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                [TOC] ## 1.同步和異步的區別,分別舉一個例子 ``` 同步會阻塞代碼執行,異步不會 alert是同步,setTimeOut是異步 ``` ### setTimeout ``` console.log(1) setTimeout(() => { console.log(2) }, 0); console.log(3) setTimeout(() => { console.log(4) }, 1000); console.log(5) ``` ### alert ``` console.log(100) alert(200) //1秒后點擊確定 console.log(300) ```
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