Update async.md

Refer to your previous blog post, it looks better.
http://www.ruanyifeng.com/blog/2012/12/asynchronous%EF%BC%BFjavascript.html
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catwarrior
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# 异步操作和Async函数
异步编程对JavaScript语言太重要。JavaScript只有一根线程,如果没有异步编程,根本没法用,非卡死不可。
异步编程对JavaScript语言太重要。Javascript语言的执行环境是“单线程”的,如果没有异步编程,根本没法用,非卡死不可。
ES6诞生以前,异步编程的方法,大概有下面四种。