XingGuoZM
commented
1 year ago 写一个方法把0和1互转（0置1，1置0）
const convert = num=>num^1;写一个加密（解密）字符串的方法
//加密
function encryptStr (str, key) {
let ans = '', b, b1, b2, b3;
const len = key.length;
for (let i = 0; i < str.length; i++) {
b = str.charCodeAt(i);
b1 = b % len;
b = (b - b1) / len;
b2 = b % len;
b = (b - b2) / len;
b3 = b % len;
ans += key[b1] + key[b2] + key[b3];
}
return ans;
}
// 解密
function decryptStr (str, key) {
const keyLen = key.length;
const ansLen = Math.floor(str.length / 3);
let ans = new Array(ansLen), b1, b2, b3, d = 0;
for (let i = 0; i < ansLen; i++) {
b1 = key.indexOf(str.charAt(d++));
b2 = key.indexOf(str.charAt(d++));
b3 = key.indexOf(str.charAt(d++));
ans[i] = b1 + b2 * keyLen + b3 * keyLen * keyLen;
}
return String.fromCharCode(...ans);
}
const key = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const str = '¥'
const s1 = encryptStr(str, key)
const s2 = decryptStr(s1, key)
console.log(s1, s2)实现颜色转换 'rgb(255, 255, 255)' -> '#FFFFFF' 的互转
// 'rgb(255, 255, 255)' -> '#FFFFFF'
const rgb2hex=(rgb)=>{
const rgbList = rgb.match(/\d+/g);
const hex = (n) => {
return ("0" + Number(n).toString(16)).slice(-2);
}
return rgbList.reduce((pre,cur)=>pre+hex(cur),'#').toUpperCase()
}
// '#FFFFFF' -> 'rgb(255, 255, 255)'
const hex2rgb=(hex)=>{
const ret = [];
for(let i = 1; i < hex.length; i+=2) {
const str = `0x${String(hex[i])}${String(hex[i+1])}`;
ret.push(parseInt(str));
}
return `rgb(${ret.join(',')})`;
}
//测试
console.log(rgb2hex('rgb(255,255,255)'));
console.log(hex2rgb('#000000'));写一个方法，实现中划线命名和小驼峰命名互转
// 命名方式中划线改小驼峰
const format2Camel = function (str) {
return str.replace(/-[a-zA-Z]/g, match => match.replace('-', '').toUpperCase())
}
// 命名方式小驼峰改中划线
const format2Line = function (str) {
return str.replace(/[A-Z]/g, match => '-' + match.toLowerCase());
}写一个汉字与Unicode码的互转的方法
// 汉字 -> unicode编码
function str2Unicode (str) {
let result = ''
for (let i = 0; i < str.length; i++) {
result += `&#${str.charCodeAt(i)};`;
}
return result;
}
// unicode编码串 -> 汉字
function unicode2Str (unicode) {
const code = unicode.match(/&#(\d+);/g);
let result = '';
for (let i = 0; i < code.length; i++) {
result += String.fromCharCode(code[i].replace(/[&#;]/g, ''))
}
return result;
}实现阿拉伯数字和中文数字互转，例如：101转成一百零一、一百零一转成101
function NumberConvert () {
this.NumberMap = '零一二三四五六七八九';
this.UnitMap = {
'十': 10,
'百': 100,
'千': 1000,
'万': 10000,
'亿': 100000000
}
this.ChinaUnit = [''
, '十', '百', '千', '万'
, '十', '百', '千', '亿'
, '十', '百', '千', '万'
, '十', '百', '千', '亿'
];
//
this.arabic2China = function (num) {
if (!num || isNaN(num)) {
return "零";
}
const str = String(num);
const len = str.length;
let result = "";
for (let i = 0; i < len; i++) {
// 反向映射数字
const number = this.NumberMap[str[len - 1 - i]];
// 正向映射单位
const unit = this.ChinaUnit[i];
result = number + unit + result;
}
return result
.replace(/零(千|百|十)/g, '零')
.replace(/十零/g, '十')
.replace(/零+/g, '零')
.replace(/零亿/g, '亿')
.replace(/零万/g, '万')
.replace(/亿万/g, '亿')
.replace(/零+$/, '')
.replace(/^一十/g, '十');
}
this._transform = function (str) {
if (!str) return 0;
const stack = [];
for (let i = 0; i < str.length; i++) {
const n = this.NumberMap.indexOf(str[i]);
const u = this.UnitMap[str[i]];
if (n >= 0) stack.push(n)
if (u >= 0) stack.push((stack.pop()) * u)
}
return stack.reduce((acc, item) => acc + item, 0);
}
this._format = function (str) {
return str[0] === '十' ? `一${str}` : str
};
this.china2Arabic = function (str) {
const splitChar = ['亿', '万'];
let s = str;
for (const char of splitChar) {
const arr = s.split(char);
if (arr.length === 2) {
return this._transform(this._format(arr[0])) * this.UnitMap[char] + this.china2Arabic(arr[1]);
}
s = arr[0];
}
return this._transform(this._format(s));
}
}
// 测试
const convert = new NumberConvert();
const s = convert.arabic2China(8)
const n = convert.china2Arabic(s);
console.log(s, n)
字符串常见方法实现