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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。