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[js] 第8天 写一个加密字符串的方法#24
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@haizhilin2013

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@haizhilin2013
haizhilin2013
opened on Apr 23, 2019
Collaborator

第8天 写一个加密字符串的方法

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haizhilin2013
added
jsJavaScript
on Apr 23, 2019
linghucq1

linghucq1 commented on May 8, 2019

@linghucq1
linghucq1
on May 8, 2019
function strEncrypt(str) {
  return str.split('').map(s => {
    return String.fromCharCode(s.charCodeAt() + 1)
  }).join('')
}

console.log(strEncrypt('hello world')) // ifmmp!xpsme
myprelude

myprelude commented on Jun 13, 2019

@myprelude
myprelude
on Jun 13, 2019
escape("我是被简单的加密了") // "%u6211%u662F%u88AB%u7B80%u5355%u7684%u52A0%u5BC6%u4E86"
MartinsYong

MartinsYong commented on Jun 24, 2019

@MartinsYong
MartinsYong
on Jun 24, 2019

仅支持浏览器端：

function encode (str) {
	return btoa(encodeURIComponent(str));
}

function decode (str) {
	return decodeURIComponent(atob(str));
}

源自阮一峰《JavaScript 标准教程》

Konata9

Konata9 commented on Jul 5, 2019

@Konata9
Konata9
on Jul 5, 2019
// 利用 base64, 浏览器环境自带 btoa / atob 方法
// Node.js 需要引入相关库
const str = "abcdefg";

console.log(btoa(str));
console.log(atob(btoa(str)));

// 凯撒密码
const encodeCaesar = ({str = "", padding = 3}) =>
  !str
    ? str
    : str
        .split("")
        .map((s) => String.fromCharCode(s.charCodeAt() + padding))
        .join("");

const decodeCaesar = ({str = "", padding = 3}) =>
  !str
    ? str
    : str
        .split("")
        .map((s) => String.fromCharCode(s.charCodeAt() - padding))
        .join("");

console.log(encodeCaesar({str: "hello world"}));
console.log(decodeCaesar({str: "khoor#zruog"}));
kokokele

kokokele commented on Jul 9, 2019

@kokokele
kokokele
on Jul 9, 2019

题目应该加密和解密同时实现吧

haizhilin2013

haizhilin2013 commented on Jul 9, 2019

@haizhilin2013
haizhilin2013
on Jul 9, 2019
CollaboratorAuthor

@kokokele 你可以同时实现出来

zivenday
mentioned this on Aug 11, 2019
JJL-SH

JJL-SH commented on Sep 5, 2019

@JJL-SH
JJL-SH
on Sep 5, 2019
function encodeStr(str, key) {
  return str
    .split("")
    .map(item => {
      return item.charCodeAt() * key;
    })
    .join("#");
}
function decodeStr(str, key) {
  return str
    .split("#")
    .map(item => {
      return String.fromCharCode(+item / key);
    })
    .join("");
}

console.log(decodeStr(encodeStr("hello world", 665), 665));
pigPEQ

pigPEQ commented on Nov 8, 2019

@pigPEQ
pigPEQ
on Nov 8, 2019
//param:   method可选参数：encodeStr(加密)与decodeStr(解密)
var codeStr=(method,str)=>{
    var hit = method=='encodeStr'?'*':'/';
    return [...str].map((item)=>{
        return String.fromCharCode(eval(item.charCodeAt()+hit+10));
    }).join('');
}
console.log(codeStr('encodeStr','SDSAH'));
crazyming9528

crazyming9528 commented on Dec 20, 2019

@crazyming9528
crazyming9528
on Dec 20, 2019 · edited by crazyming9528

js生成动态密文

前端生成的密文虽然谈不上安全,但是可以用于混淆文本,防止一些参数被猜到.

