javascript

2023-06-30 07:43| 来源: 网络整理| 查看: 265

sleep函数，顾名思义，等待一段时间后再执行

1，异步sleep，等待期间其他代码继续执行

function sleep(time, callback) { setTimeout(callback, time) } console.warn('sleep start') //sleep 1s sleep(1000, () => { console.log('sleep callback') }) console.warn('code end')

promise写法

function sleep (time) { return new Promise((resolve) => setTimeout(resolve, time)); } // 用法 console.warn('sleep start') sleep(3000).then(() => { console.log('sleep callback') }) console.warn('code end')

2,同步sleep，等待期间中断代码执行

function sleep (time) { return new Promise((resolve) => setTimeout(resolve, time)); } (async function() { console.warn('sleep start'); await sleep(3000); console.log('sleep callback') console.warn('code end') })();

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