Yuping yup9

background-image

.retina(@top: transparent, @right: transparent, @bottom: transparent, @left: transparent, @w: 1px) {
    @media only screen and (-webkit-min-device-pixel-ratio: 2),
    only screen and (min-device-pixel-ratio: 2) {
        border: none;
		 background-image:
           -webkit-linear-gradient(270deg, @top, @top 50%, transparent 50%),
           -webkit-linear-gradient(180deg, @right, @right 50%, transparent 50%),

	//from article http://www.adequatelygood.com/JavaScript-Module-Pattern-In-Depth.html
	//一.基本模式
	//
	//1. 匿名闭包 Anonymous Closures

	(function(){
	// ... all vars and functions are in this scope only
	// still maintains access to all globals
	})();