Css3 calc可使用简单的数学运算计算宽度_html/css_WEB-ITnose
Css3 calc可使用简单的数学运算计算宽度
calc是单词calculate的缩写,是Css3的一个新的长度单位函数,可以使用简单的数学运算.
Firefox要使用-moz-calc()私有属性,
Chrome要使用-webkit-calc()私有属性,
IE9原生支持标准的不带前缀的写法,
Opera暂还不支持.
运算规则
可以使用 “+” “-” “*” “/” 四则运算(”+”、”-”两个符号边上必须要有空格,而”*”、”/”符号则不是必须的),
可以使用百分比、px、em、rem等单位,
可以混合使用各种单位进行计算.
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.content {
border:1px solid #000;
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(100% - 2px);
}
.content2 {
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(10em + 10px);
}
/*三栏等宽布局*/
.content3 {
margin-left:20px;
/* ‘+’ ‘-’ 符号左右两边加空格, ‘*’ ‘/’ 符号可不加 */
width:calc(100%/3 - 20px);
}
/* n为从0开始的乘数,依次递增1,如:3*0,3*1,3*2等相乘结果后的子元素 */
.content3:nth-child(3n){
margin-left:0;
}
calc是单词calculate的缩写,是Css3的一个新的长度单位函数,可以使用简单的数学运算.
Firefox要使用-moz-calc()私有属性,
Chrome要使用-webkit-calc()私有属性,
IE9原生支持标准的不带前缀的写法,
Opera暂还不支持.
运算规则
可以使用 “+” “-” “*” “/” 四则运算(”+”、”-”两个符号边上必须要有空格,而”*”、”/”符号则不是必须的),
可以使用百分比、px、em、rem等单位,
可以混合使用各种单位进行计算.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
.content {
border:1px solid #000;
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(100% - 2px);
}
.content2 {
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(10em + 10px);
}
/*三栏等宽布局*/
.content3 {
margin-left:20px;
/* ‘+’ ‘-’ 符号左右两边加空格, ‘*’ ‘/’ 符号可不加 */
width:calc(100%/3 - 20px);
}
/* n为从0开始的乘数,依次递增1,如:3*0,3*1,3*2等相乘结果后的子元素 */
.content3:nth-child(3n){
margin-left:0;
}

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