利用requestjs优化响应式移动端js加载

html：

<script data-main="main" src="require.js"></script>

main.js

require.config({
    baseUrl: 'js',
    shim: {
        "zepto": {
            exports: "$"
        }
    }
});
if(/AppleWebKit.*Mobile/i.test(navigator.userAgent)
    || /Android/i.test(navigator.userAgent)
    || /BlackBerry/i.test(navigator.userAgent)
    || /IEMobile/i.test(navigator.userAgent)
    || (/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))){
    /*if(/iPad/i.test(navigator.userAgent)){alert("iPad平板");}else{alert("其他移动设备 www.111cn.net ");}*/
    require(['zepto'],function($){
    })
}else{
    require(['jquery'],function($){
    })
}

目录结构：