如何重用样式? [英] How to reuse styles?
问题描述
过去我对CSS有很多了解,但是现在我不记得如何重用样式了。
示例:
我有一些选项卡,它们的类为 tab
,可以使用javascript进行切换。当前选择的选项卡还有另一个类,
其CSS样式:
.tab {
位置:相对;
top:0;剩余
:0;
宽度:100%;
padding:15px 0 15px 0;
边界:薄薄的#CCC;
text-align:center;
font-weight:粗体;
底边保证金:10px;
颜色:#272F42;
cursor:指针;
background-color:白色;
}
.active {
职位:相对;
top:0;剩余
:0;
padding:15px 0 15px 0;
边界:薄薄的#CCC;
text-align:center;
font-weight:粗体;
底边保证金:10px;
颜色:#272F42;
光标:默认;
background-color:#FFCF75;
}
两种样式都有很多相同的样式,除了2以外,光标
和背景色
。
所以我的问题是,我该如何重新使用.tab样式并将其用于.active吗?
我想实现以下功能:
.active {//扩展.tab
光标:默认;
background-color:#FFCF75;
}
谢谢。
您可以并且可能应该将两个类都应用于元素,如下所示:
< a class = tab active>< / a>
如果您想要针对这两个类的特定组合的css规则,则可以这样做因此:
.tab {
位置:相对;
top:0;剩余
:0;
宽度:100%;
padding:15px 0 15px 0;
边界:薄薄的#CCC;
text-align:center;
font-weight:粗体;
底边保证金:10px;
颜色:#272F42;
cursor:指针;
background-color:白色;
}
.active
{
光标:默认;
background-color:#FFCF75;
}
.tab.active / *无空格* /
{
/ *样式均为.tab和.active的元素* /
/ *保留.active可用于制表符* /
/ *以外的其他功能,并允许覆盖.tab和.active * /
}
这可以使您避免不必要地复制样式声明...并为您提供了当元素同时具有两个元素时覆盖两个单独类的特异性。 / p>
Back in the past I learned a lot about CSS but now I can't remember how to reuse styles.
Example:
I have some tabs with class tab
and I can switch them with javascript. The current selected tab has another class, active
.
Their CSS style:
.tab {
position: relative;
top: 0;
left: 0;
width: 100%;
padding: 15px 0 15px 0;
border: solid thin #CCC;
text-align: center;
font-weight: bold;
margin-bottom: 10px;
color: #272F42;
cursor: pointer;
background-color: white;
}
.active {
position: relative;
top: 0;
left: 0;
padding: 15px 0 15px 0;
border: solid thin #CCC;
text-align: center;
font-weight: bold;
margin-bottom: 10px;
color: #272F42;
cursor: default;
background-color: #FFCF75;
}
Both styles has a lot of identic styles except 2, cursor
and background-color
.
So my question is, how can I resuse the .tab style and use it in .active?
I want achieve something like this:
.active { //extends .tab
cursor: default;
background-color: #FFCF75;
}
Thanks.
You could, and probably should, apply both classes to the element like so:
<a class="tab active"></a>
If you want a css rule for the specific combination of these two classes, you'd do it like so:
.tab {
position: relative;
top: 0;
left: 0;
width: 100%;
padding: 15px 0 15px 0;
border: solid thin #CCC;
text-align: center;
font-weight: bold;
margin-bottom: 10px;
color: #272F42;
cursor: pointer;
background-color: white;
}
.active
{
cursor: default;
background-color: #FFCF75;
}
.tab.active /* no space */
{
/* styles for elements that are both .tab and .active */
/* leaving .active reusable for things other than tabs */
/* and allowing override of both .tab and .active */
}
This allows you to avoid making unnecessary copies of your style declarations... and gives you the specificity to override either of the individual classes when an element has both.
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