(window.$ = Zepto);
;(function($) {
function detect(ua) {
var os = this.os = {}, browser = this.browser = {},
webkit = ua.match(/WebKit\/([\d.]+)/),
android = ua.match(/(Android)\s+([\d.]+)/),
ipad = ua.match(/(iPad).*OS\s([\d_]+)/),
iphone = !ipad && ua.match(/(iPhone\sOS)\s([\d_]+)/),
webos = ua.match(/(webOS
关键词：zepto是啥