async...await
ES8 introduces the async function, making asynchronous operations more convenient. Simply put, it is the syntactic sugar of the Generator function.
async function asyncFunc(params) {
const result1 = await this.login()
const result2 = await this.getInfo()
}
Is it more concise and easy to understand?
Variants
Asynchronous functions exist in the following four forms of use:
- Function declaration:
async function foo() {} - Function expression:
const foo = async function() {} - The way the object:
let obj = { async foo() {} } - Arrow function:
const foo = async () => {}
Common usage summary
Handling a single asynchronous result:
async function asyncFunc() {
const result = await otherAsyncFunc();
console.log(result);
}
Process multiple asynchronous results in sequence:
async function asyncFunc() {
const result1 = await otherAsyncFunc1();
console.log(result1);
const result2 = await otherAsyncFunc2();
console.log(result2);
}
Process multiple asynchronous results in parallel:
async function asyncFunc() {
const [result1, result2] = await Promise.all([
otherAsyncFunc1(),
otherAsyncFunc2()
]);
console.log(result1, result2);
}
Handling errors:
async function asyncFunc() {
try {
await otherAsyncFunc();
} catch (err) {
console.error(err);
}
}
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