循环中的循环

循环中套循环？！🤯

外层与内层 🪆

第一个嵌套循环 🔁

for (let i = 1; i <= 2; i++) {
  for (let j = 1; j <= 3; j++) {
    console.log('i=' + i + ' j=' + j)
  }
}

两个计数器！✌️

for (let i = 1; i <= 2; i++) {
  console.log('Outer ' + i + ' starts')
  for (let j = 1; j <= 2; j++) {
    console.log('  inner ' + j)
  }
}

总共运行多少次？🔢

let count = 0
for (let i = 1; i <= 3; i++) {
  for (let j = 1; j <= 4; j++) {
    count = count + 1
  }
}
console.log('Total runs: ' + count)

日子与餐食 🍽️

for (let day = 1; day <= 2; day++) {
  console.log('Day ' + day)
  for (let meal = 1; meal <= 3; meal++) {
    console.log('  meal ' + meal)
  }
}

行中的星星 ⭐

for (let row = 1; row <= 3; row++) {
  for (let s = 1; s <= 2; s++) {
    console.log('star')
  }
  console.log('--- end of row ---')
}

顺序很重要 📋

for (let i = 1; i <= 2; i++) {
  for (let j = 1; j <= 2; j++) {
    console.log(i + ',' + j)
  }
}

数字相乘 ✖️

for (let i = 1; i <= 2; i++) {
  for (let j = 1; j <= 3; j++) {
    console.log(i + ' x ' + j + ' = ' + (i * j))
  }
}

搭配服装 👕👖

for (let shirt = 1; shirt <= 2; shirt++) {
  for (let pants = 1; pants <= 2; pants++) {
    console.log('Shirt ' + shirt + ' with pants ' + pants)
  }
}

轮到您嵌套了 🌟

for (let i = 1; i <= 2; i++) {
  for (let j = 1; j <= 4; j++) {
    console.log('i=' + i + ' j=' + j)
  }
}

快速检查 ✅

嵌套循环回顾 🎉