Js异步编程

hss

发布于 2022-02-25 19:04:15

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回调函数

function say(callback) {
    setTimeout(() => {
        console.log('11111')
        callback()
    }, 1000)
}
say(() => {
    console.log('2222')
})

Promise

new Promise(function (resolve, reject) {
    setTimeout(() => {
        console.log('11111')
        resolve()
    }, 1000)
}).then(() => {
    console.log('2222')
})

async/await

async function f1() {
    var res = await new Promise(function (resolve, reject) {
        setTimeout(() => {
            console.log('11111')
            resolve('2222')
        }, 1000)
    })
    console.log(res)
}
f1()

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原始发表：2020/02/24 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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