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HomeWeb Front-endHTML TutorialCss基本样式――――背景_html/css_WEB-ITnose

一、CSS允许应用纯色作为背景,也允许使用背景图像创建相当复杂的效果

二、属性:

    background-color    设置元素的背景颜色

body{    background-color: darkgray;}<p>测试一下背景是否可以继承</p>

background-color这个属性是不可以被继承的

p{    background-color: aqua;}

这时候可以看到p元素加上了一个背景颜色,但是这个时候背景颜色比较长,它已经超出了文字的范围,要想修改的话只能在css样式来进行修改,修改它整个p标签的宽度

p{    width: 150px;    background-color: aqua;}

现在可以看到p标签宽度被修改后的效果,但是这个时候的背景颜色有点窄,那么可以通过一个padding属性给它增宽

p{    width: 150px;    padding: 10px;    background-color: aqua;}

    background-image    把图片设置为背景

body{    background-image: url("1.jpg");}

也可以单独地给一个标签加上背景颜色

p{    background-image: url("1.jpg");}

    background-position    设置背景图片的起始位置

body{    background-image: url("1.jpg");    background-repeat: no-repeat;    background-position: right;}

这时候背景图片跑到了右边并且图片只剩下一半了

其实这个属性很少单独出现,我们看到的是一个right,其实它是出现了两个属性

right代表的是“right”和“center”

right代表的是图片所处的当前视图的位置

center是代表当前图片要显示的位置(即图片从中间开始显示)

这个时候可以对background-position属性值做一下修改

background-position: right top;

这时候代表背景图片在视图的右侧显示,从图片的顶部开始(可以看到全面显示的效果)

也可以在background-position内添加具体的数值

background-position: 0px 0px;

这时候代表从左上角(0,0)点开始

很多时候用数值来确定它的位置会方便一些

也可以用百分数来确定它的位置

    background-attachment    背景图像是否固定或者随着页面的其余部分滚动

body{    background-image: url("1.jpg");    background-repeat: no-repeat;    background-attachment: fixed;}

默认情况下背景图片随着页面滚动

这里把background-attachment属性设置为不随着页面滚动

    background-repeat    设置背景图片是否及如何重复

这里在前面已经使用到了


三、CSS3背景

    background-size    规定背景图片的尺寸

body{    background-image: url("1.jpg");    background-repeat: no-repeat;    background-size: 600px 600px;}

    background-origin    规定背景图片的定位区域

    background-clip    规定背景的绘制区域



    

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