Marinerer
commented
2 years ago 自定义字典对字符串进行加解密
源自: https://github.com/wheatup/hexie-encode
```js
const _dict = ['富强', '民主', '文明', '和谐', '自由', '平等', '公正', '法治', '爱国', '敬业', '诚信', '友善'];
const encode = (src, dict = _dict) => {
dict = [...new Set(Array.isArray(dict) ? dict : [...dict])];
const decimal = dict.length - 1;
const codes = src.toString().split('').map(e => {
const code = e.charCodeAt(0);
const digits = [code % decimal];
let remainder = code;
while ((remainder /= decimal) >= 1) {
digits.unshift(remainder % decimal ^ 0);
}
return digits;
});
const result = [...codes].map((c, i) => c.map(d => dict[d]).join('') + (i < codes.length - 1 ? dict[dict.length - 1] : '')).join('');
return result;
}
const decode = (src, dict = _dict) => {
dict = [...new Set(Array.isArray(dict) ? dict : [...dict])];
const raw = dict.reduce((acc, key, index) =>
acc.replace(new RegExp(key, 'gm'), index === dict.length - 1 ? ',' : `{${index}}`), src);
const result = raw.split(',')
.map(e => /{(.+?)}/g[Symbol.match](e)
.map(e => +e.replace(/[\{\}]/g, ''))
.reduce((acc, cur, i, arr) => acc + cur * ((dict.length - 1) ** (arr.length - i - 1)), 0)
).map(e => String.fromCharCode(e)).join('');
return result
}
if (typeof module !== 'undefined') {
module.exports = {
encode,
decode
};
}
```
函数工具
记忆函数
```js function memorize(func) { const cache = new Map() return (...args) => { const key = JSON.stringify(args) if (cache.has(key)) { return cache.get(key) } const result = func(...args) cache.set(key, result) return result } } ```