JavaScriptES6异步函数有哪些-创新互联

1

2

3

4

async function fetchdata(url){

    // Do something

    // Always returns a promise

    }

1

2

3

4

五

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

function getasync(url) { // same as original function

    return new Promise((resolve, reject) => {

        const xhr = new XMLHttpRequest()

        xhr.open("GET", url)

        xhr.onload = () => resolve(xhr.responseText)

        xhr.onerror = () => reject(xhr.statusText)

        xhr.send()

    })

}

async function fetchdata(){ // main Async function

    var text1 = await getasync('test.txt')

    console.log(text1)

    var text2 = await getasync('test2.txt')

    console.log(text2)

    var text3 = await getasync('test3.txt')

    console.log(text3)

    return "Finished"

}

fetchdata().then((msg) =>{

    console.log(msg) // logs "finished"

})