magix-combine/plugins/util-fcache.js

合并Magix View的html,js,css成一个js文件，并检测html,js,css中可能存在的问题

module.exports = fn => {
    let cache = Object.create(null);
    return str => {
        let hit = cache[str];
        return hit || (cache[str] = fn(str));
    };
};