js promise
时间: 2023-10-17 08:05:53 浏览: 42
JavaScript Promise是一种处理异步操作的方法。它可以将异步任务封装成一个Promise对象,并在任务完成或失败时返回结果。通过Promise,我们可以更加优雅和可读地处理异步操作,避免了回调地狱的问题。Promise有三个状态:pending、fulfilled和rejected。当Promise刚创建时,它的状态是pending,表示异步操作尚未完成。当异步操作成功完成时,Promise的状态变为fulfilled,可以通过then()方法获取到异步操作的结果。当异步操作失败时,Promise的状态变为rejected,可以通过catch()方法捕获到错误信息。通过链式调用then()方法,可以串联多个异步操作,保持代码的结构清晰。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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