在线转换工具https://oktools.net/unicode

Unicode转中文

    function decodeUnicode(str) {
       return unescape(str.replace(/\\u/gi, '%u'))
    }

中文转Unicode

    function encodeUnicode(str) {
        let res = [];
        for (let i = 0; i < str.length; i++) {
            res[i] = ("00" + str.charCodeAt(i).toString(16)).slice(-4);
        }
        return  "\\u" + res.join("\\u");
    }

Ascii 转 Unicode

function A2U(str) {
    var reserved = '';

    for (var i = 0; i < str.length; i++) {
        reserved += '&#' + str.charCodeAt(i) + ';';
    }

    return reserved;
}

Unicode 转 Ascii

function U2A(str) {
    var reserved = '';
    var code = str.match(/&#(d+);/g);

    if (code === null) {
        return str;
    }

    for (var i = 0; i < code.length; i++) {
        reserved += String.fromCharCode(code[i].replace(/[&#;]/g, ''));
    }

    return reserved;
}