四个文件:html,less.js,demo.less,demo.css
html:
<link rel="stylesheet/less" href="css/demo.css"><script src="js/less.js"></script>demo.css:
@import "demo.less";注:1.不要直接再html引入demo.less 2.link引入rel设置成stylesheet/less两种格式3.记得引 js