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关于 let 执行结果 #20

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MaMaFish opened this issue Mar 12, 2020 · 0 comments

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MaMaFish commented Mar 12, 2020 •

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for(var i=0; i<10; i++){
    setTimeout(function(){
        console.log(i) // 连续打印 10 个 10
    },200)
}

将 var 换成 let

for(let i=0; i<10; i++){
    setTimeout(function(){
        console.log(i) // 依次打印 0 到 9
    },200)
}

声明自执行函数

for(let i=0; i<10; i++){
    ((j)=>{
        setTimeout(function(){
            console.log(j) // 依次打印 0 到 9
        },200)
    })(i)
}

MaMaFish changed the title ~~第20题：关于let执行结果~~ 关于 let 执行结果

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