-
position: absolute;
-
width: 100%;
-
height: 0;
-
opacity: 0;
-
left: 0;
-
z-index: -1;
-
}
-
.btn-fill-vert:before {
-
top: 50%;
-
}
-
.btn-fill-vert:after {
-
bottom: 50%;
-
}
-
.btn-fill-vert:hover {
-
color: #fff;
-
}
-
.btn-fill-vert:hover:before, .btn-fill-vert:hover:after {
-
height: 50%;
-
opacity: 1;
-
}
-
.btn-fill-vert.btn-red:before, .btn-fill-vert.btn-red:after {
-
background-color: #e74c3c;
-
}
-
.btn-fill-vert.btn-red:hover {
-
border-color: #e74c3c;
-
}
-
.btn-fill-horz-o {
-
background-color: transparent;
-
border: 1px solid #d0d0d0;
-
color: #B8B8B8;
-
overflow: hidden;
-
}
-
.btn-fill-horz-o:before, .btn-fill-horz-o:after {
-
content: '';
-
position: absolute;
-
top: 0;
-
width: 0;
-
height: 100%;
-
opacity: 0;
-
z-index: -1;
-
}
-
.btn-fill-horz-o:before {
-
left: 50%;
-
}
-
.btn-fill-horz-o:after {
-
right: 50%;
-
}
-
.btn-fill-horz-o:hover {
-
color: #fff;
-
}
-
.btn-fill-horz-o:hover:before, .btn-fill-horz-o:hover:after {
-
width: 50%;
-
opacity: 1;
-
}
-
.btn-fill-horz-o.btn-green:before, .btn-fill-horz-o.btn-green:after {
-
background-color: #2ecc71;
-
}
-
.btn-fill-horz-o.btn-green:hover {
-
border-color: #2ecc71;
-
}
-
.btn-fill-horz {
-
background-color: #e5e5e5;
-
border: 1px solid #e5e5e5;
-
color: #a6a6a6;
-
overflow: hidden;
-
}
-
.btn-fill-horz:before, .btn-fill-horz:after {
-
content: '';
-
position: absolute;
-
top: 0;
-
width: 0;
-
height: 100%;
-
opacity: 0;
-
z-index: -1;
-
}
-
.btn-fill-horz:before {
-
left: 50%;
-
}
-
.btn-fill-horz:after {
-
right: 50%;
-
}
-
.btn-fill-horz:hover {
-
color: #fff;
-
}
-
.btn-fill-horz:hover:before, .btn-fill-horz:hover:after {
-
width: 50%;
-
opacity: 1;
-
}
-
.btn-fill-horz.btn-blue:before, .btn-fill-horz.btn-blue:after {
-
background-color: #3498db;
-
}
-
.btn-fill-horz.btn-blue:hover {
-
border-color: #3498db;
-
}
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"笨办法"学Python
肖 (Zed A.Shaw) / 王巍巍 / 人民邮电出版社 / 2014-11-1 / CNY 49.00
本书是一本Python入门书籍,适合对计算机了解不多,没有学过编程,但对编程感兴趣的读者学习使用。这本书以习题的方式引导读者一步一步学习编程,从简单的打印一直讲到完整项目的实现,让初学者从基础的编程技术入手,最终体验到软件开发的基本过程。 本书结构非常简单,共包括52个习题,其中26个覆盖了输入/输出、变量和函数三个主题,另外26个覆盖了一些比较高级的话题,如条件判断、循环、类和对象、代码测......一起来看看 《"笨办法"学Python》 这本书的介绍吧!