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交作业!

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for正序、倒序循环遍历

for(var i = 0;i<arr.length;i++)

{

  console.log(`Hello,${arr[i]}`);

}

arr.sort();

for(var x in arr)

{

  console.log('Hello,'+arr[x]);

}

arr.sort();//让数组返回正序

while正序、倒序循环遍历

var y = 0;

while(y<arr.length)

{

  console.log(`Hello,${arr[y]}`);

  y++;

}

var z = arr.length-1;

while(z>=0)

{

  console.log('Hello,'+arr[z]);

  z--;

}


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