特点:
每次生成的密文都不一样,解密后的文本一样

原理:
加密:
将字符串中的字符拆分成数组并将其转为字符的八进制Unicode码->反序->分割字符串->在字符串中随机加入小写字母,将分割符替换为随机大写字母

这样最终生成了 由数字/小写字母/大写字母的 动态密文

解密:
去掉小写字母->将大写字母替换为一个分割符并用分割符 拆分字符串为数组->反序->将八进制Unicode码转字符串->将数组合并成字符串

使用场景:

隐藏一些不想让用户直接看见的参数, 比如 url中的 id 等参数,cookies中的信息等

生活使用:
也可将自己常用的密码加密后保存在电脑上,避免密码被直接暴露.

//加密
function encodeStr(str) {
if (!str) return;
var random = function (lower, upper) {
return Math.floor(Math.random() * (upper - lower + 1)) + lower;
};
var arr = str.toString().split("").map(function (item) {
return item.charCodeAt(0).toString(8)
});
arr.reverse();//反序数组
arr = arr.join("").split("");//暂时使用 _ 分割字符串;
var num = 0;
while (num < str.length) {
var r = String.fromCharCode(random(97, 122));//生成用于混淆的 的 小写字母
arr.splice(random(0, arr.length), 0, r);
num++;
}
return arr.join("").replace(//ig, function (str) {
return String.fromCharCode(random(65, 90));
});//将分割符 _ 替换为随机的 大写字母

}

//解密

function decodeStr(str) {
if (!str) return;
var temp = [];
str.split("").forEach(function (item) {
var code = item.charCodeAt(0);
if (code <= 90 && code >= 65) {
item = "";//将作为分割用的 随机大写字母 统一为 _ 以便切割
temp.push(item);
}else if (code <= 57 && code >= 48) {
temp.push(item);//提取 数字
}
});
temp = temp.join("").split("");
temp.reverse();
var res = temp.map(function (item) {
return String.fromCharCode(parseInt(item, 8));
});
return res.join("");
}

https://www.crazyming.com/note/1704/

YeChang

YeChang commented on Dec 22, 2019

@YeChang
YeChang
on Dec 22, 2019
//第8天 写一个加密字符串的方法

function strEncrypt(str) {
  var sault = 3;
  return str
    .split("")
    .map(c => {
      return String.fromCharCode(c.charCodeAt(0) + sault);
    })
    .join("");
}
function strDecrypt(str) {
  var sault = 3;
  return str
    .split("")
    .map(c => {
      return String.fromCharCode(c.charCodeAt(0) - sault);
    })
    .join("");
}

var str = "hello, world";
console.log(strEncrypt(str));
console.log(strDecrypt(strEncrypt(str)));
susanforme

susanforme commented on Feb 4, 2020

@susanforme
susanforme
on Feb 4, 2020
var str="abcdqwa";
var newStr="";
function encrypt(str){
  for(var i=0;i<str.length;i++){
     newStr+=String.fromCharCode(str[i].charCodeAt()+10);
  };
  return newStr;
};
function decrypt(newStr){
  var char="";
  for(var i=0;i<newStr.length;i++){
     char+=String.fromCharCode(newStr[i].charCodeAt()-10);
  };
  return char;
}
giggleCYT

giggleCYT commented on Jun 1, 2020

@giggleCYT
giggleCYT
on Jun 1, 2020
    function fn(str) {
        return str.replace(/\w/g, (s) => {
            var code = s.charCodeAt();
            if (code <= 77) {
                return String.fromCharCode(code + 13);
            } else {
                return String.fromCharCode(code - 13);
            }
        })
    }
    console.log(fn("my family"));//`l YT`\_l
timeyo

timeyo commented on Jun 1, 2020

@timeyo
timeyo
on Jun 1, 2020
    function fn(str) {
        return str.replace(/\w/g, (s) => {
            var code = s.charCodeAt();
            if (code <= 77) {
                return String.fromCharCode(code + 13);
            } else {
                return String.fromCharCode(code - 13);
            }
        })
    }
    console.log(fn("my family"));//`l YT`\_l

这么搞你怎么解密

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          [js] 第8天 写一个加密字符串的方法 · Issue #24 · haizlin/fe-interview