js async03
2021-04-29 16:28
标签：rom js async instant sync date after div style out
// starting slow promise at:33 js async03 标签：rom js async instant sync date after div style out 原文地址：https://www.cnblogs.com/anch/p/12200416.htmlfunction resolveAfter2Seconds() {
console.log(‘starting slow promise at:‘+ new Date().getSeconds())
return new Promise(resolve => {
setTimeout(() => {
resolve(‘slow‘)
console.log(‘slow promise is done at:‘+ new Date().getSeconds())
}, 2000 )
})
}
function resolveAfter1Second() {
console.log(‘starting fast promise at:‘+ new Date().getSeconds())
return new Promise(resolve => {
setTimeout(() => {
resolve(‘fast‘)
console.log(‘fast promise is done at:‘+ new Date().getSeconds())
}, 1000 )
})
}
const concurrentStart = async function(){
console.log(‘==CONCURRENT START WITH await == at:‘+ new Date().getSeconds())
const slow = resolveAfter2Seconds()
const fast = resolveAfter1Second()
// Executon gets here almostinstantly
console.log(await slow + ‘ at: ‘+new Date().getSeconds())
console.log(await fast + ‘ at: ‘+new Date().getSeconds())
}
concurrentStart()
starting fast promise at:33
fast promise is done at:34
slow promise is done at:35
slow at: 35
fast at: 35
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