var arr = ['Bart', 'Lisa', 'Adam'];

console.log('---for正序----');

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

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

}

console.log('\n---for倒序----');

for(var i=arr.length-1;i>=0;i--){

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

}

console.log('\n---while正序----');

var i=0;

while(i<=arr.length-1){

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

i++;

}

console.log('\n---while倒序----');

var i=arr.length-1;

while(i>=0){

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

i--;

}