for (var i in arr){
console.log('Hello,'+arr[i]);
}
i = 0;
console.log('----------------')
while (i<3){
console.log('Hello,'+arr[i])；
i++;
for(i = arr.length-1;i>=0;i--){
i = 2;
while(i >=0){
i--;
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桐月的情书
for (var i in arr){
console.log('Hello,'+arr[i]);
}
i = 0;
console.log('----------------')
while (i<3){
console.log('Hello,'+arr[i])；
i++;
}
console.log('----------------')
for(i = arr.length-1;i>=0;i--){
console.log('Hello,'+arr[i]);
}
console.log('----------------')
i = 2;
while(i >=0){
console.log('Hello,'+arr[i])；
i--;
}