<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/less">
/*
less的运算操作
我们可以在数值及颜色值上做一些基本的运算操作，注意，操作符左右最好是空格。如下
*/
@span-width:100px;
@color:#099999;
span{
height:50px;
display: inline-block;
}
#left{
width: @span-width;
background-color: @color;
}
#right{
width: @span-width * 2;
background-color: @color - 100;
}
</style>
</head>
<body>
<span id="left">
hello1
</span>
<span id="right">
hello2
</span>
<script type="text/javascript" src="js/es5-shim.js"></script>
<script type="text/javascript" src="js/less.min.js"></script>
<script type="text/javascript">
less.watch();
</script>
</body>
</html>原文：http://quietnight.blog.51cto.com/7163892/1754607