翻转数组，返回一个新数组 [5, 4, 3, 2, 1] -> [1, 2, 3, 4, 5]

function reverse(array) {

var newArray = [];

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

newArray[newArray.length] = array[i];

}

return newArray;

}

// var arr = [5, 3, 2, 1];

// console.log(reverse(arr));

var arr = ['abc', 'xyz', '123'];

console.log(reverse(arr));