Rewrite lib fm.js with ES6
Rewrite lib fm.js with ES6

shrekuu/douban.fm,shrekuu/douban.fm,everhopingandwaiting/douban.fm,Adai0808/douban.fm,jerrymomo10/douban.fm,Adai0808/douban.fm,everhopingandwaiting/douban.fm,jerrymomo10/douban.fm