正序

var i = 0;

var arrCopy = arr.sort();

while ( i < arrCopy.length) {

    console.log(`Hello, `+arrCopy[i]+`!`);

    i++;

}

倒序

var i = 0;

var arrCopy = arr.sort();

var arrCopy_ = arrCopy.reverse();

while ( i < arrCopy_.length) {

    console.log(`Hello, `+arrCopy_[i]+`!`);

    i++;

}