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第六周 循环

写出下列三个循环的输出值,并解释原因

for (var i = 0; i < 10; i++ ) {
  setTimeout(() => {
    console.log(i)
  })
}

for (var i = 0; i < 10; i++ ) {
  (function (i) {
    setTimeout(() => {
      console.log(i)
    })
  }) (i)
}

for (let i = 0; i < 10; i++ ) {
  setTimeout(() => {
    console.log(i)
  })
}

请将你的解答提在 issue 中。(title 格式:姓名 - 第x周 - JS)