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                目錄 (づ ̄ 3 ̄)づ=> [TOC] ## process.nextTick > tick即為時鐘滴答一聲 tick會加入到**當前隊列**的底部(同步代碼的底部) ``` process.nextTick(()=>{ console.log('tick'); }); ``` ## setTimeout/setInterval > 同瀏覽器中的方法 加入到異步隊列,間隔相同時,誰先加入先執行誰 ## setImmediate > immediate:立即,馬上 會加入到**異步隊列**中的頂部(若不存在setTimeout/setInterval觸發間隔設置為0的情況(此時有很大幾率比immediate快),否則排列在其之后) >[warning] 3種類定時器方法的執行順序為(從先到后):nextTick>setTimeout(為0時)/setInterval(為0時) >setImmediate>setTimeout/setInterval ## Promise > 許諾 是一種異步操作,通常為網絡請求或讀取本地文件等。 ``` //創建Promise對象,并傳入executor函數決定在什么時候將pending狀態改變成resolved/rejected狀態 let p1 = new Promise((resolve,reject)=>{ ... }); //設定回調 p1.then(function(){ //若異步方法順利執行執行此函數 },function(){ //若異步方法拒絕執行執行此函數 }) ```
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