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promise一共有三种状态:fulfilled(异步操作成功),rejected(异步操作失败),pending(异步操作未完成)。 通过catch捕获到reject之后,在catch后面可以继续执行then方法,catch返回的是一个新的promise实例,执行的是then方法的第一个回调函数。
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The text was updated successfully, but these errors were encountered: