使用 async/await 未解决 Promise [英] Promise is not resolved using async/await
本文介绍了使用 async/await 未解决 Promise的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试学习 async/await of promise 我已经创建了演示代码
I am trying to learn async/ await of promise I have created demo code
<html>
<head>
<script>
async function getTested() {
alert("line");
let pp = await test1();
alert(pp); //expected to print hello
}
async function test1 () {
alert("line 9");
let promise = await test2();
alert(promise); //expected to print hello
return promise;
}
function test2 () {
alert("line 15");
let promise = new Promise.resolve('hello');
alert(promise);
return promise;
}
</script>
</head>
<body onload="getTested()"></body>
</html>这里我使用 async/await 来解决我在 test1 和 getTested 中打印hello"的承诺.我在这里做什么错了?
Here I used async/await to resolve the promise I excepted it to print 'hello' in test1 and getTested. What is wrong I am doing here?
推荐答案
new Promise.resolve <- 有问题.
初始化并返回 Promise 对象.
Initialize and return the Promise object.
let promise = new Promise(function(r) {
r("hello");
});
或者，您可以采用与您想采用的方法类似的方法:
Or, you can follow an approach similar as you wanted to follow:
Promise.resolve("hello");
async function getTested() {
let pp = await test1();
console.log(pp); //expected to print hello
}
async function test1() {
let promise = await test2();
console.log(promise); //expected to print hello
return promise;
}
function test2() {
return Promise.resolve("hello");
}
getTested()这篇关于使用 async/await 未解决 Promise的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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