https://github.com/JacksonTian/eventproxy
https://github.com/asyncly/EventEmitter2
https://github.com/caolan/async
Promise (有bluebird/q.js等第三方實現)
await async
function * yield
https://github.com/tj/co
https://github.com/JacksonTian/eventproxy
https://github.com/asyncly/EventEmitter2
https://github.com/caolan/async
Promise (有bluebird/q.js等第三方實現)
await async
function * yield
https://github.com/tj/co
.main{ position: absolute; width: 1200px; left:50%; margin-left:-600px; } 絕對定位absolute,可以用left