SOURCE

function reserve () {
    var num = window.prompt('input');
    var str = '';
    for (var i = num.length - 1; i >= 0; i--) {
        str += transfer(num[i]);
    }
    console.log(str);
}
function transfer (target) {
    switch (target) {
        case "1":
            return "一";
        case "2":
            return "二";
        case "3":
            return "三";
        case "4":
            return "四";
        case "5":
            return "五";
        case "6":
            return "六";
        case "7":
            return "七";
        case "8":
            return "八";
        case "9":
            return "九";
    }
}
reserve();