console.log("欢迎来到 InsCode");
enc = ["o", "ο", "о", "ᴏ"]
console.log(encodeURI('o-ο-о-ᴏ'))
var dec = {
    'o': 0,
    'ο': 1,
    'о': 2,
    'ᴏ': 3
};
var url = "https://www.baidu.com"
// 获取utf8数组
// let unversioned = toUTF8Array(url)
//     // 转换为base 4字符串
//     // padstart非常重要！否则会丢失前导0
//     .map(n => n.toString(4).padStart(4, "0"))
//     // 转换为字符数组
//     .join("").split("")
//     // 映射到o的不同形式
//     .map(x => enc[parseInt(x)])
//     // 连接成单个字符串
//     .join("")
let unversioned = toUTF8Array(url)
// 转换为base 4字符串
let b4str = unversioned.map(n => n.toString(4).padStart(4, "0"))
console.log("转换为base 4字符串：\n", b4str)
// 转换为字符数组
let str = b4str.join("").split("")
console.log("转换为字符数组：\n", str)
// 映射到o的不同形式
let ooo = str.map(x => enc[parseInt(x)]).join("")
console.log("映射到o的不同形式：\n", ooo)

function getUrl(str) {
    // 获取url的base 4字符串表示
    let b4str = str.split("").map(x => dec[x]).join("")
    let utf8arr = []
    // 每次解析4个字符
    // 记住添加前导0的填充
    for (let i = 0; i < b4str.length; i += 4)
        utf8arr.push(parseInt(b4str.substring(i, i + 4), 4))
    // 返回解码后的字符串
    return Utf8ArrayToStr(utf8arr)
}
function toUTF8Array(str) {
    var utf8 = [];
    for (var i = 0; i < str.length; i++) {
        var charcode = str.charCodeAt(i);
        if (charcode < 0x80) utf8.push(charcode);
        else if (charcode < 0x800) {
            utf8.push(0xc0 | (charcode >> 6),
                0x80 | (charcode & 0x3f));
        }
        else if (charcode < 0xd800 || charcode >= 0xe000) {
            utf8.push(0xe0 | (charcode >> 12),
                0x80 | ((charcode >> 6) & 0x3f),
                0x80 | (charcode & 0x3f));
        }
        else {
            i++;
            charcode = ((charcode & 0x3ff) << 10) | (str.charCodeAt(i) & 0x3ff)
            utf8.push(0xf0 | (charcode >> 18),
                0x80 | ((charcode >> 12) & 0x3f),
                0x80 | ((charcode >> 6) & 0x3f),
                0x80 | (charcode & 0x3f));
        }
    }
    console.log(utf8, 'utf8');
    return utf8;
}
function Utf8ArrayToStr(array) {
    var out, i, len, c;
    var char2, char3;

    out = "";
    len = array.length;
    i = 0;
    while (i < len) {
        c = array[i++];
        switch (c >> 4) {
            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
                // 0xxxxxxx
                out += String.fromCharCode(c);
                break;
            case 12: case 13:
                // 110x xxxx   10xx xxxx
                char2 = array[i++];
                out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
                break;
            case 14:
                // 1110 xxxx  10xx xxxx  10xx xxxx
                char2 = array[i++];
                char3 = array[i++];
                out += String.fromCharCode(((c & 0x0F) << 12) |
                    ((char2 & 0x3F) << 6) |
                    ((char3 & 0x3F) << 0));
                break;
        }
    }

    return out;
}