js async04
2021-04-29 16:26
标签：return promise messages gets time ESS mis ntp sync
// CONSURRENT START WITH promise at: 42 js async04 标签：return promise messages gets time ESS mis ntp sync 原文地址：https://www.cnblogs.com/anch/p/12200423.htmlfunction resolveAfter2Seconds() {
console.log(‘slow start at: ‘ + new Date().getSeconds())
return new Promise(resolve => {
setTimeout(() => {
resolve(‘slow‘)
console.log(‘slow done at: ‘ + new Date().getSeconds())
}, 2000 )
})
}
function resolveAfter1Second() {
console.log(‘fast start at: ‘ + new Date().getSeconds())
return new Promise(resolve => {
setTimeout(() => {
resolve(‘fast‘)
console.log(‘fast done at: ‘ + new Date().getSeconds())
}, 1000 )
})
}
const concurrentPromise = function() {
console.log(‘CONSURRENT START WITH promise at: ‘ + new Date().getSeconds())
return Promise.all([resolveAfter2Seconds(), resolveAfter1Second()]).then(messages => {
console.log(messages[0] + ‘ at: ‘ + new Date().getSeconds())
console.log(messages[1] + ‘ at: ‘ + new Date().getSeconds())
})
}
concurrentPromise()
slow start at: 42
fast start at: 42
fast done at: 43
slow done at: 44
slow at: 44
fast at: 44
下一篇：js async01