trycatch和await
时间: 2023-10-26 22:22:38 浏览: 97
try-catch用法
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try/catch和await都是用于处理异步操作中的错误的机制。try/catch语句块用于捕获同步代码中的异常,并提供处理这些异常的机会。它可以捕获和处理try代码块中的错误,并在发生异常时执行catch代码块。而await关键字则用于等待一个Promise对象的处理完成,并将其结果作为表达式的值返回。在异步函数中使用await关键字可以暂停函数的执行,直到Promise对象被解析或拒绝。如果Promise对象被成功解析,await表达式会返回resolve函数的参数值,如果Promise对象被拒绝,await表达式会抛出Promise的异常原因。所以,try/catch和await都是在处理异步操作中的错误时非常有用的机制。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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