一.准备过程
文件夹如图所示
html代码如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="./css/text.css">
</head>
<body>
</body>
</html>
我们在text.less文件中写好样式以后将文件夹拖到koala编译,这样它会自动在css文件夹中新建一个css文件,所以我们引入的必须是css文件。
二.less重点功能介绍
1.变量/variables
html代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="./css/text.css">
</head>
<body>
<header>头部</header>
</body>
</html>
less代码:
body {
padding: 0;
margin: 0;
}
/*下面定义一个变量,less定义变量以@开头,后面跟着变量名*/
@header-height: 60px;
header {
height: @header-height;
}
2.混入/Mixins
html代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="./css/text.css">
</head>
<body>
<div class="left">1</div>
<div class="right">2</div>
</body>
</html>
css代码:
body {
padding: 0;
margin: 0;
}
div {
width: 100px;
height: 100px;
font-size: 25px;
}
/*下面写一个混入的样式*/
.fl {
float: left;
}
.fr {
float: right;
}
.left {
.fl();
background-color: red;
}
.right {
.fr();
background-color: green;
}
3.参数混合/Parametric Mixins
html代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="./css/text.css">
</head>
<body>
<div>1</div>
</body>
</html>
less代码:
body {
padding: 0;
margin: 0;
}
div {
width: 100px;
height: 100px;
font-size: 25px;
background-color: green;
margin: 10px auto;
}
/*下面写一个参数混合的样式*/
.border-radius(@radius) {
border-radius: @radius;
}
div {
.border-radius(15px);
}
4.参数逻辑条件混合/Mixin Guards
html代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="./css/text.css">
</head>
<body>
<div class="one">第一个</div>
<div class="two">第二个</div>
<div class="three">第三个</div>
</body>
</html>
less代码:
body {
padding: 0;
margin: 0;
}
/*参数逻辑条件混合Mixin_Guards*/
#ft-size(@name) when(@name=small) {
font-size: 10px;
}
#ft-size(@name) when(@name=medium) {
font-size: 20px;
}
#ft-size(@name) when(@name=big) {
font-size: 30px;
}
.one {
#ft-size(small);
}
.two {
#ft-size(medium);
}
.three {
#ft-size(big);
}
5.嵌套规则/Nesting
html代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="./css/text.css">
</head>
<body>
<header>
<div>
<div class="one">this is one</div>
</div>
</header>
</body>
</html>
less代码:
body {
padding: 0;
margin: 0;
}
/*引用*/
header {
width: 800px;
height: 500px;
border: 1px solid red;
div {
width: 400px;
height: 100px;
margin: 20px auto;
border: 1px solid green;
.one {
color: red;
font-size: 50px;
/*&指当前目录下,即header div .one*/
&:hover {
color:green;
}
}
}
}