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作业

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console.log('for-正序:');

for(var i in arr){

   console.log('Hello,' + arr[i] + '!');

}

console.log('for-倒叙:');

for(var i in arr){

   arr.reverse();

   console.log('Hello,' + arr[i] + '!');

}

console.log('while-正序:');

var i = 0;

while(i < arr.length){

    console.log('Hello,' + arr[i] +'!');

    i ++;

}

console.log('while-反序:');

var i = 0;

while(i<arr.length){

     arr.reverse();

     console.log('Hello,' + arr[i] + '!');

     i++;

}


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