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我们如何判断一个方法是同步的还是异步的，是否只要有回调函数就是异步?
比如react setState是同步还是异步，setTimeout是同步还是异步，console.log呢？ 你自己怎么写一个异步的方法？
ps: 上面的很多都是伪问题， 你能看出来我问的有问题么？