js字符串加密解密

function compileStr(code) {
    var c = String.fromCharCode(code.charCodeAt(0) + code.length);
    for (var i = 1; i < code.length; i++) {
        c += String.fromCharCode(code.charCodeAt(i) + code.charCodeAt(i - 1));
    }
    return escape(c);
}

function uncompileStr(code) {
    code = unescape(code);
    var c = String.fromCharCode(code.charCodeAt(0) - code.length);
    for (var i = 1; i < code.length; i++) {
        c += String.fromCharCode(code.charCodeAt(i) - c.charCodeAt(i - 1));
    }
    return c;
}